Should peptides be cycled?

Studies in people do not establish on and off schedules for peptides as a group. For most of this catalogue, no study has tested a cycle length against steady use. So any specific schedule is a habit, not a finding. The schedules passed around online are unverified. This site does not invent a schedule. The one measured exception is the growth hormone releaser family. In healthy men, a steady GHRH signal partly dulled the pituitary's response within hours. In a small study in people, daily GHRP-2 lowered peak growth hormone over five days. Even those studies did not test a four-weeks-on, two-weeks-off calendar. Full breakdown at /cycling.

Full cycling page: what was tested versus assumed

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of cycling and clearance. Whether peptides need a break, what a half-life actually tells you, and where a real cycling mechanism has been measured. Full detail at /cycling.