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Skincare routines can be overcomplicated, which is why we invented the CSA Philosophy; the secret to glowing, youthful skin. CSA stands for Vitamin C + Sunscreen by day and Vitamin A by night. Follow these 3 steps to address 90% of anti-ageing skincare needs* * Based on average change in key indicators of skin ageing, in a clinical study on 63 participants using a CSA skincare regime over 12 months