ZO GROWTH FACTOR SERUM — new, never used. One of my favorite products but I recently switched to a prescription program. Growth Factor Serum integrates plant and enzymatically derived growth factors with an exclusive protein complex, clinically proven to achieve a superior restoration of visible skin thickness, elasticity, smoothness + suppleness. Clinically proven to improve the appearance of skin thickness + elasticity Restores the look of more supple, hydrated skin Temporarily reduces the look of expression lines Results in skin that appears 6 years younger after 12 weeks*