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Ghrelin receptor agonist (peptidomimetic)

Macimorelin

Macimorelin is an orally active ghrelin/growth hormone secretagogue receptor agonist. It was approved by the FDA in 2017 as a diagnostic agent that stimulates growth hormone release to help evaluate adult growth hormone deficiency. This page is educational and is not medical advice.

By The Peptides Codex Editorial TeamReviewed July 10, 2026
Length
n/a
Class
Ghrelin receptor agonist (peptidomimetic)
Function
Growth hormone secretagogue receptor agonist
Context
FDA-approved oral diagnostic agent for adult growth hormone deficiency (prescription)

First oral, ghrelin-mimetic diagnostic test for adult growth hormone deficiency.

Also known as: Macrilen · AEZS-130 · ghrelin receptor agonist

Part of the Growth hormone & IGF peptides cluster

Overview

Macimorelin is an orally active ghrelin/growth hormone secretagogue receptor agonist. It was approved by the FDA in 2017 as a diagnostic agent that stimulates growth hormone release to help evaluate adult growth hormone deficiency. This page is educational and is not medical advice.

Source & context

Biological / chemical source: Synthetic orally active peptidomimetic

Primary research or clinical context: FDA-approved oral diagnostic agent for adult growth hormone deficiency (prescription)

A diagnostic, not a treatment

Macimorelin is used to provoke a measurable growth hormone response. Because it is taken by mouth, it offers a simpler alternative to older stimulation tests such as the insulin tolerance test for assessing adult GH deficiency.

Ghrelin-mimetic action

By activating the growth hormone secretagogue receptor, macimorelin mimics ghrelin's ability to trigger pituitary GH release. This links it conceptually to research GH secretagogues such as ipamorelin and the GHRP family.

FAQ about Macimorelin

What is Macimorelin?+

Macimorelin is an orally active ghrelin/growth hormone secretagogue receptor agonist. It was approved by the FDA in 2017 as a diagnostic agent that stimulates growth hormone release to help evaluate adult growth hormone deficiency. This page is educational and is not medical advice.

Is Macimorelin an approved medicine?+

Macimorelin: FDA-approved oral diagnostic agent for adult growth hormone deficiency (prescription). Always follow licensed medical guidance for approved products.

What is the typical length of Macimorelin?+

Macimorelin is not a classic amino-acid chain peptide in the same sense; see the profile for classification details.

Related peptides

References & further reading

  1. 1.Wikipedia — Macimorelin
  2. 2.PubChem — compound summary for Macimorelin (CID 9804938)
Disclaimer: Educational content only. Not medical advice. Not instructions for human use. Research peptides and unapproved products may be restricted or illegal to market for human consumption in your jurisdiction. Consult qualified professionals and applicable law.
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Cite this: Peptides Codex — Macimorelin educational profile.
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