This serum is ideal for all skin types, especially sensitive, sensitized, breakout-prone skin. Skin sensitized to Vitamin C find that tolerance levels improve upon gradual introduction. Next generation derivatives are stable, yet deliver Vitamin C in its active form, l-ascorbic acid. The presence of l-ascorbic acid allows optimal collagen production, and provides antioxidant protection and skin brightening effects. Glutathione and alpha-lipoic acid protect mitochondria, increasing age-delay benefits. The serum is essential oil and microcidal preservative-free, making it safe for even the most allergy-prone, sensitive skin, and can be used day and night. This dual purpose serum protects by day and repairs at night, and is safe for use by all skin types. A good alternative to Retinol for pregnant women.