In human studies, hexarelin raised not only growth hormone but also cortisol and prolactin, effects that were transient and dose-related. Facial flushing and injection-site reactions are the effects most commonly described with GHRPs of this type.[1][2]
Reviewed for accuracy · Last reviewed July 8, 2026As a growth hormone secretagogue, hexarelin shares class-level effects discussed for this group, including water retention and changes in insulin sensitivity. Because hexarelin was never developed into an approved product, its longer-term safety in humans is not well characterized and there is no label documenting rarer risks.
A separate caveat is desensitization: the GH-releasing effect tends to attenuate with continued use. This is a pharmacological attenuation of effect rather than a classic adverse event, but it shapes how the peptide behaves over time.
Flushing and hormone rises reported in studies were generally transient. Because hexarelin is not an approved medicine, any use is unproven and should be discussed with a doctor.
This page is an independent educational reference and is not medical advice, and does not indicate any approval status for any use. Talk to a doctor before starting any compound.