500mg / capsule.
This form of vitamin B3 is different from Niacin. Niacin has cardiac and vascular benefits and helps with longevity but niacinamide has more mental benefits: lessens anxiety and stimulates the calming GABA receptors (https://weeksmd.com/2020/08/niacinamide-helps-lessen-anxiety/).
It also help with wear and tear osteoarthritis (https://weeksmd.com/2016/09/vitamin-b3-arthritis/)