This exclusive formulation of DR. BARBARA STURM The Good C Vitamin Serum is crafted with an optimal 5% concentration of Vitamin C complex to impart a radiant, youthful appearance. Zinc is added to maximize Vitamin C absorption, leaving skin more even in tone and texture while promoting anti-oxidative protection. Indulge in the elegance of a luxe serum and experience the premium benefits of this indulgent formulation.