eCosmetics is an authorized retailer of Skin Research.Our Vitamin D Co-Enzyme Q10 & Vitamin D Serum is designed to improve the skin's texture and fight signs of aging. Vitamin D is a powerful skincare aid that reduces inflammation, protects the skin, and improves cell turnover. Combined with Q10, which acts as an antioxidant, it fights free radical stress and detoxes the skin. The serum is lightweight and can be used twice daily after cleansing and before moisturizing. It is important to always use SPF alongside Vitamin D and avoid mixing it with other AHA's and BHA's.