20 Healthy Foods & Supplements That Can Cause Surprising Side Effects

Could Your Healthy Habit Be Causing Your Symptoms?

You started taking magnesium to sleep better. You switched to a chicory-root coffee because you wanted a healthier morning routine and ditch the caffeine. You added a probiotic for your gut. You started taking iron because you've been exhausted. And then something strange happened. You became bloated. Constipated. Gassy. Nauseated. Groggy. Your stomach started acting up. Or you developed tingling in your hands and feet.

Could one of your new “healthy” habits be contributing to these symptoms?

Absolutely — sometimes. However, that doesn't mean the food or supplement is bad. It means that something that is beneficial, appropriate, or well tolerated by one person may cause unwanted effects in another. Dose, formulation, individual sensitivity, medications, and underlying digestive issues can all make a difference.

And some of the culprits aren't obvious because they are hiding in products marketed as healthy.

Here are some of the most common ones worth knowing about.

First: Healthy Doesn't Mean Side-Effect-Free

There is an important distinction between a food naturally containing a nutrient and taking a concentrated supplement containing that nutrient.

For example, consuming vitamin C from strawberries and peppers is not the same thing as taking several thousand milligrams of vitamin C in a supplement. Likewise, eating turmeric in food is very different from taking a concentrated curcumin product designed to increase absorption.

The body still has to deal with the substance — and more isn't necessarily better.

This is particularly relevant in midlife, when women may start adding several supplements at once for sleep, energy, bone health, digestion, cholesterol, weight management, hair, skin, or other menopause symptoms. Changing your routine with multiple supplements or new foods along with midlife changes can can make it surprisingly difficult to figure out what's causing what.

If you're not sure whether a supplement is actually helping or causing a new symptom, tracking what you're taking alongside your symptoms can help you spot patterns that are otherwise easy to miss. Our Menopause Symptom Trackers include diaries for symptoms, food, sleep, headaches, hot flashes, mood, and more — so you can start documenting what's happening before your next appointment.

“But It Works Great for My Friend!”

We've all been there. Your friend swears that magnesium fixed her sleep. Your sister says a probiotic completely transformed her digestion. Someone at work says berberine helped her lose weight. Your neighbor insists that turmeric made her joints feel fantastic. So you try it, but instead of sleeping better, you have diarrhea. Instead of a calmer stomach, you're bloated. Instead of feeling more energetic, you're nauseated — or just feel completely different from what your friend described.

What's going on?

Your friend wasn't necessarily wrong. And you aren't necessarily doing anything wrong either. The same supplement can affect two people very differently. Your friend may be taking a different dose, a different formulation, or a different brand. She may have a different diet, different gut bacteria, different medications, different underlying health conditions, or simply a different level of sensitivity. Unfortunately, sometimes a supplement really does help one symptom while creating another.

Maybe magnesium helps your friend sleep but gives you diarrhea. Maybe fiber helps someone else with constipation but leaves you painfully bloated. Maybe melatonin helps your friend fall asleep but leaves you groggy the next morning.

That's why “It worked for me!” isn't the same thing as “It will work for you.”

It's also why adding more supplements every time you develop a new symptom can become a frustrating cycle. The goal isn't to find the supplement that everyone on the internet swears by. The goal is to figure out what your body actually tolerates, what you actually need, and whether the benefit is worth any unwanted side effects.

If bloating, gas, constipation, or diarrhea seems to have appeared out of nowhere, dive into our Gut Health articles that can help you look beyond supplements and consider the many factors that can affect your digestion during peri/menopause.

If you're looking for supplements that may help with menopause symptoms rather than trying to figure out what's causing a new one, start with our guide to 15 Supplements for Menopause Symptom Relief. It covers commonly used supplements such as black cohosh, soy isoflavones, magnesium, vitamin D, and probiotics — along with what the research actually says about their potential benefits.

1. Inulin and Chicory Root: The “Healthy Coffee” That Makes You Bloated

Chicory root has become a popular ingredient in coffee alternatives and “better-for-you” beverages. It is also used as a source of inulin, a prebiotic fiber.

Prebiotic fibers can be beneficial because they are fermented by gut bacteria. The problem is that fermentation can also produce gas. For some people — particularly people with IBS or sensitivity to FODMAPs (sugars that aren’t absorbed properly in the gut)— ingredients such as inulin, chicory root, chicory root fiber, and fructooligosaccharides (FOS) can cause:

• Gas
• Bloating
• Abdominal distension
• Abdominal discomfort

The Monash FODMAP specifically identifies chicory and inulin as ingredients that ferment rapidly in the gut, causing gas, bloating, abdominal distension, and abdominal pain in sensitive individuals. So if your new chicory coffee coincided with a new case of “why am I suddenly so bloated?”, check the ingredient list — look for: inulin, chicory root, chicory root fiber, chicory extract, FOS, and fructans.

And remember: a prebiotic isn't necessarily a bad thing. It may simply be a bad match for your gut at that dose.

2. Magnesium: Great for Some Things, Rough on Some Stomachs

Magnesium is one of the most popular supplements in midlife. It's commonly taken for sleep, muscle cramps, constipation, headaches, or simply because magnesium is considered an important nutrient. But supplemental magnesium can sometimes cause:

• Diarrhea
• Nausea
• Abdominal cramping

The form and dose matter, too.

The NIH Office of Dietary Supplements sets an upper limit of 350 mg per day of magnesium from supplements and medications for adults , unless a healthcare professional recommends otherwise. This limit does not include magnesium naturally present in food.

If magnesium seems to be turning your digestive tract into a water slide, don't automatically assume you need to stop magnesium altogether. The amount, formulation, timing, and reason you're taking it are worth discussing with a healthcare professional.

3. Calcium: The Bone-Health Supplement That Can Slow Your Gut

Calcium is especially relevant for women in midlife because bone health becomes increasingly important. However, calcium supplements can have an annoying downside: constipation, gas, and bloating can occur. This can create a frustrating situation if you're taking calcium because you're trying to protect your bones while simultaneously wondering why your digestion has changed.

If you take calcium, consider how much you're getting from food as well as supplements. More isn't automatically better.

Calcium is calcium, right? Not always. Different calcium supplements share common mild stomach side effects, but calcium carbonate tends to cause more frequent constipation, gas, and bloating than calcium citrate. Remember — the formulation and dose can matter.

If you're taking calcium, magnesium, or other supplements specifically to protect your bones as estrogen declines, see our articles on Bone Health for a bigger-picture look at what actually supports bone strength in midlife.

4. Iron: Helpful When You Need It — Miserable When You Don't Tolerate It

Iron deficiency can cause fatigue, weakness and other symptoms, so iron supplementation can be very important when a deficiency has actually been identified. However, iron supplements are notorious for causing GI side effects.

High doses can cause:

• Constipation
• Nausea
• Abdominal pain
• Stomach upset
• Vomiting
• Diarrhea

The NIH notes that these effects can be particularly problematic with higher doses and when iron is taken on an empty stomach; however, it’s not a reason to stop prescribed iron. It is a reason to tell your healthcare professional if iron is making you miserable. The dose, formulation, timing, or treatment plan may need to be adjusted.

If you're taking iron because you're tired but haven't had your iron status checked, that's worth discussing before simply adding more.

5. Vitamin C: More Can Mean More Bathroom Trips

Vitamin C has an excellent health halo. It's associated with immunity, collagen production, antioxidant activity, and iron absorption.

Large supplemental doses can cause:

• Diarrhea
• Nausea
• Abdominal cramps
• Other GI upset

The NIH notes that these effects are related in part to unabsorbed vitamin C drawing water into the gastrointestinal tract. In other words, if you started taking a high-dose vitamin C supplement and suddenly developed loose stools, the supplement deserves a spot on your suspect list.

Food sources are a different story. Fruits and vegetables provide vitamin C along with fiber and other nutrients and generally aren't delivering the concentrated doses found in supplements.

6. Zinc: The Immune Supplement That Can Make You Nauseated

Zinc is another supplement people reach for when they want to support immunity, skin, hair, or general health.

Too much supplemental zinc can cause:

• Nausea
• Stomach upset
• Vomiting
• Loss of appetite
• Headaches
• Dizziness

The NIH also warns that taking high doses of zinc for weeks can interfere with copper absorption. It’s also worth noting that zinc may be hiding in more than one product. You might take a multivitamin, an immune supplement, and a “hair, skin & nails” product without realizing that you're stacking zinc. Check the total amount across all your supplements.

7. Vitamin B6: When “Energy” Supplements Become a Nerve Problem

Vitamin B6 is found in multivitamins, B-complex products, energy supplements, and many products marketed for general wellness. Your body needs B6 — but more isn't better.

Long-term excessive supplemental B6 can cause peripheral neuropathy, which can feel like:

• Tingling
• Numbness
• Burning
• Pins and needles
• Changes in sensation

This is an especially important one to remember because someone taking multiple supplements may not realize they're getting B6 from several different products.

If you develop unexplained tingling or numbness, don't automatically assume it's aging, menopause, or a pinched nerve. Review your supplements with your healthcare professional.

If fatigue is the reason you're reaching for vitamins or supplements, take a look at our articles on menopausal sleep and fatigue before assuming you simply need more of a particular nutrient.

8. Biotin: The Hair-and-Nail Supplement That Can Mess With Blood Tests

Biotin has a particularly interesting place on the “healthy supplement” list because the problem isn't usually that biotin makes you feel sick. It's that taking more than you need can interfere with certain blood tests — potentially making your lab results look different from what is actually happening in your body.

Biotin is commonly marketed for hair, skin, and nails, which makes it especially tempting when you're dealing with hair thinning or changes in your nails during midlife. The catch is that many beauty supplements contain doses of biotin far higher than the amount most people need from their diet. And because biotin is water-soluble and generally considered safe, it's easy to assume that taking extra is harmless.

But biotin can interfere with laboratory tests that use biotin-streptavidin technology. Depending on the particular test, that interference can make a result appear falsely high or falsely low. Thyroid testing is one example, which is particularly relevant if you're already trying to figure out whether symptoms such as fatigue, hair changes, or weight changes are related to menopause, thyroid disease, or something else.

That creates an interesting situation: the supplement you're taking to improve your hair could potentially complicate the blood work being used to investigate your symptoms. You may not feel any different from taking biotin, yet the lab result your healthcare provider sees may not accurately reflect what's happening in your body.

If you're taking a high-dose biotin supplement, especially one marketed for hair, skin, and nails, tell your healthcare provider before having blood work. Don't assume that a supplement is irrelevant simply because it's sold over the counter. Your provider or the laboratory can tell you whether you need to stop biotin before a particular test and for how long.

The takeaway: Biotin isn't necessarily something you need to avoid. It's a reminder that “no obvious side effects” doesn't always mean “no unintended effects.” Sometimes the problem shows up on the lab report rather than in how you feel.

If you're taking biotin because your hair or nails have changed, explore our articles about skin, hair and nail changes in menopause to discover the many reasons these changes can happen during peri/menopause — and what may be worth investigating.

9. Berberine: The “Natural Metabolism” Supplement That Can Upset Your Gut

Berberine has become popular in the weight-management and metabolic-health world. It's promoted for blood sugar, insulin sensitivity, cholesterol, and weight loss.

But gastrointestinal side effects are among the more commonly reported problems with berberine supplements.

Berberine has become popular in the weight-management and metabolic-health world. It's promoted for blood sugar, insulin sensitivity, cholesterol, and weight loss. At the same time, gastrointestinal side effects are among the more commonly reported problems with berberine supplements, which can be especially frustrating when you're taking a supplement because you expect it to make you feel healthier, not give you a new digestive problem.

Common side effects include:

• Nausea
• Diarrhea
• Bloating
• Constipation

Berberine can also interact with medications, so “natural” does not mean “interaction-free.” This is particularly worth considering if you take medications for diabetes or blood sugar, high blood pressure, high cholesterol, or blood thinning. Berberine can lower blood glucose and may affect some of the enzymes involved in how medications are processed by the body, potentially changing how certain drugs work. The specific interaction depends on the medication, dose, and individual, so if you're taking prescription medications, it's a good idea to have a pharmacist or healthcare provider check the combination before adding berberine.

If weight gain or changes in your metabolism are what led you to try supplements such as berberine, explore our articles about metabolism and weight during menopause to understand what can actually change during the menopause transition.

10. Turmeric and Curcumin: Anti-Inflammatory Isn't the Same as Side-Effect-Free

Turmeric has become a staple in the wellness world. You'll find it in foods, teas, powders, capsules, and concentrated curcumin supplements. Some people tolerate it perfectly well. Others experience digestive symptoms such as stomach upset, nausea, or diarrhea.

There's another important distinction here: turmeric used as a food ingredient is not necessarily equivalent to a concentrated curcumin supplement.

Some supplements are formulated to dramatically increase curcumin absorption. That's one reason supplement labels and formulations matter. So if you've recently started a concentrated turmeric or curcumin supplement and your stomach has started protesting, it's worth considering the connection.

11. Ashwagandha: The Stress Supplement That Can Cause Stomach Problems

Ashwagandha is often marketed for stress, sleep, anxiety, energy, and menopause. Evidence for its benefits varies by condition and preparation.

Potential side effects include:

• Stomach upset
• Diarrhea
• Vomiting

So if you take it for sleep or stress and find your stomach suddenly isn't happy, consider the supplement as part of the investigation.

Ashwagandha can also interact with medications, including thyroid medications, sedatives, and some medications for diabetes and blood pressure. Rare cases of liver injury have also been reported. If you're taking prescription medications, it's a good idea to have a pharmacist or healthcare provider check the combination before adding ashwagandha.

12. Green Tea Extract: The Concentrated Supplement (Not a Cup of Green Tea)

Green tea is a food and beverage with a long history of use. Green tea extract supplements are different. Concentrated extracts are commonly included in products marketed for metabolism, weight loss, energy, and antioxidants. The distinction matters because drinking a cup of green tea isn't equivalent to swallowing a concentrated extract.

Possible problems include:

• Nausea
• Abdominal discomfort
• Constipation

There have also been uncommon reports of liver injury associated with green tea extract products.

If you're taking a green tea extract supplement, particularly as part of a weight-loss product containing multiple ingredients, it's worth knowing exactly how much you're taking and what else is in the product.

13. Probiotics: When the Gut Supplement Makes You More Gassy

Probiotics are often sold with a simple promise — More “good bacteria” = happier gut. But the human gut is considerably more complicated than that. Some people experience GI symptoms when starting a probiotic, and the effects can vary depending on the strain, product, dose, and individual.

If you start a probiotic and suddenly notice more:

• Gas
• Bloating
• Abdominal discomfort

Don't automatically conclude that your gut “needs to detox.” It may simply mean that that particular product isn't agreeing with you. If your symptoms persist, it's worth looking beyond supplements rather than continually adding more products.

14. Psyllium and Fiber Supplements: Healthy Fiber Can Still Be Too Much, Too Fast

Fiber is good for you, but if you suddenly go from relatively little fiber to a large amount of supplemental fiber, your digestive system may object.

Possible symptoms include:

• Gas
• Bloating
• Abdominal discomfort

Psyllium can be useful for constipation and other purposes, but increasing fiber gradually and taking it with adequate fluid is important. There's also a bigger lesson here — A symptom doesn't always mean you need more of the thing that's supposed to fix it.

If you're already getting a substantial amount of fiber from your diet, adding multiple fiber supplements and “prebiotic” products may push your total intake higher than your gut comfortably handles.

15. Flaxseed: A Healthy Food That Can Be Too Much for Some Guts

Flaxseed is packed with fiber and is frequently recommended as part of a heart-healthy diet. It also shows up in menopause discussions because flax contains lignans, a type of phytoestrogen.

Increasing flax rapidly or eating large amounts can cause:

• Bloating
• Fullness
• Gas
• Diarrhea

Again, the problem isn't that flax is unhealthy. It's that dose matters. If you recently added large amounts of ground flax to smoothies, oatmeal, yogurt, or baked goods, and your digestion changed at the same time, try looking at the timeline.

16. Fish Oil and Omega-3 Supplements: Healthy Fats, Unhappy Stomach

• Fishy taste or burps
• Bad breath
• Heartburn
• Nausea
• Stomach discomfort
• Diarrhea

NIH describes these as generally mild side effects of omega-3 supplements. If you keep getting fishy burps or reflux after starting fish oil, you don't necessarily need to conclude that you “can't tolerate omega-3s. You may need to reconsider the formulation, dose, timing, or whether you need a supplement at all.

17. Melatonin: When Your Sleep Supplement Makes Tomorrow Worse

Melatonin is popular for sleep, including among women dealing with midlife sleep changes. However, there's an easy-to-miss downside — Next-day grogginess or drowsiness. If you're taking melatonin and waking up feeling like you didn't sleep — even though you technically slept — your supplement could be contributing.

More isn't necessarily better with sleep supplements. A larger dose isn't automatically going to produce better sleep, and individual responses vary. If persistent sleep problems are occurring during peri/menopause, it's worth looking at the underlying cause rather than simply increasing the supplement dose.

If you're reaching for magnesium or melatonin because sleep has become harder during menopause, our articles about sleep and fatigue may help you understand the many reasons your sleep may be changing — and what may actually help.

18. Black Cohosh: A Popular Menopause Supplement With an Important Safety Caveat

Black cohosh is one of the better-known herbal products marketed for menopause symptoms, particularly hot flashes. Research on its effectiveness is mixed, but NCCIH reports that some studies suggest possible benefit for overall menopause symptoms and hot flashes.

As for safety, black cohosh is generally well tolerated in studies, but rare cases of liver injury have been reported in people taking products labeled as black cohosh. It isn't always clear that black cohosh itself was responsible.

If someone taking black cohosh develops symptoms such as dark urine or unusual fatigue, they should contact a healthcare professional. This is a good example of why “herbal” shouldn't automatically be translated as “risk-free.”

If you're trying supplements because hot flashes or night sweats are disrupting your sleep and daily life, explore our articles about menopausal hot flashes and night sweats for evidence-based options beyond the supplement aisle.

19. Red Yeast Rice: Natural Isn't the Same as Mild

Red yeast rice is often used as a natural cholesterol-lowering supplement. The reason it works is also the reason it deserves respect: some red yeast rice products contain monacolin K, a substance chemically identical to the active ingredient in the cholesterol-lowering medication lovastatin. This means some products can have statin-like effects and side effects, including muscle symptoms and potential liver problems.

Product contents can also vary considerably. If you're considering red yeast rice for cholesterol, talk with your healthcare professional rather than assuming that “natural cholesterol medicine” is automatically safer or gentler than prescription treatment.

20. Sugar Alcohols: The “No Sugar” Ingredient That Can Send You Running

This one is hiding in plain sight. Sugar alcohols — also called polyols — include ingredients such as:

• Sorbitol
• Mannitol
• Xylitol
• Isomalt
• Some forms of erythritol

They're frequently used in:

• Sugar-free candy
• Gum
• Mints
• Protein products
• “Low sugar” foods
• Some supplements

Some sugar alcohols are poorly absorbed and can draw water into the intestine and undergo fermentation in the colon. For susceptible people, that can mean: Gas, bloating, abdominal cramps. or diarrhea.

The Monash FODMAP identifies polyols as an important source of GI symptoms in people with IBS and notes that tolerance varies considerably from person to person. So if your new “healthy” protein bar contains several sugar alcohols and your stomach has been unhappy ever since, read the label.

Don't Forget the “Healthy Food” Ingredients Hiding in Processed Foods

Sometimes the culprit isn't a supplement you remember swallowing. It's an ingredient buried in something you bought because it looked healthy.

This is particularly relevant to products marketed as:

• High fiber
• Gut healthy
• Prebiotic
• Low sugar
• Sugar free
• Keto
• Protein rich
• Plant based
• Dairy free

Ingredients worth checking include: Inulin, chicory root, FOS, GOS, sorbitol, mannitol, xylitol, and isomalt. The Monash FODMAP notes that these ingredients can appear in everything from protein powders and snack bars to yogurt, coffee substitutes and other processed foods.

That's why reading the ingredient list, rather than just the front of the package, can be surprisingly useful.

Why This Can Get More Complicated in Midlife

Peri/menopause can already bring changes in:

• Digestion
• Bowel habits
• Sleep
• Energy
• Mood
• Appetite
• Weight
• Muscle and bone health

That makes it tempting to add several supplements at once — And suddenly you're taking eight different products. Magnesium for sleep. Fiber for constipation. A probiotic for digestion. Protein powder for muscle. Iron for energy. A multivitamin “just in case.” A menopause supplement for hot flashes. A metabolism supplement for weight.

If you then develop bloating, nausea, constipation, diarrhea, headaches, grogginess, or another new symptom, it's very difficult to identify the culprit when everything changed at the same time.

If you're wondering whether a symptom you're trying to treat with supplements might actually be related to changing hormones, our HRT Guide explains what hormone therapy can and can't help with during peri/menopause.

A Better Way to Introduce Supplements

If you're adding a new supplement, consider changing one thing at a time whenever practical.

Keep track of:

• What you started
• The dose
• The exact product and formulation
• When you take it
• When symptoms began
• Any other supplements you're taking
• Prescription and over-the-counter medications

And don't forget to look at your multivitamin and combination products. You may discover that you're getting the same nutrient from several different places.

Food Isn't Automatically Better — and Supplements Aren't Automatically Better

The goal isn't to become afraid of healthy foods or supplements. It's to become better at recognizing the difference between “This is healthy.” and “This is healthy for me, in this amount, in this form.”

Remember:

• A food can be nutritious and still trigger symptoms in someone with a particular intolerance.

• A supplement can correct a deficiency and still cause side effects.

• A nutrient can be essential and still be harmful in excessive amounts.

And a product can be marketed as “natural” while containing a concentrated dose that behaves very differently from the food it came from.

When Should You Talk With Your Healthcare Professional?

Don't assume a new symptom is simply a supplement side effect. Talk with a healthcare professional if symptoms are severe, persistent, unexplained, or getting worse.

It's particularly important to discuss supplements if you:

• Take prescription medications
• Have kidney, liver, thyroid, or gastrointestinal disease
• Have been diagnosed with a nutrient deficiency
• Are taking several supplements
• Are preparing for surgery
• Develop unusual bleeding, severe abdominal pain, persistent vomiting, jaundice, dark urine, significant weakness, or new neurologic symptoms

Share your actual supplement bottles or a complete list of ingredients and doses with your doctor or pharmacist.

The Bottom Line

Sometimes the thing you're taking to improve your health can become the thing that's making you feel worse. That doesn't make magnesium, fiber, probiotics, turmeric, fish oil, iron, or the other products on this list “bad.” It means your body, the dose, the formulation, and the circumstances all matter.

If a new symptom appeared after a new “healthy” habit, don't just keep adding another supplement to fix it. Look at the whole picture — including what's hiding in the ingredient list.

If you're looking for ways to manage a menopause symptom, you don't necessarily have to reach for another supplement. MenoHello's Menopause Symptom Relief collection includes products selected for common menopause concerns, so you can explore options based on the symptom you're actually trying to manage.

And if you're realizing that some of the symptoms you've been trying to fix with supplements may actually be part of the menopause transition, our Menopause Video Library has videos covering menopause symptoms, hormones, and HRT.

Frequently Asked Questions

Can healthy foods and supplements cause side effects?

Yes. A food or supplement can be nutritious or beneficial and still cause unwanted effects in some people. Dose, individual sensitivity, formulation, medications, and underlying health conditions can all affect how someone responds.

Why does inulin make me bloated?

Inulin is a prebiotic fiber that is fermented by gut bacteria. Fermentation can produce gas, and some people — particularly people with IBS or FODMAP sensitivity — may experience bloating, abdominal distension, or discomfort after consuming inulin or chicory root.

Can chicory root cause gas and bloating?

Yes. Chicory root is a source of inulin and is commonly used in coffee substitutes and products marketed as high in prebiotic fiber. Some people experience gas and bloating after consuming it.

Can magnesium supplements cause diarrhea?

Yes. High intakes of magnesium from supplements or medications can cause diarrhea, nausea, and abdominal cramping. The amount and formulation of magnesium can affect how well it is tolerated.

Can calcium supplements cause constipation?

Yes. Calcium supplements can cause gastrointestinal side effects, including constipation, gas, and bloating in some people.

Can iron supplements cause constipation?

Yes. Constipation is a common problem with iron supplements, particularly at higher doses. Iron can also cause nausea, abdominal pain, stomach upset, vomiting, or diarrhea.

Can vitamin C supplements cause diarrhea?

Yes. Large doses of supplemental vitamin C can cause diarrhea, nausea, abdominal cramps, and other gastrointestinal symptoms.

Can too much zinc make you nauseous?

Yes. Excessive zinc intake can cause nausea, stomach upset, vomiting, loss of appetite, headaches, and dizziness. Long-term high-dose zinc can also interfere with copper absorption.

Can vitamin B6 supplements cause tingling or numbness?

Excessive supplemental vitamin B6 taken over time can cause peripheral neuropathy, which may include tingling, numbness, or other changes in sensation.

Can biotin interfere with thyroid tests?

Yes. High-dose biotin supplements can interfere with certain laboratory tests and may produce falsely high or falsely low results, including some thyroid hormone tests. Tell your healthcare professional if you take biotin before having blood work.

Can berberine cause bloating?

Yes. GI side effects reported with berberine include nausea, diarrhea, bloating, and constipation.

Can turmeric supplements cause stomach problems?

They can. Some people experience gastrointestinal symptoms after taking turmeric or concentrated curcumin supplements. Concentrated formulations can also behave differently from turmeric used as a food ingredient.

Can ashwagandha cause diarrhea?

Yes. Ashwagandha preparations can cause stomach upset, diarrhea, vomiting, or drowsiness in some people. Rare cases of liver injury have also been reported.

Can probiotics make bloating worse?

They can. Some people experience gas, bloating, or other digestive symptoms after starting a probiotic. Different probiotic strains and products can affect people differently.

Can fiber supplements cause gas and bloating?

Yes. Increasing fiber too quickly can cause gas, bloating, and abdominal discomfort. This can happen with products such as psyllium and other fiber supplements, particularly when several fiber or prebiotic products are combined.

Can flaxseed cause bloating?

Yes. Flaxseed is a nutritious source of fiber, but increasing the amount quickly or consuming large quantities can cause bloating, fullness, gas, or diarrhea in some people.

Can fish oil cause heartburn?

Yes. Fish-oil and other omega-3 supplements can cause heartburn, nausea, stomach discomfort, diarrhea, fishy taste, or bad breath in some people.

Can melatonin make you groggy the next day?

Yes. Melatonin can cause daytime drowsiness or grogginess in some people. If you regularly feel excessively sleepy the day after taking it, discuss the dose and your sleep problems with a healthcare professional.

Can sugar-free foods cause diarrhea?

Yes. Some sugar alcohols, including sorbitol, mannitol, and xylitol, are poorly absorbed and can draw water into the intestine and be fermented by gut bacteria. In susceptible people, they can cause gas, bloating, cramps, and diarrhea.

Should I stop taking a supplement if I develop side effects?

Not necessarily. Some supplements are being used to treat a genuine deficiency or health condition, so stopping them without guidance may not be appropriate. Instead, discuss the symptom with your healthcare professional and bring the exact product, dose, and ingredient list.

How can I figure out which supplement is causing my symptoms?

If it is medically appropriate, introducing supplements one at a time makes it easier to identify a reaction. Keep track of the product, dose, timing, and symptoms. Also check multivitamins and combination products because the same ingredient may appear in several products.

Are natural supplements safer than prescription medications?

Not necessarily. “Natural” describes the source, not the risk. Some supplements can cause significant side effects, interact with medications, affect laboratory tests, or have pharmacologic effects.

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This article is for informational and educational purposes only and does not constitute medical advice. The information provided should not be used as a substitute for professional medical consultation, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have regarding hormone therapy, bone health, osteoporosis prevention, or any medical condition.

Symptom Relief

Managing menopause symptoms can feel overwhelming, especially when effective solutions seem hard to find. From unexpected skin changes to frustrating hot flashes, these shifts can impact daily life and overall well-being. Explore our Symptom Relief page to discover products that other women have found helpful in managing their symptoms of perimenopause and menopause.

If you’ve found a product that has made a difference for you, let us know through our contact form—we’d love to share it with others!

Explore More

Want to dive deeper into menopause and its symptoms? Visit our Resources page, where you’ll find a collection of studies, articles, and books from trusted experts. Whether you're looking for the latest research or practical insights, these resources can help you better understand your body and make informed decisions about your menopause journey.

Related Reading:

References

1. National Institutes of Health, Office of Dietary Supplements. Magnesium. Information on magnesium intake, supplemental magnesium, and gastrointestinal side effects including diarrhea, nausea, and abdominal cramping.
2. National Institutes of Health, Office of Dietary Supplements. Calcium. Information on calcium requirements, calcium supplements, and potential gastrointestinal effects including gas, bloating, and constipation.
3. National Institutes of Health, Office of Dietary Supplements. Iron. Information on iron supplementation, iron deficiency, and gastrointestinal side effects including constipation, nausea, abdominal pain, vomiting, and diarrhea.
4. National Institutes of Health, Office of Dietary Supplements. Vitamin C. Information on vitamin C requirements and gastrointestinal effects of excessive supplemental intake, including diarrhea, nausea, and abdominal cramps.
5. National Institutes of Health, Office of Dietary Supplements. Zinc. Information on excessive zinc intake and associated effects including nausea, vomiting, abdominal discomfort, loss of appetite, and copper deficiency with prolonged high intake.
6. National Institutes of Health, Office of Dietary Supplements. Vitamin B6. Information on vitamin B6 supplementation, recommended intake, and potential adverse effects associated with excessive intake.
7. National Institutes of Health, Office of Dietary Supplements. Biotin. Information on biotin supplements and their potential to interfere with laboratory tests, including tests measuring thyroid hormones.
8. National Center for Complementary and Integrative Health (NCCIH). Berberine and Weight Loss: What You Need To Know. Information on berberine, its potential uses, gastrointestinal side effects including nausea, abdominal pain, bloating, constipation, and diarrhea, and potential medication interactions.
9. National Center for Complementary and Integrative Health (NCCIH). Turmeric: Usefulness and Safety. Information on oral turmeric and curcumin, gastrointestinal side effects including nausea, vomiting, acid reflux, stomach upset, diarrhea, and constipation, and safety concerns associated with highly bioavailable curcumin formulations.
10. National Center for Complementary and Integrative Health (NCCIH). Ashwagandha: Usefulness and Safety. Information on ashwagandha's potential uses and side effects including drowsiness, stomach upset, diarrhea, and vomiting, as well as medication interactions and rare reports of liver injury.
11. National Center for Complementary and Integrative Health (NCCIH). Green Tea: Usefulness and Safety. Information distinguishing green tea beverages from concentrated green tea extract supplements, including potential side effects such as nausea, constipation, abdominal discomfort, and rare liver injury.
12. National Center for Complementary and Integrative Health (NCCIH). Probiotics: Usefulness and Safety. Information on probiotic supplements and fermented foods, their safety, potential adverse effects, and differences among probiotic microorganisms and products.
13. National Center for Complementary and Integrative Health (NCCIH). Irritable Bowel Syndrome: What You Need To Know. Information on complementary approaches for IBS, including probiotics and prebiotics, and potential gastrointestinal effects such as gas, bloating, abdominal pain, cramps, and diarrhea.
14. Monash University FODMAP. Update: Label Reading and FODMAPs. Guidance on identifying FODMAP ingredients in packaged foods, including inulin, chicory root, chicory root fiber, fructooligosaccharides (FOS), galactooligosaccharides (GOS), and polyols, and their potential to cause gas, bloating, and abdominal distension.
15. National Center for Complementary and Integrative Health (NCCIH). Flaxseed and Flaxseed Oil: Usefulness and Safety. Information on flaxseed and flaxseed oil and potential digestive effects of higher doses, including bloating, fullness, and diarrhea.
16. National Institutes of Health, Office of Dietary Supplements. Omega-3 Fatty Acids. Information on omega-3 food sources and supplements and potential side effects including unpleasant taste, bad breath, heartburn, nausea, stomach discomfort, and diarrhea.
17. National Center for Complementary and Integrative Health (NCCIH). Melatonin: What You Need To Know. Information on melatonin supplements, potential side effects including sleepiness, nausea, headache, and dizziness, and the possibility of daytime drowsiness in older adults.
18. National Center for Complementary and Integrative Health (NCCIH). Black Cohosh: Usefulness and Safety. Information on black cohosh for menopause symptoms, its generally good tolerability in studies, potential medication interactions, and rare reports of liver injury.
19. National Center for Complementary and Integrative Health (NCCIH). Red Yeast Rice. Information on monacolin K in red yeast rice products, statin-like effects, potential muscle, kidney, and liver problems, digestive side effects, drug interactions, and product variability.
20. Monash University FODMAP. What Are Polyols? Information on sugar alcohols including sorbitol, mannitol, xylitol, maltitol, and isomalt, and how these carbohydrates can contribute to gas, bloating, abdominal pain, and altered bowel habits.
21. Monash University FODMAP. FODMAP Food List. Information on high-FODMAP foods and ingredients, including fructose, sorbitol, fructans, GOS, and sugar polyols, and their relevance to digestive symptoms.

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