Can I do ProLon® 5-day if during menstrual cycle? 21 February 2023 08:03 Updated It is recommended not to follow the ProLon® 5-day journey during the menstrual cycle period. Related articles Can I do two consecutive ProLon® 5-day cycles? Can I chew a gum during ProLon® 5-day? Can I do ProLon® 5-day if I have COVID-19 (even in the case of asymptomatic subjects)? Do I lose weight? Do ProLon® 5-day Menus 1 and 2 contain nickel?