Product Information Give your skin the treatment it deserves with the anti-aging Pure C Mixing Crystals. Enriched with 100% pure L-ascorbic acid, these CosMedix anti-aging crystals readily blends with your skin to give a smooth, radiant and natural finish. The presence of Vitamin C in the form of L-ascorbic acid in this CosMedix facial treatment advances the building process of protein (i.e., collagen and elastin). The Pure C Mixing Crystals not only help making your skin soft and supple.