Curcumin, the primary bioactive compound in turmeric, inhibits NF-kappaB, the master transcription factor that drives expression of pro-inflammatory genes including those producing TNF-alpha, interleukin-1, and interleukin-6. This mechanism has been demonstrated in cell culture, animal models, and human clinical trials. A meta-analysis of 11 randomised controlled trials published in the British Journal of Nutrition found that curcumin supplementation significantly reduced CRP, interleukin-6, and malondialdehyde, a marker of oxidative stress.
The Bioavailability Problem and Its Solution
Curcumin is poorly absorbed from the digestive tract when consumed in isolation. Piperine, the compound in black pepper that gives it its heat, inhibits the liver enzyme that metabolises curcumin and increases its bioavailability by up to 2,000 percent. This is why traditional culinary uses of turmeric consistently involve its combination with black pepper, as in many South Asian dishes. Consuming turmeric in fat-containing dishes also improves absorption, as curcumin is fat-soluble.
Evidence for Arthritis and Joint Pain
Several randomised trials have compared curcumin to standard non-steroidal anti-inflammatory drugs for osteoarthritis and rheumatoid arthritis. A trial published in Phytotherapy Research found that curcumin produced pain reductions comparable to ibuprofen in knee osteoarthritis over eight weeks, with a significantly better tolerability profile. The effect sizes in these trials are clinically meaningful for a dietary compound.
- Add turmeric to cooked dishes alongside black pepper
- Golden milk: warm dairy or plant milk with a teaspoon of turmeric, quarter teaspoon of black pepper, and a teaspoon of coconut oil or ghee
- Add to scrambled eggs, soups, rice, and roasted vegetables
- Do not expect the same effect sizes from culinary amounts as from standardised curcumin supplements