A golden root with a 4,000-year story

Snap open a fresh turmeric root and you will find an orange center under a yellowish brown skin. To make the spice in your cupboard, growers boil or steam the roots. That step removes the raw smell and gives the finished powder an even color. Then they dry the roots in the sun, polish them and grind them into powder.[1]

People in India have used turmeric for nearly 4,000 years. Its bright color earned it the nickname "Indian saffron." Sanskrit has at least 53 names for it. One of them, kanchani, refers to its golden color.[1]

From India, turmeric traveled. It probably reached China by 700 AD, East Africa by 800 AD and West Africa by 1200 AD. It arrived in Jamaica in the 1700s. In 1280, Marco Polo wrote with wonder about a vegetable that seemed so much like saffron.[1]

This guide covers what gives turmeric its color and how curcumin acts as an antioxidant. You will see what lab and human studies have looked at, how the body handles curcumin, and how food amounts compare with supplements. It also covers safety, easy ways to cook with turmeric and what you may see on a supplement label.

What's in the spice

Turmeric comes from Curcuma longa, a leafy plant in the ginger family. It is grown mostly in India and Southeast Asia.[2] The part you use is the rhizome, an underground stem that looks like a root.

The plant comes back year after year. It grows to about 1 meter tall (a little over 3 feet), with long, oblong leaves. It thrives at temperatures between 20 and 30 °C (68 to 86 °F) with plenty of rain through the year. India produces nearly all of the world's turmeric and uses about 80 percent of it at home.[1]

If you want to be sure a product uses this plant, look for the Latin name on the label. Our guide to Latin names on supplement labels explains why that detail matters.

The color comes from a small family of compounds called curcuminoids. Curcumin is the best known, and it has two close chemical relatives. Together, they make up only about 1 to 6 percent of turmeric by weight. Curcumin itself is roughly 60 to 70 percent of that share.[3]

That small share explains why turmeric products can differ so much. Plain turmeric powder and an extract made to concentrate curcumin can deliver very different amounts. Our guide to standardized extracts and whole herb powders shows how to tell them apart.

Turmeric in the kitchen and in tradition

Turmeric gives curry its yellow color. It is a main ingredient in most curry powders and a staple of South Asian and Middle Eastern cooking. Food makers also use it to color mustard, cheese, butter, cereals and chips.[1]

Health traditions have used it for centuries. Chinese, Indian, Islamic and Thai traditional medicine all include turmeric.[2] In India, it is part of Ayurveda, a system that relies mainly on plant-based remedies.[1]

Turmeric belongs to celebrations, too. In Southeast Asia, it is part of religious ceremonies as well as a main spice. In some traditions, turmeric paste is applied to the skin of the bride and groom before a wedding.[1]

Tradition tells us how people have valued a plant over many generations. Modern research asks a different question. What do its compounds do inside the body, and in what amounts?

How curcumin works as an antioxidant in the lab

Free radicals are unstable molecules. When they build up, they can damage fats, proteins and DNA.[4] Your body keeps them in balance with its own enzymes and with antioxidants from food. Our guide to how the body handles oxidative stress explains the whole system.

In test tubes and cell studies, curcumin can neutralize several kinds of free radicals. It dissolves in fat, which makes it good at catching a type of radical that attacks fats. Lab work also shows curcumin can influence the cell's own antioxidant enzymes. These include superoxide dismutase (SOD) and catalase.[5]

Part of this effect seems to run through Nrf2. Think of Nrf2 as a switch inside cells that turns on protective enzymes.[3]

Lab findings like these give researchers a starting point. Human studies then look at what happens in the body.

What human studies have measured

Researchers can't watch free radicals in a living person. Instead, they measure markers in the blood. One common marker is malondialdehyde (MDA). It forms when the fats in cell membranes are damaged by oxidation.[4] Another is the activity of the body's own antioxidant enzymes, such as SOD.

Several reviews have pooled the human trials:

• A 2018 review pooled 8 randomized trials with 626 people. Each trial lasted at least 4 weeks. The reviewers looked at MDA and at two antioxidant enzymes, SOD and one found in red blood cells.[6]
• A 2023 review pooled 66 trials in adults. It looked at total antioxidant capacity, MDA and SOD. It also looked at markers of the body's inflammatory response.[7]
• A 2019 review of 15 trials looked at MDA and SOD as well.[8]

The trials used many different doses, forms and study lengths.

One small placebo-controlled study looked at healthy adults. Thirty-eight people aged 40 to 60 took either a placebo or 80 milligrams (mg) a day of a fat-based curcumin for 4 weeks. Researchers tested blood and saliva before and after. They measured a range of markers, including catalase activity in the blood and the saliva's ability to neutralize free radicals.[9]

How the body handles curcumin

After a meal, curcumin meets the same processing system your body uses for many compounds. The gut wall and liver attach chemical tags to it. The tags help it dissolve in water and later leave the body.[3] Our guide to your body's natural detox processes calls this the Phase II tagging step.

One small study followed this with ordinary food. Four people ate bread, soup and an oat bar made with 3 grams of turmeric in total. That is about 100 mg of curcumin. Tagged forms of curcumin showed up in the blood of all four, peaking about 30 minutes after the meal.[3]

Using turmeric with care

According to NIH's center for complementary health, the most common side effects of turmeric are digestive, such as nausea, stomach upset or loose stools.[2] Following the directions on your label is the simplest way to start.

Liver reactions are rare. NIH's LiverTox database notes that most reported cases involved forms of curcumin made to absorb better.[10] If you notice any of the signs listed under "When to see a clinician" below, stop and call your clinician.

Lab and animal studies suggest curcumin may change how the body handles some medicines, including blood thinners. Reviewers advise care with these pairings.[11] If you take one, ask your pharmacist or clinician first.

Curcumin also prompts the gallbladder to squeeze. In a small study of 12 healthy people, 20 mg of curcumin shrank gallbladder volume by about 29 percent within 2 hours.[12] That squeeze releases bile, and it is a normal part of digesting fat. If you have gallbladder concerns, talk with your clinician before taking turmeric supplements.

NIH says turmeric supplements may be unsafe during pregnancy.[2] If you are pregnant or breastfeeding, check with your clinician before taking a turmeric supplement.

Food amounts and supplement amounts

People in cities tend to eat less turmeric (about 200 mg a day) than people in rural areas (about 600 mg).[1] Curcumin compounds make up only 1 to 6 percent of the spice, so even the high end works out to about 60 milligrams.

Supplements can supply far more in a single day. Cooking with turmeric brings color, flavor and a small daily amount. A supplement offers a measured amount in a capsule.

Turmeric at the stove and on the label

Here is an easy kitchen habit. Warm a little oil in the pan, stir in the turmeric for a minute until it smells toasty, and finish with a few grinds of black pepper.

• Stir it into lentils, rice, soups and curries.
• Whisk a pinch into scrambled eggs, or toss cauliflower with turmeric and olive oil before roasting.
• For a golden evening drink, warm a mug of milk with half a teaspoon of turmeric, a pinch of black pepper and a little cinnamon or honey.
• Grate fresh turmeric root the way you would fresh ginger, into a dressing or a pot of soup.

If you'd rather take turmeric as a supplement, the label is where products show their differences. Some hold plain root powder and some hold a concentrated extract, so the curcumin content differs.[10] Here is what you may see:

• The amount of turmeric per serving. For an extract, you may also see the amount or percentage of curcuminoids. Plain turmeric powder carries them at the spice's natural 1 to 6 percent.[3] If an extract is labeled standardized, look for the percentage it names.
• Black pepper extract (piperine) or a specially processed curcumin. When a product includes one of these, the ingredient list names it.[10]
• A blend. If turmeric shares a blend with other ingredients, you may see one total amount for the whole blend. Our guide to reading a supplement label explains how these labels are set out.

Our series guide to reading a supplement label walks through the rest of the panel, from serving size to directions. Keep turmeric in your cooking, too. Whatever you choose sits alongside meals with vegetables and protein, enough water, regular movement and steady sleep.

Frequently asked questions

What's the difference between turmeric and curcumin?

Turmeric is the whole spice. Curcumin is the best-known compound inside it, and it makes up only a small share of the spice by weight. Most human research measures curcumin or the curcumin family as a group.

Is cooking with turmeric enough?

Cooking with turmeric adds color, flavor and a modest amount of curcumin. It is an easy daily habit. Most human trials of curcumin have used larger amounts than a typical diet supplies.[9] You can enjoy both: turmeric in the kitchen and a measured amount in a supplement.

Should I take turmeric with black pepper?

In the kitchen, a few grinds of pepper in a turmeric dish are an easy habit. Some supplements also add black pepper extract (piperine). Piperine slows one of the body's processing steps, so it may change how some medicines are handled too.[13] If you take prescription medicine, ask your pharmacist before adding a product that contains it.

Can I take turmeric while pregnant?

Turmeric in food is a normal part of many diets. Supplements are different. NIH says turmeric supplements may be unsafe during pregnancy, so skip them unless your clinician advises otherwise.[2]

Can turmeric take the place of my medicine?

No. A turmeric supplement is meant to add to your diet and routine. It works alongside the plan you and your health care professional have set. Never stop or change a prescribed medicine on your own.