How much curcumin is in turmeric?
About 3%. A 1000mg turmeric capsule carries roughly 30mg of the active compound, while research uses 500mg to 2000mg. The word on the label decides which one you bought.
Short answer: around 3%. Turmeric root is roughly 2% to 5% curcuminoids, so a 1000mg turmeric capsule contains about 30mg of the compounds anything was ever tested on. Studies generally use 500mg to 2000mg of curcuminoids. One word on the ingredient line separates a product that can reach that from one that cannot.
Turmeric and curcumin are used interchangeably in marketing and they are not the same thing at all.
Root versus extract
Turmeric root powder is the spice. It is mostly starch, fibre and oils, with curcuminoids as a small fraction.
Curcumin extract is the concentrate, usually standardised to 95% curcuminoids. Same plant, roughly thirty times the active content by weight.
So two capsules can both say 1000mg and differ by a factor of thirty:
1000mg turmeric root powder about 30mg curcuminoids
1000mg curcumin extract (95%) about 950mg curcuminoids
The ingredient line tells you which you are holding. Look for the words extract and standardised, and for a percentage.
The second problem: it does not absorb
Even the concentrated version has a real obstacle. Curcumin on its own is absorbed poorly, so a large oral dose does not translate into a proportionally large amount reaching your blood.
The common answer is piperine, an extract of black pepper, usually included at around 5mg to 20mg. It slows the liver's processing of curcumin and raises how much survives. A curcumin product with no absorption aid is leaving most of the dose on the table.
Other formulations exist, phospholipid complexes and micellar preparations among them, and they will say so on the label because it is the expensive part of the product.
Reading a turmeric label in three steps
Is it root or extract? If the ingredient says "turmeric root powder", multiply the milligrams by about 0.03 to get your actual dose.
Is there a standardisation percentage? "Standardised to 95% curcuminoids" is a guarantee. No percentage means no guarantee.
Is there piperine or another absorption aid? If not, the number on the front overstates what you get regardless of which form it is.
Why the cheap tubs are cheap
A tub of 1000mg turmeric root powder is inexpensive because it is essentially the spice, and you can buy a jar of that for less in a supermarket. The extraction and standardisation is the cost, and it is also the entire difference between a supplement and a jar of curry ingredient.
What to do
- Find the curcuminoid figure, not the turmeric figure. If only the second is printed, the first is about 3% of it.
- Check for a standardisation percentage. Without one you are guessing.
- Look for piperine or a named delivery system. Absorption is the limiting step, so a product ignoring it has ignored the main problem.
Related reading: how much EPA and DHA is actually in fish oil and do collagen supplements work.
Verdict reads the label, not the reputation. Photograph the supplement facts panel and it pulls every dose, compares each against the amounts used in published research, and adds up your whole stack. It reports the arithmetic. It does not tell you what to take.
