Does the ProLon® 5-day kit contain gluten or lactose? 29 June 2022 14:59 The box is not entirely gluten-free. People who are lactose intolerant, however, can safely consume ProLon® 5-day. Related articles Can I drive during ProLon® 5-day? Can I go swimming? I want to start ProLon® 5-day, what kind of blood tests should I do? Is the ProLon® 5-day kit vegan? I don't like the taste of L-Drink, how can I improve it?