Quick comparison
| Peptide | Class | Evidence | Status |
|---|---|---|---|
| Ipamorelin | GH secretagogue | Limited | Not approved |
| Tesamorelin | GHRH analog | Moderate | Rx only |
The ranking
1
Ipamorelin
★ Best overall GH secretagogue Limited evidence
Ipamorelin is a selective growth-hormone-releasing peptide. In studies it raises GH with fewer off-target effects than older secretagogues.
Strengths
- Selective GH release in studies
- Fewer reported off-target effects
- Most-studied modern secretagogue
Limitations
- Little direct human muscle data
- Not approved for human use
- Banned by WADA
- Best for
- GH support
- Evidence
- Limited
- Status
- Not approved
2
Tesamorelin
★ Best human data GHRH analog Moderate evidence
Tesamorelin is the only compound here that is FDA-approved — for a specific condition — giving it the strongest human safety record of the group.
Strengths
- FDA-approved (specific indication)
- Robust human clinical data
Limitations
- Approved use isn't muscle growth
- Prescription only; costly
- Best for
- Evidence-led choice
- Evidence
- Moderate
- Status
- Rx only
How we picked
We rank by the strength of the published research first, then by safety profile and practical considerations. We take no payment for placement.
Important safety note
Read before considering any of these
With the exception of Tesamorelin (approved for a specific condition), none of these is approved for muscle growth, and all are banned in tested sport. Talk to a qualified healthcare professional first.
Frequently asked questions
Do muscle-building peptides actually work?
Some raise GH or IGF-1 in studies, but direct evidence they build meaningful muscle in healthy humans is limited.