Source comparison
MK-677 vs Ibutamoren: Comparison Across Research Applications
Chemical Structure C27H36N4O5S Identical molecule. No structural difference CAS Number 159752-10-0 Same registry identifier. Interchangeable sourcing Receptor Target GHSR-1a agonist Same mechanism. Data from MK-677 studies applies to ibutamoren protocols Stand
This comparison does not assign a generated winner or score.
- Chemical Structure
- C27H36N4O5S
- Identical molecule. No structural difference
- CAS Number
- 159752-10-0
- Same registry identifier. Interchangeable sourcing
- Receptor Target
- GHSR-1a agonist
- Same mechanism. Data from MK-677 studies applies to ibutamoren protocols
- Standard Research Dose
- 10–25mg daily oral
- Dosing protocols published under either name are directly comparable
- Half-Life
- 4–6 hours
- Identical pharmacokinetics. Once-daily dosing sufficient regardless of name used
- Literature Indexing
- Primarily pre-2000 trials
- Post-2000 publications and INN filings
- Search both terms in PubMed to capture full evidence base
- The only naming context where the distinction matters is regulatory and procurement paperwork. When ordering from synthesis labs, specifying 'ibutamoren mesylate' ensures you receive the mesylate salt (standard research form), whereas 'MK-677' alone may require clarification. Certificates of analysis should list both names and confirm the mesylate salt form. If a supplier uses 'MK-677' but the CoA lists a different CAS number, that's a red flag. The compound may be mislabeled or adulterated.