Differences between fruit acid, hyaluronic acid and retinol
Fruit acid, hyaluronic acid and retinol are all commonly used ingredients in the field of skin care, but their characteristics, efficacy and applicable skin types vary.

Fruit acid is represented by glycolic acid, with small molecules and strong permeability. First, it has the effect of exfoliation, which can loosen the connections between keratinocytes, shed the aging stratum corneum, promote epidermal cell renewal, and make the skin smooth and delicate, such as improving acne and fading superficial pigmentation. Second, it can stimulate the synthesis of collagen in the dermis, enhance skin elasticity, and reduce wrinkles to a certain extent. However, fruit acid is highly irritating, especially in high concentrations. It can be used by people with sensitive skin, or cause skin redness, tingling, and desquamation. It is recommended to choose low-concentration products for initial use to gradually build tolerance.

Hyaluronic acid, also known as hyaluronic acid, has a powerful moisturizing function. It can absorb thousands of times its own moisture, replenish and lock moisture for the skin, improve skin hydration, and make the skin full and shiny. It is suitable for all skin types, especially dry skin, and can significantly improve dehydration. Because of its mildness, sensitive skin can also be used with confidence. However, the macromolecule hyaluronic acid only stays on the surface of the skin, moisturizing for a long time; although the small molecule can penetrate deeper, the moisturizing power is slightly weaker.

Retinol is a vitamin A derivative. It can accelerate epidermal cell renewal, promote collagen synthesis, effectively resist wrinkles, reduce fine lines and wrinkles, and improve skin firmness. It can also regulate oil secretion and improve acne skin. However, retinol is irritating, and may cause dry, peeling, and redness in the early stage of use. It needs to start with a low concentration and a small area, and gradually increase the dosage and frequency. Because of its photosensitivity, it is recommended to use it at night, and do a good job of sun protection after use.

In short, skin care ingredients should be selected according to their own skin type and needs. Hyaluronic acid should be used for dry skin; oily, acne skin, fruit acid or retinol can be considered; sensitive skin should be selected for mild products and tested before use. In this way, the ideal skin care effect can be achieved.