Can I use ProLon® with an existing health condition? 22 February 2022 07:42 If you have a medical condition, then you must reach out to a healthcare provider to determine your suitability for ProLon®. Related articles Can I do ProLon® while breastfeeding? Will I lose muscle mass while I am on this program? Why should I avoid extreme temperature environments while on ProLon®? Do you experience ketosis while on ProLon®? What destinations do you deliver to?