Natures Own Beta Glucan supplement is a pure extraction and does not contain enough yeast protein to cause any allergic reactions Beta 1-3, 1-6 Glucan is a natural form of soluble dietary fibre, derived from the cell wall of baker's yeast Beta 1-3, 1-6 Glucan provides a role in activating the immune system, alerting the body to help defend itself against viral and bacterial invaders Due to its ability to assist in immune response Beta 1-3, 1-6 Glucan is most commonly associated with colds, flu and infections support All Beta Glucans are not the same and Beta 1-3, 1-6 Glucan should not be confused with the Beta Glucan found in oats (for example) that seeks to reduce cholesterol