β-glucan is a polysaccharide comprised of β-linked d glucose molecules known for its immunostimulant activity. Various β-glucans have been extracted from various sources such as fungi, baker`s yeast, barley, oats, and seaweed. It is reported that when applied topically, β-glucans can be quickly absorbed into the skin and are accepted by the immune system, starting a process that attacks invading bacteria and viruses. β-glucans also help the skin to recover from overexposure to sun, mild burns, rashes, and even cuts and wounds by stimulating the skin tissue to rebuild surface cells and to restore the collagen structure.