Vitamin C along with hyaluronic acid has become the latest trending skin care ingredient. Kiehl's Vitamin C is one of the products in the market with 10% vitamin C concentration. Vitamin C is great at reducing pigmentation, induces collagen production, protects skin from sun rays, fight breakouts, exfoliating the skin and improving the hydration levels of skin to a certain extent. It is applied before sunscreen to boost the protection and in the night to improve skin quality. If used alone, … [Read more...] about Kiehl’s Vitamin C Powerful Strength Line Reducing Concentrate Serum