Hyaluronic acid toner is a product that contains hyaluronic acid, a natural polysaccharide found in connective tissues such as cartilage. Hyaluronic acid acts like a sponge to hold up to 1000 times its weight in water, making it essential for continuous hydration and a plump, smooth complexion. Hyaluronic acid toner can be used to restore an even skin tone, reduce the appearance of dark circles, and support the skin barrier. Positive aspects of hyaluronic acid toner include its ability to hydrate and plump the skin, while negative aspects may include potential allergic reactions to the ingredient. Hyaluronic acid toner products may contain other ingredients such as water, glycerin, squalane, cyclodextrin, sorbitol, and jojoba seed oil.