Viva Health Pure Hyaluronic Acid Serum - Most moisturizers last less than an hour, while Viva’s Pure Hyaluronic Acid Serum encourages your skin to retain its natural moisture from morning to night, leaving you with a beautiful complexion all day, every day. Hyaluronic Acid is a 100% natural ingredient. This key Ingredient acts like a sponge, drawing moisture in while also stimulating the production of collagen, resulting in skin that glows.