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We carry five different strengths for different skin types: Vitamin C 10%- for sensitive skin, Vitamin C 15%- for dry skin, Vitamin C 20%- for all skin types, Vitamin C 25%- for oily or mature skin or skin with clogged pores, and High Potency Vitamin C 25% pH 4.5- for extremely sensitive skin (those too sensitive for pH 3.5). Many leadings scientists highly recommend applying vitamin C onto the face daily to protect your skin. Vitamin C has many other beneficial properties, including being one of the few ingredients that has a scientific base to show that it reverses signs of aging for your skin. Vitamin C (L-Ascorbic acid) has been shown to stimulate collagen, decrease wrinkle depth, and have lightening effects on pigmentation. Hyaluronic acid, also known as HA, is a natural compound found in skin that has many important functions, including holding in moisture, providing cushioning, and holding together the skin's structural components (collagen and elastin). Vitamin C Serum 25% with pure hyaluronic acid is effective at moisturizing skin cells, which prevents water loss and protects the skin from dirt and other pollutants. Hyaluronic acid delivers AND holds water in the skin. Hyaluronic acid based products are considered extremely safe. We keep our product for topical use only so as to reduce the chances of this!