New to peptides? Start with the foundations ->
The dad-test answer
These two peptides do different jobs and most operators run them together. CJC-1295 increases the height of growth hormone pulses; ipamorelin increases the frequency. Solo, ipamorelin is the cleaner molecule with fewer side effects. The standard biohacker stack is CJC-1295 (no DAC) plus ipamorelin in a single subQ shot.
Who wins for what
| Use case | Who wins, and why |
|---|---|
| GH pulse amplitude |
cjc-1295 CJC-1295 is a GHRH analog - it directly stimulates somatotrophs to release more GH per pulse. |
| GH pulse frequency, cleaner side-effect profile |
ipamorelin Ipamorelin is a selective ghrelin-receptor agonist - it triggers pulses without raising cortisol or prolactin like older secretagogues. |
| single-molecule simplicity |
ipamorelin Solo ipamorelin is the lowest-side-effect GH-axis peptide; cleaner choice when stacking isn't an option. |
| stack synergy |
tie - run both GHRH plus a ghrelin agonist hits two different receptors and produces larger GH pulses than either alone. |
What the head-to-head data shows
Both are research-use-only peptides without FDA approval for GH-axis use, though ipamorelin reached Phase 2 trials for postoperative ileus before development stalled. Teichman et al. 2006 covers CJC-1295's GHRH-analog mechanism in healthy adults. Raun et al. 1998 and follow-up work characterized ipamorelin's selective ghrelin-receptor activity (no cortisol or prolactin elevation, unlike GHRP-6 or hexarelin). The two peptides hit different receptors - GHRH receptor for CJC-1295, ghrelin receptor for ipamorelin - so the stack produces a larger and more physiologic GH pulse than either alone. This is the most-used non-BPC-157 biohacker peptide stack, run as a subcutaneous injection 5 nights a week before bed.
Our honest call
Run them together - that's why they exist as a pair. Solo CJC-1295 produces bigger GH spikes but you eventually want frequency too. Solo ipamorelin is cleaner but the pulse height is smaller. The CJC-1295 + ipamorelin protocol covers the standard 8-to-12-week cycle, the dosing math, the IGF-1 monitoring, and the actual thing this stack does (and doesn't do) for body composition. Honest framing: the GH-axis peptide stack is not a body recomp shortcut. Sleep quality and recovery are the most consistent outcomes; fat loss and lean mass changes are smaller and slower than the marketing suggests.
Sources and citations
- Teichman et al., CJC-1295 in healthy adults, J Clin Endocrinol Metab 2006 (PMID 16352683)
- Raun et al., Ipamorelin GH-releasing peptide, Eur J Endocrinol 1998 (PMID 9849822)
- Sigalos and Pastuszak, GH secretagogue review, Sex Med Rev 2018
- US compounding pharmacy formularies
Where to go next
Subscribe to the dispatch
The weekly Protocol One dispatch covers what's moving in peptides, GLP-1s, and longevity protocols. Free. 5-min read. Broken down for normal humans.
Last reviewed · 2026-05-07 · Page generated by Protocol One matrix engine. None of this replaces a doctor. Peptides are gray-market in the US for most uses. Talk to a real prescriber before you change anything.