10 Serious Side Effects of Turmeric!
10 Serious Side Effects of Turmeric!
Turmeric has a long, well-earned reputation in traditional medicine and modern kitchens alike. It's also not risk-free at higher doses, here's an honest look at what the evidence actually shows.
The Basics
Turmeric has been used in Ayurvedic medicine for centuries, and its popularity as a modern supplement has grown largely around its anti-inflammatory reputation. Most of what turmeric is credited for traces back to curcumin, the compound that gives it its color, though curcumin is poorly absorbed on its own, which is why it's so often paired with black pepper, whose piperine content meaningfully improves absorption.
It's worth remembering that supplements aren't regulated the same way medications are, so the actual curcumin content can vary noticeably between batches and manufacturers. None of that makes turmeric dangerous in normal use, but it does mean the side effects below are worth taking seriously, especially at supplement-level doses rather than ordinary cooking amounts.
10 Documented Side Effects
The most common complaint, by far. Turmeric can cause stomach upset, gas, bloating, acid reflux, nausea, or diarrhea in some people, even at normal culinary doses. If you notice this, cutting back the amount you're using is usually enough to resolve it.
This one is genuinely well documented. A study published in the American Journal of Clinical Nutrition found that supplemental doses of turmeric can meaningfully raise urinary oxalate levels, and oxalate is responsible for the majority of kidney stones. The risk is mainly tied to concentrated supplement doses, not ordinary cooking, and the National Kidney Foundation considers turmeric safe in normal culinary amounts even for people with a history of kidney stones. Anyone who's had calcium oxalate stones before should be more cautious with turmeric supplements specifically.
Turmeric and curcumin may lower blood sugar, which sounds like a benefit until you're also taking a diabetes medication, where the combined effect could push blood sugar lower than intended. Anyone with diabetes who uses turmeric supplements should monitor their blood sugar closely and loop in their doctor.
Turmeric and curcumin are generally considered safe, but in recent years they've been linked to rare cases of immune-mediated acute liver injury, particularly with high-bioavailability formulations designed to boost absorption. These cases typically resolve once the supplement is stopped, though continued use after symptoms appear can lead to more serious outcomes. Anyone with an existing liver condition should be especially cautious with concentrated turmeric supplements.
Curcumin has a genuine blood-thinning effect, which means it can amplify the effect of medications that slow blood clotting and increase bleeding risk, including during and after surgery. Most guidance recommends stopping turmeric or curcumin supplements at least two weeks before any planned surgery, and anyone with a bleeding disorder should use turmeric cautiously.
Turmeric can lower blood pressure, which is the opposite of what the heading on many older articles about this implies. The concern isn't that turmeric causes high blood pressure, it's that it can cause an unwanted drop, particularly in people already taking blood pressure medication or those who run low to begin with. If you're on blood pressure medication, talk to your doctor before adding turmeric supplements.
Turmeric contains volatile oils that can cause irritation or an allergic reaction in some people when applied to skin. If you're trying turmeric in a DIY face mask or paste, do a small patch test first rather than applying it directly to your full face.
This one needs a clear distinction. Turmeric used in the amounts found in ordinary cooking is generally considered safe during pregnancy. The actual caution is about concentrated turmeric or curcumin supplements at higher doses, which most sources recommend avoiding during pregnancy and breastfeeding unless a doctor says otherwise, partly because of turmeric's blood-thinning effect and its traditional association with stimulating menstrual flow.
Beyond blood thinners, blood pressure medication, and diabetes medication already covered above, turmeric has also been reported to interact with antidepressants, antibiotics, antihistamines, and some chemotherapy treatments. If you take any prescription medication regularly, it's worth a quick conversation with your doctor before adding turmeric supplements to your routine.
One case report describes a man who developed a serious irregular heart rhythm after taking very large doses of turmeric, more than 1500 mg twice daily. He was also taking a number of other medications at the time, which may have contributed, so this isn't strong evidence that turmeric alone causes this at normal doses. We weren't able to independently verify the original source for this specific case, so treat it as a single, confounded report rather than an established risk, though it's a reasonable argument for not taking turmeric in amounts far beyond what's typically recommended.
Shop Organic Turmeric Powder
Non-GMO · Packed Fresh in McKinney, TexasHow Much Turmeric Is Too Much?
Turmeric powder is made from mature turmeric rhizomes, the underground stems of the plant, that have been dried and ground. The curcumin content varies, but turmeric powder is typically somewhere around 2% to 8% curcumin by weight, which works out to roughly 75 to 200 mg of curcumin per teaspoon depending on the specific turmeric and how concentrated it is. There's genuine disagreement across sources on the exact figure, so treat any single precise number with some skepticism.
A Note on Turmeric for Dogs
Turmeric is a common question among pet owners, and veterinary sources generally consider it safe for dogs in appropriately small amounts, often cited around 15 to 20 mg per pound of body weight per day. As with humans, a small amount of black pepper helps with absorption, though too much black pepper on its own can irritate a dog's digestive tract, so moderation matters on both ingredients.
- Mix 3 tablespoons of turmeric powder with 1 tablespoon of freshly ground black pepper in a saucepan.
- Add 1/2 cup of coconut oil or olive oil and stir until it forms a thick paste.
- Store in an airtight container in the refrigerator for up to two weeks.
- Mix a small amount into your dog's food once a day, starting with about 1/4 teaspoon for small dogs and up to 1 teaspoon for larger dogs, increasing gradually only if your dog tolerates it well.
Talk to your veterinarian before starting your dog on turmeric regularly, especially if your dog takes blood thinners or diabetes medication, or has gallbladder or bile duct issues. Start with a small amount and watch for any signs of stomach upset before continuing.
Everyday Ways to Use Turmeric
- Heat milk in a small saucepan over medium heat until it begins to bubble around the edges. Do not boil.
- Combine the turmeric, organic cinnamon powder, and organic ginger powder into the milk, reduce heat to low, and simmer for about 5 minutes.
- Remove from heat and strain into a mug through a fine mesh strainer.
- Stir in honey to taste and serve warm.
