Turmeric & Curcumin
Turmeric, or more precisely its active compound curcumin, is taken by a lot of people for joints and general inflammation. The snag is that curcumin is poorly absorbed on its own, which is why the good ones add black pepper (piperine) or use a special formulation to help it get in. The evidence is promising rather than conclusive, but it is a popular, low-risk one to try.
Common questions
Why does turmeric need black pepper?
Curcumin is badly absorbed by itself. Piperine from black pepper boosts absorption dramatically, which is why most serious turmeric supplements include it. Without it, much of the dose simply passes through.
Does it help joint pain?
Some studies suggest curcumin may ease joint discomfort, with results that look encouraging but not definitive. Plenty of people rate it; just go in with realistic expectations.