Is ProLon® gluten-free? 22 February 2022 07:43 ProLon may contain traces of gluten. Related articles Can I participate in this program if I have a precedent of allergies, or maybe gluten or lactose intolerance? Has my order been shipped? What if I have an allergy to nuts? How many cycles of ProLon® can be recommended to an individual in a one-year period? How does the 5-day program work?