This serum is ideal for all skin types, especially sensitive, sensitized, breakout-prone skin. Skin that's sensitive to vitamin C can tolerate it with gradual introduction. In this formula, next-generation derivatives are stable, delivering 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 target and slow the aging process. C-Therapy serum is essential oil and microbicidal preservative-free, making it safe for even the most allergy-prone, sensitive skin, and can be used day and night. Great alternative to retinol for women who are pregnant!