10% VITAMIN C SERUM. Benefits: A 10% vitamin C serum thats shown to visibly brighten, firm, and target the look of dark spots. 10% L-ascorbic acid, the purest form of vitamin C, is powered by a waterless technology for maximum stability and potency until the very last drop.. 1% alpha-arbutin and ferulic acid visibly even skin tone and reduce the look of hyperpigmentation, while upcycled tangerine peel hydrates and boosts moisture without irritation.. This formula is both water-free and oil-free. The primary base is Propanediol, although it's not an oil, it feels similar in texture and dries down to provide a unique, silky-smooth feeling on the skin.. Key Ingredients: L-Ascorbic Acid 10%: visibly brightens, evens skin tone, and tightens the look of skin. Upcycled Tangerine Peel and Sugar Beet: hydrate and boost the skins moisture and visible radiance. Alpha Arbutin 1% and Ferulic Acid: target the look of dark spots and hyperpigmentation while enhancing the benefits of vitamin C. Research Results: Clinical Results: In a clinical study of the 10% Waterless Vitamin C Serum with 33 participants over 8 weeks, users reported:. Visibly brighter skin after 1 use. Serum was gentle on skin after use 2x daily. In a clinical study of 10% Waterless Vitamin C Serum with 33 participants based on 4-8-week improvement:. 16x improvement in size and intensity of dark spots. 2x improvement in skin tone evenness.