What is the difference between topical and needle-injected hyaluronic acid?

Hyaluronic acid is divided into many different types and uses according to different molecular weights. In principle, macromolecules are used externally and small molecules are used internally. The type for external use is the largest molecule. It has the property of blocking moisture and moisturizing, so many cosmetics will add this ingredient. Hyaluronic acid is highly compatible with body tissues, so it can be injected into the human body. Expert answer is oral hyaluronic acid effective? Can hyaluronic acid be used? What are the advantages of injecting hyaluronic acid for rhinoplasty? Is hyaluronic acid good for moisturizing? Which is better, hyaluronic acid or collagen? What should I pay attention to after hyaluronic acid injection? Hyaluronic acid is one of the components that make up the skin structure, just like fine sand in reinforced concrete. Hyaluronic acid is divided into many different types and uses according to different molecular weights. In principle, macromolecules are used externally and small molecules are used internally. The type for external use is the largest molecule. It has the property of blocking moisture and moisturizing, so many cosmetics will add this ingredient. Hyaluronic acid is highly compatible with body tissues, so it can be injected into the human body. Hyaluronic acid can be divided into two types: one is a larger molecule, which is used for cushioning and lubricating the knee joint; the other is a smallest molecule, which is used for subcutaneous or intradermal injection to fill in the soft tissue of depression or insufficient volume. For cosmetic purposes. Hyaluronic acid with a larger molecular weight is less likely to be absorbed by the body and more prone to side effects. Therefore, macromolecular hyaluronic acid for external use cannot be used for injection; hyaluronic acid injected into the knee joint can theoretically be used for skin beauty, but because of its larger molecular weight, There is a high chance of adverse effects, and it is recommended to choose small molecular weight hyaluronic acid for skin injection.

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