What does "standardised extract" mean?
A standardised extract contains a defined, tested share of an ingredient, for example 95 % curcuminoids. Plants vary from harvest to harvest, and standardisation evens this out. Every batch then contains the same amount of the active compound.
Standardised extract explained simply
With a natural product, nothing is ever identical: sometimes the plant got a lot of sun, sometimes a lot of rain, sometimes it was harvested too early or too late. The content of its constituents therefore varies. In a standardised extract, the content of the desired compound is specified and tested in every batch. "Standardised to 95 %" means: whatever the harvest was like, the product ends up containing around 95 % curcuminoids.
Turmeric spice powder, by contrast, is not standardised. It contains only about 2 to 5 % curcumin, and the value fluctuates.
Powder versus standardised extract
Typical orders of magnitude from the comparison article.
| Feature | Turmeric powder | Standardised extract |
|---|---|---|
| Feature Curcumin content | Turmeric powder about 2 to 5 %, fluctuating | Standardised extract usually 95 % curcuminoids |
| Feature Typical amount in practice | Turmeric powder 1 to 5 g per day (kitchen) | Standardised extract 500 to 1,000 mg per day |
| Feature Consistent composition | Turmeric powder No | Standardised extract Yes, tested per batch |
| Feature Use | Turmeric powder Cooking and enjoyment | Standardised extract Targeted curcumin intake |
How is it checked?
A laboratory measures the content with an analytical method, usually HPLC, a technique for separating and measuring individual compounds. The result appears in the batch's certificate of analysis. Reputable manufacturers make it available. A label saying only "turmeric extract" tells you nothing about the content; what matters is what it was standardised to and how that is documented.
What standardisation does not mean
- Not automatically better absorption: even a 95 % extract is absorbed poorly without further technology. That concerns bioavailability and is a separate topic.
- No proof of effect: standardisation says what is in it, not what it does.
- Not legally uniform: the term is not strictly defined for food supplements, which is why verification by a certificate matters.
One plus is purity: standardised extracts are usually purified and contain hardly any of the root's accompanying compounds such as oxalates.
Why does the content of turmeric vary at all?
Turmeric is a natural product. Variety, soil, climate, harvest time, drying and storage all influence how many curcuminoids the root contains. Two packs of powder can therefore differ greatly without you being able to smell or see it. For someone who wants to take a specific amount of curcumin this is a problem: the dose on the spoon is not reliable.
How a standardised extract is made
First the curcuminoids are dissolved out of the root powder with a solvent such as ethanol or with CO₂. Starch and fibres stay behind. The concentrate is purified and dried. A laboratory then measures the content and the manufacturer adjusts it to the target value, for example 95 %. In this way different raw-material batches can be brought to the same specification.
Frequently asked questions
How does this differ from a "turmeric extract" without standardisation?
An extract without a defined content can fluctuate greatly. Only the statement "standardised to …" together with a test value makes it comparable.
Does 95 % curcuminoids mean 95 % reaches the body?
No. The value describes the content in the product. How much of it reaches the blood depends on the formulation (keyword bioavailability).
Is a standardised extract always better than powder?
It depends on the goal. For cooking, powder is ideal. If you want to take a defined amount of curcumin, a tested extract serves better because content and purity are traceable.
Ask for a percentage figure and for the batch's certificate of analysis. If both are missing, the content remains a claim.
