Vitamin C is a widely used product that has been used in skin care for many years, it has been used as a preservative and an antioxidant and has been marketing as the ingredient that will rebuild your collagen. Regardless of why it is in our skin care, it’s extremely beneficial when applied topically. One if the most interesting developments with Vitamin C is its proven effectiveness when used for Malasma (dark Spots and patches on the face).
Melasma can be caused from sun exposure, hormone levels, perfume, or even genetics.
Many sources site that with a vitamin C strength of at least 10% concentration you can get very effective lightening. It can suppress the pigment cells from re-darkening the skin.
People with sensitive skin should check with their skin care specialist before using high levels of vitamin c and because it is acidic you may get some reddening and or peeling of the skin.