Quick answer
Turmeric is the main food source of curcumin. In one analysis of 28 spice products, pure turmeric powder averaged 3.14% curcumin by weight, about 31 mg per gram, while curry powders held much less. Curcumin is also a yellow food color, E 100, and plain curcumin is poorly absorbed even at 2 g.1,2,3
Key facts
- Pure turmeric powder averaged 3.14% curcumin by weight, while curry powders, with one exception, held much less and varied widely.1
- Curcumin is authorized as the yellow food color E 100 in 57 food categories in Europe, but most food samples tested had too little to detect.2
- In 10 healthy young women, 0.5 g of turmeric powder in a rice meal did not change how much iron they absorbed, while chili lowered it by 38%.4
- Of 356 turmeric samples bought in markets in four South Asian countries, 14% had detectable lead, a pattern that pointed to lead chromate added as a color.5
Turmeric: the one real source
Turmeric is the underground stem, or rhizome, of Curcuma longa, a plant in the ginger family grown commercially in India and Southeast Asia.6
Turmeric is the main food source of curcumin. Pure turmeric powder averaged 3.14% curcumin by weight across the products tested, so 1 g of the spice holds roughly 31 mg.1
Curry powders, with one exception, had much less curcumin than pure turmeric powder, and the amount varied widely between products.1
Our sources give no curcumin figure for fresh turmeric root, turmeric tea or golden milk, so we give none. A number quoted for them does not rest on the analyses we read.1
How much spice it takes to match a studied amount
Because the spice is about 3% curcumin by weight, it is simple arithmetic to ask how much of it equals the curcumin in a study. The table uses the 3.14% average, so it shows an order of magnitude, not a measurement of your jar.1
| Curcumin studied | Pure turmeric powder that holds it |
|---|---|
| 80 mg a day, in an absorption-enhanced product | About 2.5 g |
| 180 mg a day, in an absorption-enhanced product | About 5.7 g |
| 500 mg | About 16 g |
| 2 g, the amount given with and without piperine | About 64 g |
The comparison is about amounts only. Curcumin from the spice is the plain kind, and plain curcumin alone was barely detectable in the blood after 2 g, so the spice does not match what an absorption-enhanced product delivers.3
Curcumin as a food color
Curcumin is also used as a yellow food color, E 100, authorized in Europe in 57 food categories, though most food samples tested had too little to detect.2
Colour use is a different route to the same compound. EFSA's check of how much people take in from the color found adult intakes below its acceptable daily intake, and the dosage page explains that allowance.2
Turmeric in a meal
In 10 healthy young women, 0.5 g of turmeric powder in a rice meal did not change how much iron they absorbed from it.4
The test also showed why the comparison is useful: the same meal with chili absorbed much less iron, so a spice cannot be assumed to behave like its neighbours. Only one amount of turmeric was tested, in one rice meal.4
What to know about buying spice
Some turmeric spice sold in South Asia has been adulterated with lead chromate to brighten its color: 14% of 356 market samples from four countries had detectable lead.5
That survey sampled bazaars in India, Pakistan, Sri Lanka and Nepal. It does not tell us what is on shelves elsewhere, but it is why we do not regard any loose spice as a guaranteed clean source.5
NCCIH's pregnancy warning is about turmeric supplements. For breastfeeding it says little is known about amounts greater than those commonly found in food. Ask your doctor or midwife if you are unsure how much of the spice is reasonable.6
Supplemental turmeric raised urinary oxalate in healthy adults, which the researchers said could raise the risk of kidney stones in people prone to them.9
Questions people ask
Which foods are highest in curcumin?
Turmeric powder, at 3.14% curcumin by weight on average in one analysis. Curry powders held much less. We found no analysis of other foods, so we name none.1
Does curry powder contain curcumin?
Most of it does, but far less than pure turmeric powder, and the amount varied widely between products. One curry powder in the analysis was an exception.1
Is the curcumin in food absorbed?
Plain curcumin is poorly absorbed: after 2 g alone, blood levels in healthy volunteers were undetectable or very low. We found no study that measured curcumin absorption from a meal.3
Is it a concern to eat turmeric during pregnancy?
NCCIH says turmeric supplements may be unsafe in pregnancy. Its warning names supplements, not the spice in food, and it sets no amount for food. Ask your doctor or midwife if you are unsure.6
See what we make
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Sources
- Tayyem RF, Heath DD, Al-Delaimy WK, Rock CL. Curcumin content of turmeric and curry powders. Nutr Cancer. 2006;55(2):126-131. Opened 2026-10-07.
- European Food Safety Authority. Refined exposure assessment for curcumin (E 100). EFSA J. 2014;12(10):3876. Opened 2026-10-07.
- Shoba G, Joy D, Joseph T, et al. Influence of piperine on the pharmacokinetics of curcumin in animals and human volunteers. Planta Med. 1998;64(4):353-356. Opened 2026-10-07.
- Tuntipopipat S, Judprasong K, Zeder C, et al. Chili, but not turmeric, inhibits iron absorption in young women from an iron-fortified composite meal. J Nutr. 2006;136(12):2970-2974. Opened 2026-10-07.
- Forsyth JE, Mistree D, Nash E, Angrish M, Luby SP. Evidence of turmeric adulteration with lead chromate across South Asia. Sci Total Environ. 2024;949:175003. Opened 2026-10-07.
- National Center for Complementary and Integrative Health. Turmeric. Bethesda (MD): National Institutes of Health. Last updated April 2025. Opened 2026-10-07.
- Cox KHM, White DJ, Pipingas A, Poorun K, Scholey A. Further Evidence of Benefits to Mood and Working Memory from Lipidated Curcumin in Healthy Older People: A 12-Week, Double-Blind, Placebo-Controlled, Partial Replication Study. Nutrients. 2020;12(6):1678. Opened 2026-10-07.
- Small GW, Siddarth P, Li Z, et al. Memory and Brain Amyloid and Tau Effects of a Bioavailable Form of Curcumin in Non-Demented Adults: A Double-Blind, Placebo-Controlled 18-Month Trial. Am J Geriatr Psychiatry. 2018;26(3):266-277. Opened 2026-10-07.
- Tang M, Larson-Meyer DE, Liebman M. Effect of cinnamon and turmeric on urinary oxalate excretion, plasma lipids, and plasma glucose in healthy subjects. Am J Clin Nutr. 2008;87(5):1262-1267. Opened 2026-10-07.
This page is information, not medical advice. Talk to your doctor or pharmacist about your own situation.