Bio-Kult S.Boulardii is an advanced multi-action formulation designed to target both the Immune System and Digestive Tract. Bio-Kult S.Boulardii contains vitamin D3 which contributes to the normal functioning of the immune system. Backed by clinical research, Bio-Kult is suitable for everyday use as part of a healthy lifestyle. Use alongside antibiotics and whilst travelling (no need to refrigerate). Vegetarian Society approved.