Designed to help dance Away Dark Spots and Fine Lines Our customers appreciate the silky texture of this serum, with many noting visible improvements to their skin, including a reduction in dark spots and fine lines, increased brightness, overall smoothness, and marked improvements for skin conditions like psoriasis. Our 15% L Ascorbic Acid Vitamin C Serum was formulated and made in Toronto with a team of cosmetic chemists and a PhD in microbiology to ensure the concentration of ingredients matched clinical trials shown to achieve the desired results. The effective range in most trials is 10-20% L-ascorbic acid, so we went with 15% to maximize effectiveness while minimizing skin irritation.