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GHRP-2 Acetate Half Life: Secretagogue Comparison
Understanding where GHRP-2 sits relative to other growth hormone secretagogues clarifies why half-life matters for protocol design. The table below compares GHRP-2 to closely related peptides and one non-peptide GHS. GHRP-2 Acetate 20–60 minutes 30–45 minutes
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- Understanding where GHRP-2 sits relative to other growth hormone secretagogues clarifies why half-life matters for protocol design. The table below compares GHRP-2 to closely related peptides and one non-peptide GHS.
- GHRP-2 Acetate
- 20–60 minutes
- 30–45 minutes
- 2–3× daily
- GHS-R1a agonist (ghrelin receptor), no GHRH activity
- Ideal for discrete pulsatile protocols; short half-life prevents receptor desensitization but demands consistent timing
- GHRP-6
- 15–60 minutes
- 30–40 minutes
- GHS-R1a agonist, stimulates appetite via ghrelin pathway
- Comparable kinetics to GHRP-2 but stronger appetite stimulation limits research settings where metabolic confounders must be controlled
- Ipamorelin
- 90–120 minutes
- 45–60 minutes
- 1–2× daily
- Selective GHS-R1a agonist, minimal ACTH/cortisol activation
- Longer half-life allows less frequent dosing; cleaner selectivity profile reduces off-target effects
- Hexarelin
- 60–90 minutes
- 30–50 minutes
- GHS-R1a agonist, strongest GH response but rapid desensitization
- Most potent acute GH pulse but develops tolerance within 14–21 days; short-term use only
- MK-677 (Ibutamoren)
- 4–6 hours
- Once daily
- Orally active GHS-R1a agonist, sustained receptor occupancy
- Long half-life simplifies dosing but causes continuous GH elevation and insulin resistance in some subjects; not pulsatile
- CJC-1295 (with DAC)
- 6–8 days
- N/A (priming, not pulsing)
- Once weekly
- GHRH analog, extends endogenous GHRH signaling
- Does not pulse GH directly; used to amplify GHRP-2 response by keeping GHRH receptors primed
- The GHRP-2 acetate half life positions it as the most controllable pulsatile secretagogue in this class. Shorter than ipamorelin, less prone to desensitization than hexarelin, and more selective than GHRP-6 (which cross-activates appetite pathways researchers often need to isolate). For teams running multi-week or multi-month studies, GHRP-2's rapid clearance is a feature. It allows daily pulse administration without the tachyphylaxis that ends hexarelin protocols within three weeks.
- Researchers working with discrete GH response windows. Acute IGF-1 measurement, post-exercise recovery models, circadian rhythm studies. Consistently choose GHRP-2 over longer-acting analogs specifically because the short half-life allows precise temporal control. The peptide does what you ask it to do for 90 minutes, then gets out of the way.