The 111SKIN Y Theorem Repair Serum is a powerful age-defying skincare product that contains hyaluronic acid as its active ingredient. This serum, packaged in a 1 fl oz bottle, is designed for daily use on the face. With its focus on skin repair, this product is perfect for those looking to combat signs of ageing and achieve a more radiant complexion. The Y Theorem Repair Serum from 111SKIN offers a high-quality formulation that is suitable for both men and women.