What is Macimorelin?

The short answer

Macimorelin is a compound built to act like a peptide. In the US, you need a prescription to get Macimorelin.

2 sources
Status as of October 4, 2026
How we source
Ellum doesn't sell peptides.

By Ellum EditorialUpdated October 7, 2026AI use

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Peptides: Macimorelin (1 selected) · edit

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What it is

Type: Ghrelin receptor agonist (oral peptidomimetic)
Also known as: macrilen
How it works: Stimulates GH release to test for GH deficiency.

Regulatory status

FDA-approved (Rx) How we label status

As of October 4, 2026, Macimorelin is an FDA-approved prescription drug for diagnosis of adult growth hormone deficiency.

See Macimorelin in the Index →

Federal (FDA): Approved Rx (Macrilen NDA205598, 2017); Drugs@FDA lists Disc
503A compounding: Approved-drug component (not in any 503A category) (as of May 14, 2026)
WADA 2026: S2.2.4

References

Sources as of October 4, 2026