The medical theory of the mixed use of glycolic acid and retinoic acid
is related to skin maintenance. The mixed use of glycolic acid and retinoic acid is often studied by everyone. The two have their own effects on the skin.

Glycolic acid belongs to the fruit acid category and has the effect of gentle exfoliation. It can loosen the old keratin on the surface of the skin, make the skin return to a smooth and delicate state, and can promote skin metabolism, stimulate cell vitality, and is quite effective in improving dull and rough skin tone.

Retinoic acid is a vitamin A derivative, which has a profound impact on skin cell differentiation, proliferation and metabolism. It can regulate the keratinization of hair follicles, prevent acne formation, and promote collagen synthesis, help skin elasticity recover, and slow down the process of skin aging.

However, when the two are mixed, caution is required. Glycolic acid causes the stratum corneum of the skin to thin, and skin sensitivity increases; retinoic acid also has the possibility of irritating the skin, making the skin reddish, desquamation, and burning. If the two are not mixed properly, the skin will be irritated or multiplied, causing skin inflammation and allergies.

If you want to mix, consult a professional first. The doctor weighs the pros and cons according to the individual skin type, such as dryness, oiliness, sensitivity, etc., and the specific skin diseases, and makes a reasonable plan. Or try it with low-concentration glycolic acid or retinoic acid first, observe the tolerance of the skin, and then gradually adjust the concentration and frequency of use. And at the beginning of mixing, the number of uses should be small, and it can be moderately increased when the skin adapts.

In short, the mixing of glycolic acid and retinoic acid may have synergistic skin care effects, but risks coexist. Adhering to a scientific and prudent attitude and following professional guidelines can protect the health of the skin and achieve the purpose of maintenance.