Regular beauty medical institution. Generally, the hyaluronic acid stock solutions available on the market are non-cross-linked hyaluronic acid stock solutions with smaller molecular weights. However, the hyaluronic acid stock solutions from regular beauty and medical institutions have larger molecular weights and better effects. Therefore, genuine hyaluronic acid stock solutions must be purchased from regular beauty and medical institutions. Hyaluronic acid liquid can moisturize and replenish skin and increase skin elasticity. After injection on the face, it will help improve the symptoms of dull and rough skin. You should insist on applying facial masks in the morning and evening, and take hydrating and maintenance measures on your face to prevent collagen loss.