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How to Increase Endurance with Peptides: Comparison
Growth Hormone Secretagogues (MK 677, CJC1295) Stimulates pulsatile GH release → IGF-1 elevation → mitochondrial biogenesis and enhanced recovery 4–8 weeks for measurable VO2max improvement; 8–12 weeks for mitochondrial density increases MK 677: once daily; CJ
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- Growth Hormone Secretagogues (MK 677, CJC1295)
- Stimulates pulsatile GH release → IGF-1 elevation → mitochondrial biogenesis and enhanced recovery
- 4–8 weeks for measurable VO2max improvement; 8–12 weeks for mitochondrial density increases
- MK 677: once daily; CJC1295: twice weekly
- Serum IGF-1 (target 60–100% above baseline)
- Best for improving recovery between training blocks and increasing mitochondrial enzyme capacity. Limited direct impact on oxygen transport
- EPO-Mimetic Peptides
- Stimulates erythropoietin production → increased red blood cell mass → elevated oxygen-carrying capacity
- 6–8 weeks for hematocrit elevation; 10–12 weeks for performance gains
- Twice weekly during build phase
- Hematocrit and hemoglobin levels (target <52% in males, <50% in females)
- Most effective for endurance events limited by oxygen delivery. Requires careful monitoring to avoid excessive blood viscosity
- PPAR-Delta Agonists (SLU PP 332)
- Activates nuclear receptors that shift muscle fiber toward oxidative phenotype and increase fat oxidation
- 3–6 weeks for metabolic substrate shift; 8–10 weeks for fiber-type adaptation
- Once daily
- Respiratory exchange ratio (RER) during submaximal exercise
- Ideal for ultra-endurance efforts where glycogen depletion is the limiting factor. Minimal benefit for efforts under 90 minutes
- Combined Protocols (GH + EPO + PPAR)
- Multi-pathway intervention targeting oxygen transport, mitochondrial function, and substrate utilisation simultaneously
- 8–12 weeks for full adaptation across all systems
- Varies by compound
- IGF-1, hematocrit, and RER simultaneously
- Highest performance ceiling but requires precise biomarker tracking and dose titration. Most complex to execute correctly