Turmeric

Turmeric is the dried rhizome of Curcuma longa, used in South Asian cooking for thousands of years and widely studied in modern research. Its primary bioactive compound, curcumin, has anti-inflammatory and antioxidant effects in laboratory and human studies. It's become one of the most popular supplements globally, with claims ranging from realistic to extravagant.

For osteoarthritis, several randomized trials and meta-analyses show curcumin supplementation provides modest pain relief — roughly comparable to ibuprofen in some studies, with fewer GI side effects. For inflammatory markers in healthy adults, the evidence is more variable. For broad claims like "boosts immunity" or "prevents cancer," the human evidence is much weaker than headlines suggest.

Evidence base for benefits

Strongest evidence: osteoarthritis pain reduction, with effects typically seen at 500–1000 mg/day of curcumin extract over 8–12 weeks. Moderate evidence: improved lipid profile, reduced markers of systemic inflammation in metabolic syndrome. Weak/uncertain: cognitive effects, cancer prevention, broad "longevity" claims. Note: dietary turmeric (a teaspoon in a curry) provides far less curcumin than supplements — for therapeutic doses, supplementation is needed.

Bioavailability and forms

Curcumin has poor oral bioavailability on its own. Standardized supplements use various formulations to improve absorption: black-pepper extract (piperine, often labeled "BioPerine" — increases absorption ~20-fold), phytosome formulations (Meriva), nanoparticle preparations. For culinary use, combining turmeric with fat and black pepper (a typical Indian curry) substantially increases curcumin uptake. Caveats: turmeric supplements can interact with blood thinners and may cause GI upset at high doses, and rare cases of liver injury have been reported with some supplement formulations.