Differences between Glycolic Acid and Retinoic Acid
Glycolic acid and retinoic acid are both commonly used in the field of skin care, but the characteristics, efficacy and application of the two are quite different.

Glycolic acid is a kind of fruit acid, with small molecules and good hydrophilicity. Its effect on the skin is to promote the metabolism of the stratum corneum. It can loosen the connection between keratinocytes, make the old waste keratin easier to fall off, make the skin surface smooth and delicate, brighten the skin tone, and unclog the pores, which can improve the acne, acne and other problems. Because it is relatively mild, most skin types can tolerate it, and it is also more suitable for initial users. However, when using, you need to pay attention to the concentration control. High concentrations of glycolic acid may irritate the skin, causing redness, tingling and other phenomena.

As for retinoic acid, a derivative of vitamin A, it plays a significant role in regulating cell growth, differentiation and metabolism. It can penetrate deep into the bottom layer of the skin, promote collagen production, reduce wrinkle production, improve skin texture, and has a good repair effect on photoaging skin. At the same time, retinoic acid has a regulatory effect on keratinization of the hair follicle sebaceous gland ducts, which can effectively treat acne. However, retinoic acid is highly irritating. In the early stage of use, the skin often appears dry, desquamation, redness and other discomforts. Sensitive skin should be especially cautious. When using, it needs to start with a low concentration and a small range to gradually build skin tolerance.

In summary, glycolic acid focuses on stratum corneum care and surface rejuvenation, which is relatively mild; retinoic acid focuses on deep skin repair and acne treatment, which is powerful but irritating. Users should choose carefully according to their own skin condition, needs and tolerance to achieve the ideal skin care effect.