The word “selective” describes a comparison made under particular experimental conditions. It does not mean that a compound has only one effect in every person, or that increasing the selected hormone is harmless. Those are different claims requiring different evidence.
The original ipamorelin paper investigated cells and animal models. Its hormonal comparisons included conscious swine, where the measured ACTH and cortisol responses helped distinguish ipamorelin from other secretagogues. That is valuable pharmacology, but it is not a long-term human safety trial.
Separate three questions
First, what receptor pathway does the molecule engage? Second, which hormones change in the experiment? Third, does the overall intervention improve health without unacceptable harm? A favorable answer to the second question cannot settle the third.
“Releases your own GH” can sound reassuring because the hormone is endogenous. The relevant issue, however, is the magnitude, timing and consequences of the response, not merely where the hormone was produced. A physiological molecule can still be involved in an inappropriate physiological state. This reasoning does not establish that ipamorelin causes any particular complication; it explains why the source of GH is not a safety certificate.
Reddit comparisons often place ipamorelin, other secretagogues and GH into a simple mild-to-strong ranking. That ranking obscures differences in study population, measured outcomes and formulation. A short experiment examining selected hormones cannot rank years of use in otherwise healthy adults.
A meaningful human comparison would need prespecified endocrine outcomes, adequate observation, adverse-event collection and a matched population. It would also need to identify the exact product, not just a familiar name. Without those details, “selective” should remain a description of the cited experiment.
For a clinician reviewing a claim, the useful follow-up is therefore: selective for what, compared with what, measured in which species, and for how long? Those four questions turn a marketing adjective into something that can actually be checked.