BPC-157 vs MK-677
An evidence-first, side-by-side comparison. We compare what the research supports — not marketing claims.
Last updated
Evidence grade
Animal
Human RCT
What that means
Preclinical evidence from animal models only — not yet shown in humans.
Randomized controlled trials in humans — the strongest evidence we grade.
Status
Research compound
Research compound
Mechanism
A stable 15–amino-acid sequence pulled from a protein found in human gastric juice. In rodents it seems to speed healing by recruiting new blood vessels and driving soft-tissue repair, and by keeping tendon and gut cells alive and migrating where they are needed. Exactly how it pulls this off is still being worked out — and none of it has been confirmed in humans.
MK-677 is a non-peptide ghrelin mimetic. It binds the growth hormone secretagogue receptor (GHSR-1a) — the same one the hunger hormone ghrelin hits — and sets off pulsatile GH release from the anterior pituitary, which then raises IGF-1. Where the GHRH analogs (sermorelin, tesamorelin, CJC-1295) act upstream, MK-677 works directly on the GHSR. Two practical consequences follow: it is orally active, so no injections, and it ramps up appetite through that same ghrelin pathway — not what most people chasing body composition are hoping for.
Goals
Tendon & ligament repair, Gut healing, Muscle recovery
Body composition, GH / IGF-1 support
Key risks
- No published human RCTs — efficacy in people is unproven
- No long-term human safety data; effects of chronic dosing are unknown
- Sold "for research use only," so purity, dose accuracy, and contamination vary by source
- Increased fasting glucose and worsened insulin sensitivity — clinically meaningful risk for pre-diabetic or diabetic individuals (Nass 2008 RCT)
- Congestive heart failure safety signal: a phase IIb RCT in hip fracture patients was terminated early due to this finding (Adunsky et al., 2011, PMID 21067829)
- Appetite stimulation via ghrelin pathway; increased body weight reported in RCT (2.7 kg vs. 0.8 kg placebo)
Regulatory
Sold "for research use only" — not approved for human consumption.
Sold "for research use only" — not approved for human consumption.