Turmeric benefits, nutrition facts and side effects

Turmeric is everywhere right now. Lattes, gummies, shots, capsules with black pepper, face masks. Depending on who you ask it fixes your joints, your gut, your mood and your waistline. So we went and read the actual research, plus the nutrition data from the USDA, to sort out what is real and what is just marketing.

Short version: turmeric is a great spice and a fine thing to eat every day. The big health claims mostly come from studies on concentrated curcumin pills, not the spoonful in your curry. And those pills do come with some side effects worth knowing about.

Quick answers

1 teaspoon of ground turmeric (3 g) has about 9 calories. A tablespoon has about 29.
The best evidence for curcumin is for knee arthritis pain. Most other benefits are early or small.
It is not a weight loss tool. In studies, curcumin pills helped people lose about half a kilo (1.3 lb) on average.
Cooking with turmeric is safe for almost everyone. Supplements can cause stomach upset and, rarely, liver injury, and can interact with blood thinners.

What is turmeric, anyway?

Turmeric (Curcuma longa) is a root from the ginger family. Fresh, it looks a lot like ginger, but cut it open and it is bright orange inside. The powder in your spice rack is just that root, boiled, dried and ground.

The yellow colour comes from compounds called curcuminoids. The main one is curcumin, and that is the stuff scientists study. Here is the catch most articles skip: turmeric powder is only about 3% curcumin by weight. One lab study of 28 products found pure turmeric powder averaged 3.14%. So a teaspoon gives you roughly 90 mg of curcumin, while many studies use 500 to 2,000 mg a day.

Turmeric nutrition facts

These numbers come straight from the USDA FoodData Central entry for ground turmeric. Per 100 g it looks impressive, but nobody eats 100 g of turmeric. That is about 33 teaspoons. So we have also worked out a teaspoon and a tablespoon, which is what you actually use.

Ground turmeric: nutrition per 100 g, 1 tsp and 1 tbsp
Nutrient	Per 100 g	1 tsp (3 g)	1 tbsp (9.4 g)
Calories	312 kcal	9 kcal	29 kcal
Carbohydrate	67 g	2 g	6.3 g
Fibre	22.7 g	0.7 g	2.1 g
Protein	9.7 g	0.3 g	0.9 g
Fat	3.3 g	0.1 g	0.3 g
Sugars	3.2 g	0.1 g	0.3 g
Potassium	2,080 mg	62 mg	196 mg
Iron	55 mg	1.7 mg	5.2 mg
Manganese	19.8 mg	0.6 mg	1.9 mg
Magnesium	208 mg	6 mg	20 mg
Vitamin E	4.4 mg	0.1 mg	0.4 mg
Sodium	27 mg	0.8 mg	2.5 mg

Source: USDA FoodData Central, "Spices, turmeric, ground" (FDC 172231). Teaspoon and tablespoon weights are USDA's own. Values are rounded.

How many calories are in turmeric?

Almost none, in the amounts people use. 1 teaspoon of ground turmeric is about 9 calories and 1 tablespoon is about 29. Even a big turmeric latte with a whole teaspoon in it gets nearly all its calories from the milk and the sweetener, not the spice.

Is turmeric high in potassium?

Per 100 g, yes, it is very high (2,080 mg). Per teaspoon, no. A teaspoon has about 62 mg, which is roughly 1% of the daily value. For comparison, a medium banana has around 420 mg. If you are on a low-potassium diet for kidney disease, normal cooking amounts are not a big deal, but ask your dietitian about supplements and large doses.

What vitamins and minerals does turmeric have?

The standout is manganese: one teaspoon gives about a quarter of your daily value. Turmeric also lists a lot of iron (1.7 mg per teaspoon, about 9% of the daily value). Take that iron number with a pinch of salt, though. The USDA figure comes from a single lab sample, and spices can pick up iron from soil and grinding. Turmeric is not really a meaningful source of vitamins. There is a little vitamin E and vitamin K, and basically no vitamin C in the powder.

Fresh turmeric root vs turmeric powder

Fresh turmeric is mostly water (about 84%), so it is much lower in calories by weight. The Philippine government's food composition table lists raw turmeric root at about 71 calories per 100 g, with 9.6 g of carbs and 4.1 g of fibre. The USDA has no entry for fresh turmeric, and good data on it is honestly thin, so treat those numbers as a rough guide.

Swap rule: about 1 tablespoon of finely grated fresh turmeric equals 1 teaspoon of ground turmeric.
Flavour: fresh is brighter, a bit peppery and citrusy. Powder is earthier and more bitter.
Storage: keep fresh root in the fridge for a couple of weeks, or freeze it and grate it from frozen.
Heads up: it stains everything. Wear gloves, and wipe chopping boards quickly.

Turmeric benefits: what the research actually says

This is where it gets messy. The US National Center for Complementary and Integrative Health (NCCIH) puts it bluntly: we don't know enough yet to say for sure that turmeric or curcumin helps with any health problem. That doesn't mean it does nothing. It means most studies are small, short, and use concentrated curcumin products. Here is a fair summary.

Curcumin benefits and how strong the evidence is
Claim	Evidence	What the studies found
Knee arthritis pain	Moderate	Less pain and stiffness than placebo, about as good as some painkillers in small trials
Inflammation markers	Moderate	Lower CRP, IL-6 and TNF-α in blood tests. That is not the same as feeling better
Indigestion	Limited	One trial: curcumin worked about as well as omeprazole for indigestion
Blood sugar	Limited	Small drops in HbA1c and fasting glucose, only in people with diabetes or prediabetes
Muscle soreness	Limited	A bit less soreness after hard exercise
Mood	Limited	May help a little alongside normal depression treatment, never instead of it
Cholesterol	Limited	Small drops in triglycerides; LDL results are mixed
Weight loss	Weak	About 0.6 kg (1.3 lb) more weight loss on average
Memory, heart, skin	Early / mixed	Studies disagree or are too small to say

Nearly all of these trials used curcumin supplements (often 500 mg to 2 g a day), not cooking amounts of turmeric.

Joint pain and arthritis

This is the best-supported use. A 2022 meta-analysis found curcumin beat placebo for knee osteoarthritis pain and function, and did about as well as NSAID painkillers like ibuprofen, with similar side effects. The trials are small, so it is promising rather than proven. If you are thinking of trying it for sore knees, tell your doctor, especially if you already take painkillers or blood thinners.

Inflammation

You will see turmeric called "anti-inflammatory" everywhere. In a large review of trials (almost 6,000 people), curcumin did lower blood markers of inflammation like CRP and IL-6. But lower numbers on a blood test do not automatically mean less pain or less disease, and the studies varied a lot.

Digestion and bloating

A Thai trial with about 200 people found 2 g of curcumin a day eased indigestion about as well as omeprazole, a common acid reducer. Interesting, but it is one study, and it had no placebo group. Funnily enough, high doses of turmeric can also cause stomach upset (more on that below).

Blood sugar and cholesterol

In people with type 2 diabetes or prediabetes, curcumin lowered HbA1c by about half a point and fasting sugar a little. It may also trim triglycerides. These are real but modest effects, and they come on top of medicine, food and exercise, not instead of them.

Does turmeric help you lose weight?

We get asked this a lot (the name doesn't help). The honest answer: not really. A big 2023 review of 50 trials found people taking curcumin lost about 0.6 kg (1.3 lb) more than people on placebo, over weeks to months. Waist size dropped by just over a centimetre. That is a tiny effect, and it showed up mostly in people with obesity or diabetes who were also changing their diet. There is no good evidence that adding turmeric to food burns fat. If a product promises turmeric slimming, be sceptical.

Mood, memory, heart and skin

There are small studies on all of these. Curcumin may help mood a bit when added to normal depression care. Memory results are mixed; one 2025 review found a benefit in people over 60, another found none. Blood pressure studies disagree. Skin studies are early. Nice to know, not reasons to buy a supplement.

Black pepper and fat: getting more out of turmeric

Curcumin is poorly absorbed. Your gut and liver break it down fast, and in one study 2 g of plain curcumin left almost nothing in people's blood. That is why so many products add black pepper.

Black pepper contains piperine. In a small 1998 study, adding 20 mg of piperine to 2 g of curcumin raised absorption by about 2,000%. That number gets quoted everywhere, but it came from a handful of volunteers and has not been well repeated. Curcumin also dissolves in fat, so cooking it in oil, ghee or coconut milk probably helps too.

In the kitchen: a pinch of black pepper and a little fat is a good habit and completely safe. In pills: it is a different story. Piperine slows how your body clears some medicines, and "high-absorption" curcumin products are the ones most linked to liver problems. More absorption is not automatically better.

10 turmeric side effects to know about

Turmeric in food is very safe. Nearly every side effect below comes from supplements, high doses, or specific health conditions. Here is what the evidence supports.

Stomach upset. Nausea, reflux, diarrhoea or constipation are the most common complaints, mostly at high doses. People with reflux or ulcers tend to notice it more.
Liver injury (rare but serious). The US Drug-Induced Liver Injury Network has documented liver injury from turmeric supplements, with cases rising since 2011. Most people recovered after stopping, but some were hospitalised and one died. Many of them carried a gene variant (HLA-B*35:01) that seems to raise the risk. Australia's medicines regulator found the same pattern, mostly with high-dose or high-absorption products. Warning signs: unusual tiredness, nausea, loss of appetite, dark urine, yellow skin or eyes.
Bleeding risk with blood thinners. Turmeric may increase the effect of warfarin and other blood thinners. New Zealand's medicines safety agency has a report of a patient's INR (a clotting test) shooting above 10 after taking turmeric. If you take any blood thinner, don't take turmeric supplements without asking your doctor.
Kidney stones. Turmeric is high in oxalate. In a small study, turmeric supplements raised the amount of oxalate in people's urine, which is a risk factor for the most common type of kidney stone. If you have had stones, skip the pills.
Gallbladder problems. Curcumin makes the gallbladder squeeze. If you have gallstones or a blocked bile duct, that can trigger pain, so avoid supplements.
Low blood sugar with diabetes medicine. Because curcumin can lower blood sugar a little, adding it to diabetes medication could push sugar too low. Check with your doctor and watch your readings.
Lower iron absorption. Curcumin binds iron in the gut. There is a published case of someone who developed iron-deficiency anaemia on a high-dose turmeric supplement, which cleared up after she stopped. Worth knowing if you are already low on iron.
Drug interactions. Curcumin (and especially piperine) can change how your body handles some medicines, including certain transplant drugs like tacrolimus and some chemotherapy drugs. If you take regular medication, run it past a pharmacist.
Allergic and skin reactions. Some people get itchy rashes or hives, usually from turmeric on the skin, like face masks.
Lead contamination. This is about the spice itself. Some turmeric, particularly from parts of Bangladesh, was found to be coloured with lead chromate to make it look brighter. Stanford researchers linked it to high lead levels in people. There have also been several US recalls of turmeric for lead. Buy from brands you trust.

Who should skip turmeric supplements?

Pregnant or breastfeeding women (food amounts are fine)
Anyone taking blood thinners, diabetes medication, transplant drugs or chemotherapy
People with liver disease, gallstones or a history of kidney stones
People with iron-deficiency anaemia
Anyone with surgery coming up (a common precaution is to stop about two weeks before, because of bleeding risk)

How much turmeric is safe per day?

As food: a teaspoon or two a day in cooking is normal and safe. People in India commonly eat around 2 to 2.5 g of turmeric a day (roughly a teaspoon) over a lifetime.

As a supplement: studies usually use 500 mg to 2 g of curcumin a day for up to about three months. NCCIH says standard products are likely safe in recommended amounts for 2 to 3 months. European and WHO food safety experts set an acceptable daily intake of 3 mg of curcumin per kg of body weight, which is about 180 mg a day for a 60 kg adult and 210 mg for 70 kg. That limit is a conservative lifelong number, not a danger line, but it shows how far above everyday eating most supplements go.

If you want to take curcumin for a reason, like knee pain, talk to your doctor or pharmacist first, pick a plain product (not "enhanced absorption") and stop if you notice any warning signs.

Turmeric powder, tea or supplements?

Turmeric powder: cheap, tasty, safe. Great for flavour and colour, but it won't deliver study-level doses of curcumin.
Turmeric tea and golden milk: a nice warm drink, and a gentle way to get some turmeric in every day. Think of it as a cosy habit, not a treatment.
Curcumin supplements: the only way to reach the doses used in studies, which is exactly why they carry more risk. Supplements are not checked for quality the way medicines are, so look for third-party testing (like USP or NSF).

Buying tips for turmeric powder: pick a brand you trust, avoid suspiciously bright or cheap loose powder, and store it in a closed jar away from light. It loses flavour after a year or so.

Easy ways to use turmeric every day

The best way to enjoy turmeric is in food you actually want to eat. A few easy ideas:

Stir half a teaspoon into rice while it cooks, with a pinch of black pepper.
Add it to scrambled eggs or tofu, soups and lentils.
Toss vegetables in oil, turmeric, cumin and salt before roasting.
Make a mug of turmeric tea or golden milk in the evening.

Here are our turmeric recipes, each one simple enough for a weeknight:

Drink · 12 minTurmeric tea (fresh or ground)

Drink · 7 minGolden milk (turmeric latte)

Side dish · 30 minGolden turmeric rice

Side dish · 40 minTurmeric roasted cauliflower

Main · 40 minEveryday dal with turmeric

Curious about turmeric's cousin? Read our guide to ginger, including how many calories it has, or browse the full nutrient guide.

Turmeric questions people ask

About 9 calories. One teaspoon of ground turmeric weighs about 3 g, and turmeric has 312 calories per 100 g (USDA). A tablespoon has about 29 calories.

Yes, in food. A teaspoon or so a day in cooking or drinks is normal and safe for almost everyone. Daily high-dose supplements are different: talk to your doctor first, especially if you take medication.

In cooking, yes. A pinch of pepper with turmeric is a normal combination. In supplements, piperine raises absorption of curcumin and of some medicines, and high-absorption products are linked to more liver injury reports, so be more careful there.

No good evidence says so. Curcumin pills helped people lose about 0.6 kg (1.3 lb) more than placebo on average in studies, which is a very small effect. Cooking with turmeric does not burn fat.

Turmeric in food: no evidence of that. Turmeric and curcumin supplements have been linked to rare cases of liver injury, often with high-dose or high-absorption products. Stop and see a doctor if you get dark urine, yellow eyes or skin, or unusual tiredness.

Neither is clearly better for health. Fresh tastes brighter and is lower in calories by weight because it is mostly water. Powder is more concentrated. Use about 1 tablespoon of grated fresh root for every teaspoon of powder.

There is no proven best time. With food is a good idea: the fat in a meal may help absorption, and it is gentler on your stomach.

This article is for general information and is not medical advice. Talk to your doctor before changing your diet or taking supplements.

Turmeric benefits, nutrition facts and side effects

What is turmeric, anyway?