YVOIRE hyaluronic acid, also known as hyaluronic acid, is an inherent component of the skin, and its function is to replenish water and moisturize. Hyaluronic acid is divided into three types: macromolecules, medium molecules and small molecules. High-molecular hyaluronic acid has a relatively high cross-linking degree, which is suitable for injection into the deep layer of the skin to make the skin plump; medium-molecular yvoire hyaluronic acid has a low cross-linking degree, which is suitable for filling tear troughs, lips or small horizontal wrinkles. The yvoire hyaluronic acid molecule can basically be understood as having no degree of cross-linking, and its main function is to moisturize and rejuvenate the skin