The Bio-Kult range does not contain: fish, crustaceans, nuts, peanuts, sesame, celery, mustard, cereals containing gluten, wheat, egg, molluscs, lupin, sulphur dioxide or sulphites. We have tested the Bio-Kult products with an external laboratory and have certification to confirm that gluten was not found upon testing. The testing analyses for presence < 5mg/kg, which under the gluten regulations means we can say it is gluten free. Each of our specific live bacteria strains need various nutrition sources to aid in their growth in culture. Cow's milk and soya are used in the fermentation process for all of the Bio-Kult products except Bio-Kult S. Boulardii. This is why you will see them listed in bold in the ingredients list on the boxes. On testing the final products, low levels of milk proteins (casein and beta-lactoglobulin) have been detected. Whilst there will be variations between batches, as an example, on the last testing of Bio-Kult Everyday , the amount of casein per capsule is roughly equivalent to that found in less than 1/100th of a 5ml teaspoon and the amount of beta-lactoglobulin even less. Therefore, we do not recommend Bio-Kult for those with a milk allergy (to milk proteins), but for others it is unlikely to cause issues. Very small amounts of lactose are also sometimes detected in the final products. On last testing Bio-Kult Everyday Gut the amount of lactose was roughly equivalent to that found in 1/100th of a teaspoon of milk. This is far below the amount likely to affect lactose intolerance sufferers. Scientific studies and the European Food Standards Agency (EFSA) have found that the majority of subjects with lactose maldigestion will tolerate up to 12g of lactose as a single dose with no or minor symptoms. Tests have also shown that many of the Bio-Kult strains produce lactase, the enzyme deficient in lactose intolerant sufferers necessary to break down lactose. Our products are therefore suitable for those with a lactose intolerance. The amount of soya left in the final product was below the lab’s lower limit of detection. However, it should be noted that we have not tested the Bio-Kult products in those with a known soy allergy.