Source comparison
Peptides for Muscle Building: Comparison of Mechanisms
This table compares the primary peptide classes studied for anabolic and recovery applications. Their receptor targets, mechanisms, and documented effects differ significantly. GH Secretagogues (GHRP-2, Ipamorelin, Hexarelin) Stimulate pulsatile endogenous GH
This comparison does not assign a generated winner or score.
- This table compares the primary peptide classes studied for anabolic and recovery applications. Their receptor targets, mechanisms, and documented effects differ significantly.
- GH Secretagogues (GHRP-2, Ipamorelin, Hexarelin)
- Stimulate pulsatile endogenous GH release through ghrelin receptor activation
- GHS-R1a (ghrelin receptor) on pituitary cells
- 3–7× GH elevation, downstream IGF-1 rise, enhanced lipolysis, improved sleep quality
- Muscle protein synthesis studies, body composition research, aging intervention trials
- Most evidence-backed class for anabolic signaling. Synergistic with GHRH analogs
- GHRH Analogs (CJC-1295, Modified GRF 1-29)
- Amplify GH release through GHRH receptor stimulation; extended half-life with DAC modification
- GHRH receptor on anterior pituitary
- Sustained GH elevation over 6–8 days (with DAC), synergistic with GHS compounds
- Long-term growth hormone studies, metabolic research, cachexia models
- Best combined with GHS peptides. Mono-therapy less effective than combo protocols
- IGF-1 Variants (IGF-1 LR3, DES 1-3 IGF-1)
- Direct IGF-1 receptor activation, bypassing GH pathway entirely
- IGF-1 receptor on skeletal muscle and other tissues
- Localized muscle hypertrophy, increased satellite cell activation, reduced IGFBP binding
- Muscle wasting research, site-specific hypertrophy studies
- Potent but less studied than GH secretagogues. Higher risk of off-target effects
- Collagen Synthesis Peptides (BPC-157, TB-500)
- Promote angiogenesis, collagen production, and tissue repair; no direct anabolic signaling
- Multiple. Actin-binding proteins, VEGF pathways, fibroblast activation
- Accelerated tendon/ligament healing, reduced inflammation, improved joint integrity
- Injury recovery models, chronic tendinopathy research, post-surgical healing
- Adjunct to anabolic peptides. Support structural adaptation but don't drive hypertrophy alone
- Ghrelin Mimetics (MK-677)
- Oral GH secretagogue. Mimics ghrelin to stimulate GH release without injection
- GHS-R1a (same as GHRP class)
- 24-hour GH elevation, appetite stimulation, improved bone density markers
- Oral bioavailability studies, elderly sarcopenia research, appetite regulation
- Convenient oral option. Less peak GH than injectable GHS but more sustained baseline elevation