What type of skin care products are better for dry and dehydrated skin? At present, the safest, most natural, most mainstream and most effective ingredient to solve dry skin and keep skin hydrated is hyaluronic acid. A. What is hyaluronic acid? Hyaluronic acid is a linear mucopolysaccharide-like macromolecule inherent in the human body, which is the most important material basis for the skin to maintain moisture, elasticity and luster. Hyaluronic acid’s ability to retain water is amazing, it can lock up to 1000 times its own water, and is also known as “moisturizing gold” in the beauty industry. At the same time, the content of hyaluronic acid (HA) in the human body will gradually decrease with age: the skin in infancy is rich in hyaluronic acid, soft and elastic; after the age of 25, hyaluronic acid begins to lose; at the age of 30, only 65% of the young age is left; at the age of 60, only less than 25% is left. After the loss of hyaluronic acid, the water content of the skin dermis decreases, and the skin gradually loses its elasticity and luster, while the damage to the sun and the environment and the skin’s ability to repair itself also gradually decreases, resulting in fine lines, wrinkles and dark spots. The efficacy of hyaluronic acid: 1, long-lasting moisturizing: rapid penetration into the deep layers of the skin, immediately moisturize the skin, plump moisture long-lasting moisturizing, so that the skin to return to the fullness of the full, anytime and anywhere in the comfort of the full. 2, delicate and soft skin: provide a constant source of water for the cells, while combining with the collagen and elastic fibers in the skin, can help the skin epidermis to maintain a new live renewal (metabolism) frequency, so that the skin surface cells closely aligned, reduce pores, smooth skin. 3.Smoothing fine lines: Hyaluronic acid grabs a large amount of water and wraps around collagen fibers and elastic fibers, so that they get a lot of water, collagen fibers and elastic fibers can be fully stretched, and the skin can maintain good elasticity and present a smooth and soft state. Hyaluronic acid can also stop the production of some enzymes in cells, reduce the formation of free radicals, and reduce the degradation of collagen fibers and elastic fibers. 4.Wake up cell vitality: Hyaluronic acid can quickly penetrate into the deep layer of the skin and wake up the vitality of the dry and dehydrated cells in the basal layer, making the cells in the basal layer full and plump, providing comprehensive protection for the skin continuously and helping the skin to resist the infringement caused by free radicals from various external pollution. 5, scar repair: Hyaluronic acid facilitates the metabolism of nutrients and the migration of epidermal cells, thus helping the skin to repair damage and reduce scars. Hyaluronic acid can promote the proliferation and differentiation of epidermal cells and scavenge oxygen free radicals, which can prevent and repair skin damage. Third, what are the efficacy characteristics of cosmetics containing hyaluronic acid ingredients? 1.Thousands of times to lock water intelligent moisturizing 2.Three-dimensional moisturizing effect lasting 3.Promote the skin without scar repair 4.Unique multi-protection effect 5.Softening keratin, skin feeling smooth