Source comparison
Half-Life Comparison: Understanding the GHRH Spectrum
Half-life determines everything about a GHRH analog's dosing schedule, GH release pattern, and clinical utility. This table maps the full spectrum from the shortest-lived to the longest. Native GHRH (1-44) <7 minutes Impractical Ultra-brief pulse DPP-IV degrad
This comparison does not assign a generated winner or score.
- Half-life determines everything about a GHRH analog's dosing schedule, GH release pattern, and clinical utility. This table maps the full spectrum from the shortest-lived to the longest.
- Native GHRH (1-44)
- <7 minutes
- Impractical
- Ultra-brief pulse
- DPP-IV degrades it instantly
- Sermorelin (GRF 1-29)
- 10-20 minutes
- 1-2x
- Brief pulse
- FDA-approved 1997 (Geref), withdrawn 2008
- Mod GRF 1-29 (CJC-1295 no DAC)
- 2-3x
- Pulsatile
- 4 amino acid substitutions block DPP-IV
- Tesamorelin (44 AA + hexenoic acid)
- 26-38 minutes
- 1x
- Moderate pulse
- FDA-approved for HIV lipodystrophy
- CJC-1295 with DAC
- 1-2x/week
- Sustained, continuous
- Albumin-binding Drug Affinity Complex
- The 30-minute half-life of mod GRF 1-29 sits in a pharmacological sweet spot. It is long enough to produce a robust GH pulse (peak GH occurs 15-30 minutes post-injection and returns to baseline within 2 hours) but short enough that the peptide clears before the next natural GHRH pulse from your hypothalamus. This means the feedback loop stays intact. Somatostatin can reset between injections, keeping the pituitary sensitive to each subsequent dose.
- Borges et al. confirmed that repeated subcutaneous injections of GHRH analogs with short half-lives maintain GH responsiveness over extended protocols without evidence of tachyphylaxis, provided injections are spaced to allow somatostatin rebound (Borges et al., Neuroendocrinology, 1999). This absence of desensitization is the primary clinical advantage over both longer-acting GHRH analogs and potent GHRPs like hexarelin.
- For real-time half-life tracking across your entire peptide protocol, use the peptide half-life tracker.