This Immune Support supplement now comprises suitable levels of Food State Vitamin C, Food State Selenium and Wholefood Zinc, each of which contributes to the normal function of the immune system. Each capsule contains 250mg of Beta 1-3, 1-6 Glucan, typically purified to a level of 70% - this is the optimal dosage and purification for this nutrient (higher levels of purification are not advisable). 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 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) Selenium and Zinc contribute to the normal function of the immune system