Turmeric is one of the most studied botanicals in the joint-health category, and it's worth being precise about what that research actually shows.
Several clinical studies and reviews have reported improvements in pain or physical function among people with osteoarthritis using specific, standardized curcumin extracts, at defined doses over defined periods.
Those study results are specific to the extracts and doses used in that research — they don't automatically transfer to every turmeric product on the shelf. Claims that a supplement can "regenerate" or "restore" damaged cartilage go well beyond what curcumin research has actually demonstrated.
Turmeric is a genuinely reasonable ingredient to include in a joint formula. It is not a documented cure for cartilage damage, and any product claiming otherwise deserves skepticism.