Neocutis Bio Serum Firm is the only Human Growth Factors + Proprietary Peptides anti-aging formulation with proven results in less than a week. This product provides next-level anti-aging support to minimize the appearance of fine lines and wrinkles, refines texture, brightens skin tone, improves firmness and elasticity, and boosts hydration as soon as 6 days. How is Bio Serum Firm different from the original Bio Serum and Micro Serum? Bio Serum Firm contains the same high concentration of Human Growth Factors as Bio Serum to support collagen, diminsh the appearance of fine lines and wrinkles, and redefine the look of facial contours for a more youthful appearance. In addition, Bio Serum Firm includes the same percentage of Proprietary Peptides as Micro Serum to support collagen and elastin restoration and address the complex signs of aging, including firmness, elasticity, tone, and texture.