Turmeric

EVIDENCE: MODERATE

Also sold as: Curcuma longa, curcumin, turmeric extract, BCM-95, Meriva, Theracurmin

Curcumin research includes knee osteoarthritis and maintenance of ulcerative-colitis remission. Absorption is poor, so trials commonly use enhanced-absorption extracts or gram-level standardized preparations. Ordinary turmeric root powder does not automatically match that evidence.

Compiled by iSupplementReviews editorial team ·Updated 2026-10-06 · 4 sources

Type: Botanical (anti-inflammatory polyphenol)
Studied dose: 500–2,000 mg/day curcumin extract (95% curcuminoids) or enhanced-bioavailability forms; root powder is ~3–5% curcumin
Best form: Standardized 95% curcuminoid extract or a named bioavailable form (Meriva, BCM-95, Theracurmin) — the trials' material
Upper limit: No established upper intake limit — high doses cause digestive upset; rare liver-injury case reports exist with enhanced-absorption extracts
Our rating: MODERATE — Several human trials — limits in size, duration, or independence

What is turmeric?

Turmeric is Curcuma longa, the yellow spice whose root contains about 3–5% curcumin. Curcumin has substantial human research but poor absorption. Trials therefore often use concentrated or enhanced-absorption preparations rather than ordinary root powder.

What does the research show?

Claim	Evidence	Dose studied	Verdict
Knee-osteoarthritis pain	Systematic review/meta-analysis of trials	~1,000–2,000 mg/day curcumin	Supported — modest, real
Colitis remission maintenance (add-on)	RCT (Lang 2015, n=50)	3 g/day curcumin	Positive — add-on
Anti-inflammatory mechanism	Established (NF-κB, COX pathways)	—	Established
‘Detox’/liver claims	No outcome studied	—	Unproven
Oral/dental benefit	No human outcome data	—	Unproven

What dose was studied?

Goal	Dose	Form
Joint pain	~1,000–2,000 mg/day curcumin	extract/enhanced forms
Colitis remission	3 g/day curcumin	standardized capsules
Label reality check	~5–10 mg curcumin per 50 mg root	plain root — the weakest form

Side effects

Well tolerated at food amounts; extract doses cause digestive upset in some. Rare liver-injury case reports exist, notably for high-absorption products (the FDA has flagged the pattern). It also stimulates gallbladder contraction.

Drug interactions

Blood thinners: mild blood-thinning activity; the standard caution.
Gallbladder disease: gallstones or duct obstruction is a real contraindication.
Piperine-enhanced products: piperine deliberately blocks drug-metabolizing enzymes; it can raise levels of co-administered drugs.

Who should not take it

Gallstone patients, people on blood thinners without clinician awareness, and, at extract doses, anyone with unexplained liver-enzyme elevations.

What the authorities say

MSKCC notes anti-inflammatory activity with insufficient evidence for most marketed uses; NCCIH echoes: positive for some conditions, not the universal cure it’s sold as.

What to know about turmeric

Curcumin findings depend on form, absorption, and dose. Small amounts of turmeric root in a blend do not match concentrated-extract trials. The evidence for joint or bowel outcomes also does not establish dental benefits.

Frequently asked questions about Turmeric

Does turmeric work for inflammation?

At extract doses, there is real evidence. Systematic reviews of knee-osteoarthritis trials find curcumin reduces pain scores comparably to some NSAIDs in short trials, and a placebo-controlled trial showed curcumin as an add-on helped maintain ulcerative-colitis remission. But the trials used 500–2,000 mg of curcumin; you'd need 10–40 grams of kitchen turmeric to match it.

Why do they say turmeric 'doesn't absorb'?

Because it's true: curcumin is broken down rapidly on first pass through the body, so blood levels after plain turmeric are barely measurable. The entire enhanced-form market (piperine combos, phospholipid forms, nanoparticles) exists to solve this. A label that says 'turmeric (root)' with no extract % or absorption form is selling the least-studied version of the ingredient.

Turmeric vs curcumin — what's the difference?

Turmeric is the root (the food); curcumin is the ~3–5% active fraction inside it. The trials are on curcumin. 'Turmeric 500 mg' delivers ~25 mg of curcumin, an order below the doses where the trials live.

Why is turmeric in a dental supplement?

'Anti-inflammatory' is the bridge: real curcumin pharmacology transplanted into a formula where it sits in a 571 mg blend shared with 12 other items. Its share is likely tens of milligrams of unstandardized root, statistically invisible against the gram-level trial doses.

Is turmeric safe?

Food-level, completely. Extract-level, mostly, with two real flags: high-absorption extracts carry rare case reports of liver injury (the FDA has acknowledged these), and turmeric stimulates the gallbladder, a caution for people with gallstones.