Mechanism of Action of Fruit Acid Skin Change
Fruit acid skin change is a commonly used means of beauty and skin care. One of its core components is glycolic acid. Glycolic acid, as an alpha-hydroxy acid, plays a key role in fruit acid skin change. The mechanism of action is described in detail below.

First, the metabolism of the stratum corneum
Glycolic acid molecules are relatively small, have good hydrophilicity, and can easily penetrate into the stratum corneum. The stratum corneum is composed of multiple layers of flat keratinocytes, which are connected by keratinocytes. Glycolic acid can weaken the connection of keratinocytes and promote a decrease in the adhesion between keratinocytes. In this way, the originally tightly arranged keratinocytes can be shed more smoothly, accelerating the metabolism of the stratum corneum The normal skin stratum corneum replacement cycle is about 28 days. After the action of glycolic acid, this cycle can be moderately shortened, so that the skin surface is always maintained in a relatively young and healthy state, showing a smoother and more delicate texture.

Second, stimulating collagen synthesis in the dermis
Although glycolic acid mainly acts on the epidermis, it can also have a positive impact on the dermis at a suitable concentration. When glycolic acid penetrates into the junction area between the epidermis and dermis, it will stimulate fibroblasts. Fibroblasts, as key cells in the dermis responsible for synthesizing extracellular matrix components such as collagen and elastic fibers, are significantly enhanced after being stimulated by glycolic acid. Fibroblasts accelerate the synthesis of type ⅰ and type ⅲ collagen, which are important substances for maintaining skin elasticity and firmness. With the increase of collagen content, the elasticity of the skin can be improved, fine wrinkles can be improved, and the overall appearance is fuller and younger.

Third, improve the hydration ability of the skin
The hydroxyl groups in the glycolic acid molecule have strong hydrophilicity and can combine with water molecules. In the process of fruit acid skin replacement, glycolic acid on the one hand promotes the renewal of the stratum corneum, so that the new keratinocytes are arranged more tightly and orderly, and enhances the barrier function of the stratum corneum; on the other hand, its own hydrophilicity can absorb more water and increase the water content of the stratum corneum. These two aspects work together to improve the skin's hydration ability, keep the skin hydrated, improve dryness, roughness and other problems, and make the skin show a moisturizing luster.

In summary, glycolic acid has achieved a variety of cosmetic effects on the skin by regulating the metabolism of the stratum corneum, stimulating collagen synthesis in the dermis, and improving the skin's hydration ability. It provides an effective means for many people who pursue good skin condition.