Ultraviolet radiation will accelerate the production of free radicals, and in the daytime with sufficient ultraviolet rays, free radicals are the most rampant, so it is more necessary to resist oxidation during the day than at night.

Vitamin C is a natural antioxidant, which blocks the transmission of melanin and inhibits the production of melanin, thus effectively protecting the skin. However, the nature of vitamin C is very lively and unstable. If exposed directly to ultraviolet light, it is easy to lose its activity. Therefore, the best solution is to use VC skin care products after strict sun protection.

Precautions for early C and late A:

1, suitable for people: Vitamins C and A are irritating to some extent, and the skin needs to be tolerant of them before use. Therefore, this formula is not suitable for sensitive people such as sensitive muscles, skin damage and pregnant women.

2. How to match: When vitamin C and vitamin A are matched, we must pay attention to the time point in the morning and evening when using them. Do not mix these two essences, and avoid mixing them with products containing other irritating ingredients, such as fruit acid and salicylic acid.

3. Selection of concentration: Generally speaking, the concentration of vitamin C does not exceed 20%, and the concentration of vitamin A does not exceed 1%. At the beginning, try from a low concentration to avoid excessive skin irritation.