Niacinamide (Vitamin B3)

Niacinamide, a non-flushing form of vitamin B3, supports joint and skin health and promotes restful sleep.* It has also been shown to protect bet

We carry Niacinamide (Vitamin B3) because independent batch testing for purity and potency, nsf-certified manufacturing, and a research division that publishes actual clinical data — that's the bar we hold supplement brands to, and thorne is one of the few consumer-facing companies that clears it.

We slot this into our skin shelf because the inside-out approach genuinely works: skin barrier and collagen synthesis depend on a handful of nutrients that most modern diets under-deliver. Thorne's bioavailable forms absorb noticeably better than the cheaper oxide and ascorbate variants used by drugstore brands.

Use the link on this page to get 10% off through our Thorne affiliate partnership. The code applies automatically when you click through — same Thorne, same shipping, just a small kickback to us at no cost to you.