Milk is not used in the manufacturing of Bio-Kult S. Boulardii. However, milk is used in the manufacture of fermentation media and cryoprotectants of other products in the Bio-Kult range. Allergen testing for Bio-Kult S. Boulardii has shown some carry over of low levels of casein (milk protein) in the final product. Bio-Kult S. Boulardii therefore carries the statement ‘may contain milk’ and is not recommended for those with an allergy to milk proteins. Bio-Kult S. Boulardii is a soya-free product.