ProtocolsMarch 25, 2026
Peptide cycling 101 for research protocols
Why research cycles are typically run in 8–12 week blocks — and how researchers structure washout windows, dose timing, and stacking across a multi-compound protocol.
Why research runs in cycles
Peptide research protocols are structured in discrete cycles for three reasons: receptor density downregulation over prolonged exposure, the statistical need for a clean washout to measure persistence of effect, and the regulatory framework that most published research operates within.
Common cycle lengths
- Recovery-focused research: 4–6 weeks
- Fat loss research: 12–16 weeks
- Longevity and senescence research: 8–12 weeks
Washout windows
Most published protocols include a washout window of at least half the active cycle length. This allows receptor resensitisation and creates a cleaner comparison between cycle-on and cycle-off biomarker measurements.