Catalase 15,000 - Rise-N-Shine's "Simply Catalase" Antioxidant Enzyme is now available in ONE potent easy to swallow capsule, with 15,000 IU'S OF CATALASE in ONE CAPSULE! This makes our product one of the most POWERFUL and POTENT CATALASE ANTIOXIDANT ENZYMES on the market! 30 Day Supply Catalase 15,000 is a vitamin supplement that contains 15,000 units of the enzyme Catalase to help your body replenish the Catalase Enzyme, which slowly depletes as we age. Hydrogen peroxide is naturally produced by the body, so when catalase levels decline, the hydrogen peroxide can no longer be broken down - which can age hair from the inside out. This can result in weaker, aging hair.