L- Ascorbic acid polypeptide complex is a water stable, soluble form of Vitamin C, which is able to penetrate the outer layers of the skin. Upon topical application and under suitable conditions, it can penetrate into the deeper layers of the epidermis where the melanocyte cells are located. These cells produce the protective brown pigment, melanin, on exposure to actinic (UV) light. L-Ascorbic acid, if present in sufficient concentration, reduces melanin to a colorless substance, inhibiting the formation of freckles, excessive darkening of the skin, "age spots" and possible pre-cancerous lesions such as melanomas. L-Ascorbic acid is one of the protective substances which are involved in the capturing, or neutralizing of free radicals formed upon exposure to UV radiation.

Vitamin C+ has a pronounced toning and firming effect on the skin, making it suitable as an ingredient in cosmetics intended for use in the vicinity of the eyes (reduction of puffiness, etc.) as well as skin care products for aging and mature skin. Due to its melanin reducing properties, Vitamin C+ can improve the appearance of freckled complexions, age spots and discolored skin areas.
The vitamin in nature is always conjugated with water-soluble proteins or polypeptides and generally occurs in conjunction with related compounds, the bioflavonoids. The conjugated (polypeptide-bound) form of Vitamin C is approximately 10 times more effective than synthetic Vitamin C.