Is ProLon® gluten-free? 20 February 2023 17:08 Updated ProLon is gluen-free. Related articles How many cycles of ProLon® can be recommended to an individual in a one-year period? Can I participate in this program if I have a precedent of allergies, or maybe gluten or lactose intolerance? What if I have an allergy to nuts? Can I extend the fast? Do you experience ketosis while on ProLon®?