Can I do ProLon® 5-day if during menstrual cycle? 29 June 2022 15:02 It is recommended not to take ProLon® 5-day during the days of the menstrual cycle. Related articles Can I do two consecutive ProLon® 5-day cycles? Can I do ProLon® 5-day if I have COVID-19 (even in the case of asymptomatic subjects)? Do ProLon® 5-day Menus 1 and 2 contain nickel? Do I lose weight? Can I consume the foods contained in the ProLon® 5-day kit every other day?