Turmeric
Carried in 5.3% of Iceland's products. Most often listed in butter chicken without side dishes (86% of products in that category list it).
Turmeric · health claims, ranked by evidence
Turmeric is one of the most-studied culinary spices, almost entirely because of curcumin — its main polyphenol. The catch: curcumin is poorly absorbed without help (often combined with piperine from black pepper or a fat carrier in trial protocols). Be careful comparing 'turmeric' research to 'curcumin extract' research; they're not the same thing.
Meta-analyses of curcumin-extract supplementation suggest a modest reduction in osteoarthritis pain over 8–12 weeks, comparable to lower-dose NSAIDs in some trials. Effect is for the extract, not for cooking with raw turmeric powder. Trials are mostly small.
Small RCTs in rheumatoid arthritis report curcumin extract reduces tender/swollen joint counts and inflammatory markers (CRP, ESR). Adjunct, not replacement, for DMARDs. Sample sizes are limited; longer-term safety data are thin.
Some short-term trials suggest curcumin may improve memory in older adults; others find no effect. Alzheimer's-specific evidence is weak — animal data look interesting but human trials are inconclusive. Marketing for 'brain turmeric' supplements outruns the data.
Trials are split — some report reduced soreness 24–48 hours after exercise; others find no effect. Doses, formulations, and exercise types vary widely, making cross-trial comparison hard.
Some meta-analyses report small reductions in fasting glucose, HbA1c, or LDL; others find no clinically meaningful change. Effects are modest at best and likely don't replace metformin or statins for people who need them.
Cell-culture and animal studies show curcumin has interesting properties; human clinical evidence for cancer prevention or treatment is not there at the doses humans can practically absorb. Be skeptical of any source making this claim.
- Bioavailability is famously low — most trials use curcumin extract with piperine (black pepper) or a fat carrier. Cooking with turmeric powder delivers far less.
- May interact with anticoagulants (warfarin, aspirin) — consult your pharmacist if you're on blood thinners.
- High-dose extract supplementation has occasionally been linked to liver-enzyme elevations; rare but real.
- Pregnancy: culinary use is widely considered safe; high-dose extracts during pregnancy lack adequate safety data — talk to your midwife.
This is editorial summary, not medical advice. Always speak to a qualified healthcare professional before changing diet or supplements, especially if you're pregnant, on medication, or managing a health condition.Last hand-reviewed: 2026-04-30
