Evidence Level
Curcumin is one of the most studied natural compounds in PubMed, with over 17,000 published papers. The clinical evidence is strongest for joint health: Daily et al. (2016) conducted a definitive meta-analysis of 8 RCTs concluding that curcumin (~1000mg/day) was comparable to ibuprofen for arthritis symptom relief with a superior GI safety profile. For bioavailability, the landmark work by Shoba et al. (1998) demonstrated a 2000% increase in curcumin absorption with piperine co-administration, while Cuomo et al. (2011) showed Meriva phytosome achieved 29-fold higher plasma curcumin than unformulated extract. In neurological research, Small et al. (2018) published a rigorous 18-month RCT in the American Journal of Geriatric Psychiatry demonstrating that Theracurmin improved memory, attention, and mood while reducing amyloid and tau deposition on brain PET scans — one of the first supplement trials to show such imaging biomarker changes. Hewlings & Kalman (2017) published a comprehensive review in Foods covering curcumin's mechanisms including NF-kB inhibition, COX-2 suppression, and Nrf2-mediated antioxidant upregulation.