THE SUBSTANCE™ MASTER C SERUM is a clinical-grade vitamin C serum powered by stabilized 3-O-Ethyl Ascorbic Acid and a proprietary architecture of patented antioxidant and skin-recovery technologies. Developed for skin exposed to the extreme demands of the modern environment, MASTER C targets the appearance of uneven skin tone, dark spots, redness, UV-induced fatigue, dehydration, and the visible signs of photoaging. Fragrance-Free and Unscented. Designed for sensitive skin.
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