GHRP-2 vs GHRP-6: Mechanism, Specs & Reported Ranges Compared
Side-by-side comparison of GHRP-2 and GHRP-6 — receptor mechanism, half-life, vial sizes, reconstitution and reported study arms.
By PX1 Research Team · August 4, 2026
GHRP-2 vs GHRP-6 at a glance
| GHRP-2 | GHRP-6 | |
|---|---|---|
| Class | growth hormone releasing hexapeptide | growth hormone releasing hexapeptide |
| Reported half-life | not well characterized | not well characterized |
| Vial sizes | 10 mg | 10 mg |
| Typical reconstitution | 10 mg + 2 mL = 5 mg/mL | 10 mg + 2 mL = 5 mg/mL |
| Research focus | GHS-R secretagogue research | ghrelin-pathway and appetite-signalling research |
Mechanistic difference
Both are hexapeptide secretagogues. GHRP-6 is noted in the literature for stronger appetite-signalling effects; GHRP-2 for a cleaner GH-release profile.
Reported study ranges side by side
GHRP-2
| Study arm | Reported amount | Cadence |
|---|---|---|
| Standard arm | 100 mcg | 1–3× daily |
GHRP-6
| Study arm | Reported amount | Cadence |
|---|---|---|
| Standard arm | 100–150 mcg | 1–3× daily |
Practical handling differences
Both arrive lyophilized and shelf-stable. GHRP-2 is typically prepared at 10 mg + 2 mL = 5 mg/mL; GHRP-6 at 10 mg + 2 mL = 5 mg/mL. Where half-lives differ, the literature's dosing cadence differs accordingly — longer-acting molecules are described weekly, shorter-acting ones daily or split.
Which one appears in which research context
GHRP-2 shows up primarily in GHS-R secretagogue research. GHRP-6 is used in ghrelin-pathway and appetite-signalling research. They are not interchangeable substitutes; the receptor profile, not the marketing category, determines where each is used.
Documentation and sourcing
Both are supplied at ≥99% HPLC purity with lot-level COAs at /coa. Product pages: GHRP-2 · GHRP-6.
How PX1 documents every lot
Every PX1 lot ships with HPLC purity, LC-MS identity, residual solvent, moisture (Karl Fischer), sterility and endotoxin data. Lot documentation is published at /purity-reports, /endotoxin-reports and /coa. Synthesis, purification, lyophilization and vial fill happen in U.S. facilities — see /manufacturing-process.
Research use only. PX1 Research supplies compounds for laboratory and in-vitro research. Nothing here is medical advice, a dosing recommendation, or an offer for human or veterinary use. Figures cited are reported from published laboratory literature.