What is Alpha Hydroxy Acid: it referred to as AHA, is present in a variety of natural fruit or yogurt in the active ingredient. The use of acid derived from the ancient Egyptian and Roman times, but the beauty of the skin effect has been found by Scott M.D from the United States and Chinese-American Dr. Yu Ruijin in 70's.
The role of acid: about the role of acid, respectively, from the perspective of both the epidermis and dermis. Acid acting on the epidermis, the skin cells by reducing the cohesion between the accelerated aging of skin cells fall off, increase the rate of epithelial cell metabolism, promote skin renewal but also makes the epithelial cells arranged in a more orderly, smooth cuticle then becomes and detailed. Meanwhile, the acid can make the pores around the keratosis embolism easy to fall off, and smooth hair follicles tube, effectively prevent pore blockage. The role of acid in the dermis layer, can stimulate hyaluronic acid, glycosaminoglycans, collagen and elastic fibers hyperplasia and re-arranged to increase the water content of the skin, the skin becomes firm and elastic, astaxanthin fine lines and wrinkles will follow reduced. In beauty products, only 3% used a low concentration of acid; moderate concentrations of acid used to freckle; more than 20% of high concentrations of acid can be used in the skin under the guidance of professionals. You should know the classification of these acid components:
The first generation of acid: glycolic acid, citric acid, mandelic acid. Glycolic acid to treat and repair the main, less suitable for prolonged use (eg 6 months), the authority proposed in the skin repair, the best switch to the second or third generation of acid products as long-term maintenance . Citric acid, with moisturizing, anti-oxidation, metabolism, skin, whitening, anti-aging and other functions, biotin the clinically proven to promote skin metabolism of citric acid in the same time, can significantly increase the dermal layer of the polysaccharide hyaluronic acid and DTPA content, so the skin becomes too thick, for photoaging skin has significantly improved efficiency. Mandelic acid, the only lipophilic acid, a high affinity with the skin, the stratum corneum and penetrate deeply into the skin easily play a role in some of melanin in the face of problems, including uneven skin tone, dull, dark spots, freckles, inflammation After pigmentation, etc., have a significant effect, which is of other acid can not be achieved.
The second generation of acid: gluconic acid. And the difference is that traditional acid, gluconic acid is a multiple water-based acid (PHA), in the chemical structure has four hydroxyl groups, the water with good ability to play excellent moisturizing effect. On the other hand, gluconic acid also combines the antioxidant, preventing damage to skin aging. In addition, in clinical trials also found that gluconic acid can also enhance the stratum corneum barrier function, glutathione which raise the cuticle of the external chemical stimulation of the defense capability, healthier skin. And compared to the traditional acid, gluconic acid does not stimulate very mild, very suitable for dry or sensitive skin, and atopic dermatitis, lees dermatitis, adult acne patients.
The third generation of acid: lactobionic acid. Set of repair, anti-aging, moisturizing, antioxidant, skin update for excellent efficacy in a variety of the most advanced acid.
On acid ingredients, you often ask: will stimulate the use of acid, peeling, an allergic reaction it? Traditional AHA glycolic acid, 80% of consumers will have a slight tingling, itching feeling, about a minutes, this feeling will disappear, because glycolic acid's molecular weight, the reasons for the low pH value, if persistent irritation, reddish should be disabled, so that the skin is back to normal, cosmetics material reduce the use of and frequency, such as 2-3 days, wiping once, until the establishment of tolerance of skin recovery after daily use, if consumers use the AHA glycolic acid, or can not meet, you can use a new generation of multi-water-based fruit PHA acid, both mild, moisturizing, anti-aging properties, the effect of long-term use and the effect of not only the traditional AHA glycolic acid the same and more benefits. Acid function is to reduce keratinocytes cohesion, so that old cells fall off, so there will be a slight scaling of feeling, and feeling very fine, if uncomfortable phenomenon, you may go dermatologist for proper diagnosis. Source:http://www.cosprm.com