Understand the source comparison
Peptides and Calisthenics Synergy Timing Protocol: Injection Type Comparison
MK 677 (ibutamoren) 60–90 minutes pre-workout Sustained elevation over 4–6 hours Long half-life allows flexibility; aligns rising GH with mechanical load without requiring precise timing Best for athletes who train at inconsistent times or prefer once-daily do
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- MK 677 (ibutamoren)
- 60–90 minutes pre-workout
- Sustained elevation over 4–6 hours
- Long half-life allows flexibility; aligns rising GH with mechanical load without requiring precise timing
- Best for athletes who train at inconsistent times or prefer once-daily dosing
- GHRP-2
- 30–45 minutes pre-workout
- Sharp peak at 30–45 minutes post-injection
- Pulsatile GH spike during high-lactate sets maximises synergy with endogenous release
- Ideal for advanced users prioritising maximum GH elevation during training
- GHRP-6
- Similar kinetics to GHRP-2 but with appetite stimulation. Useful for athletes struggling to meet caloric surplus
- Best when combining peptide protocols with aggressive recomposition goals
- CJC-1295 (with DAC)
- Independent of training time
- Sustained elevation over 6–8 days
- Raises baseline GH without requiring injection-to-workout synchronisation
- Suitable for athletes using peptides as background anabolic support rather than acute training enhancement
- Hexarelin
- Strongest acute GH pulse of any secretagogue but develops tolerance faster
- Reserve for short-term peaking phases (4–6 weeks max) rather than year-round protocols