Catalyst Plus uses a more stable, time released form of Vitamin C, doubled it in strength and added soothing aloe. You now have a lighter version of Catalyst in the convenience of a pump that can be used on the most sensitive of skin. It repairs DNA damage and assists in the production of proteins and antioxidants within the cell by utilizing the same patented Zinc Finger Technology™ of Catalyst. This combination of amino acids, copper and zinc improves wound healing, lightens hyperpigmentation, reduces visible capillaries and stimulates collagen and elastin production just as effectively as Catalyst but is gentler to the skin. Gluten free and vegan.