Stay-C50 is a stable vitamin C that works as an anti-oxidant to protect the skin from the damaging effects of free radicals. Vitamin C also plays a role in even skin tone by reducing the production of melanin by the melanocytes.

L-Lactic acid is a low irritant and assists with pH balance of the skin. It also plays a role in even skin tone.
Glycolic acid plays a role in improving the appearance of sun damaged skin reducing the appearance of aged skin.Glycolic acid promotes the cycle of skin shedding (also known as cell turnover) and re-growth of new skin cells.
Niacinamide (vitamin B3) plays a role in reducing skin blemishes and acne as well as improve skin tone. Viacinamide seems to reduce the appearance of wrinkles by decreasing the rate at which collagen is broken down in the cells.
Kaolin helps to absorb excess oils and sebum.