Hexarelin is a synthetic growth hormone releasing peptide in the same family as GHRP-2 and GHRP-6. It produces the strongest acute GH pulse of the three, but it comes with two well-documented problems: meaningful cortisol and prolactin elevation, and rapid receptor desensitization. Those tradeoffs are why most current GH-focused protocols use ipamorelin or MK-677 instead.
If you are tracking hexarelin specifically, you need to be tracking the downsides as carefully as the upsides.
What it does
- Binds the ghrelin (GHS-R1a) receptor on the pituitary
- Triggers a strong GH pulse, typically larger than GHRP-2 or GHRP-6
- Also raises cortisol and prolactin, more than its cousins
- Has some cardiac-protective signaling shown in animal models (independent of GH)
Typical protocol shape
Commonly reported in self-experimenter circles:
- 100 mcg subcutaneous, 1-3x per day
- Short cycles (4-6 weeks) followed by equivalent time off
- Sometimes paired with a GHRH like CJC-1295 (no DAC) or sermorelin
The short-cycle pattern is the key feature: desensitization at the GHS-R1a receptor is fast and well-documented for hexarelin specifically.
What to track daily
- Dose, time, site
- Sleep quality and duration (deep sleep is often the first thing to notice and the first thing to fade)
- Appetite changes (hunger spike is typical)
- AM and afternoon energy (0-10)
- Joint pain, water retention, puffiness
- Mood, especially irritability or low affect (cortisol clue)
What to track weekly
- Bodyweight and waist
- Skin and hair changes
- Strength or recovery markers if you train
- Subjective "is it still working?" score
This is the score that matters most for hexarelin. If your week-4 score is much lower than week-1, desensitization is likely.
Bloodwork worth doing
- Baseline and mid-cycle: IGF-1, fasting glucose, HbA1c, prolactin, cortisol (AM)
- Lipid panel if running long
- Hexarelin can raise prolactin enough to matter; if libido drops, check it
Realistic expectations
- Acute GH pulse is real but transient
- IGF-1 rises modestly in self-reported cases
- Tolerance builds quickly; many users report effects fading within 3-4 weeks
- Cortisol and prolactin elevation can produce mood and libido problems
Common mistakes
- Long continuous cycles (this is the big one)
- Stacking with other ghrelin-receptor agonists
- Ignoring rising prolactin
- Comparing it directly to ipamorelin without accounting for the cortisol issue
A tracking template
- Daily: dose, sleep, energy, hunger, mood, water retention
- Weekly: weight, waist, strength, subjective effect score
- Mid-cycle: IGF-1, fasting glucose, prolactin, AM cortisol
- End of cycle: re-test the same panel and compare
Peptide IA's cycle view makes the desensitization curve obvious when you plot your weekly "is it still working" score against time.
Safety notes
Hexarelin's cortisol and prolactin effects are not theoretical; they show up in human studies. If you experience persistent mood changes, libido drop, or sleep disruption that gets worse over time, stop and reassess. The desensitization issue means open-ended use is self-defeating regardless of safety.
Peptide IA is an educational and self-tracking tool. Nothing in this post is medical advice. Doses mentioned reflect what is commonly reported in research literature — they are not recommendations. Always consult a qualified physician before starting, changing, or stopping any protocol.