XCell B serum contains 21% niacinamide to deliver maximum levels of vitamin B3 to the target cells of the epidermis and dermis. This will result in an improvement to barrier function, skin immunity, tone and texture, hydration levels, and collagen production for fine lines and firmness. Containing Superoxide Dismutase (SOD) a bioidentical super antioxidant that protects the skin from solar and environmental damage. It soothes the skin, helps combat photo-ageing and neutralises free radicals, leaving the skin healthy and more radiant.