Cycle Support - supplements are meant to be taken when "in cycle" with SARMs, prohormones. A cycle is basically a period of time during which nutritional supplements are taken. This varies but can be 4-8 weeks, followed by an "off" period where post cycle therapy (PCT) is introduced. This varies but can be 4-8 weeks, followed by an "off" period where post cycle therapy (PCT) is introduced.