What is MK-677 and how does it work?

MK-677 is a spiroindoline growth-hormone secretagogue that acts on the GHSR-1a receptor to stimulate GH and IGF-1 release, functioning as a ghrelin mimetic.

What is the regulatory status of MK-677?

MK-677 is research-only, not FDA-approved, reached Phase II trials but development was stopped, and is WADA prohibited in competition.

How do you calculate concentration when reconstituting lyophilized research powders?

Concentration equals milligrams of powder divided by milliliters of bacteriostatic water added; for example, 10 mg in 1 mL yields 10 mg/mL.

PreppinPeppers › Facts › Lab article

MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes

Machine-readable facts for this Lab article. The full page is https://www.preppinpeppers.com/blogs/the-lab/mk-677.

TL;DR

MK-677 (Ibutamoren) is a small, man-made molecule that can be taken by mouth. It belongs to a group called growth-hormone secretagogues (compounds that prompt

Facts Index

Fact ID	Category	Entity	Attribute	Value	Source
mk-677:title	identity	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	title	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:published	identity	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	published	2026-07-10	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:author	identity	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	author	Preppin' Peppers Editorial Team	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:topics	identity	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	topics	research, Research-only	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:summary	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	summary	MK-677 (Ibutamoren) is a small, man-made molecule that can be taken by mouth. It belongs to a group called growth-hormone secretagogues (compounds that prompt	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-1	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	What it is	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-2	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	MK-677 (Ibutamoren)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-3	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	What it is	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-4	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	Research context and categorization	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-5	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	Status	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-6	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	Reconstitution notes (general)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-7	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	Dilution and handling notes (compound-specific)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-8	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	Handling and storage	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-9	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	Related reading	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-10	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	Tools and supplies	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:section-12	content	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	section	What the research community gets wrong about MK-677 (Ibutamoren)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:product-gansulin-metal-peptide-pen	products	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	references product	Gansulin Pen · Reusable Click-Dial, 3 ml (1-60 Units)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:product-gansulin-3ml-cartridge	products	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	references product	Gansulin-Compatible 3 ml Glass Cartridge for Pens (10-Pack)	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:source-pubchem-ncbi-nlm-nih-gov	source	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	cites	NCBI PubChem CID 178024: Ibutamoren (C27H36N4O5S) - pubchem.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:source-pubmed-ncbi-nlm-nih-gov	source	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	cites	Nass et al., Ann Intern Med 2008: Effects of an oral ghrelin mimetic on body composition and clinical outcomes in healthy older adults: a randomized trial - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:source-pubmed-ncbi-nlm-nih-gov-2	source	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	cites	Copinschi et al., Neuroendocrinology 1997: Prolonged oral treatment with MK-677, a novel growth hormone secretagogue, improves sleep quality in man - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:source-pubmed-ncbi-nlm-nih-gov-3	source	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	cites	Ghigo et al., Eur J Endocrinol 1997: Growth hormone-releasing peptides - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:source-pubmed-ncbi-nlm-nih-gov-4	source	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	cites	Murphy et al., J Clin Endocrinol Metab 1998: MK-677, an orally active growth hormone secretagogue, reverses diet-induced catabolism - pubmed.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)
mk-677:source-pmc-ncbi-nlm-nih-gov	source	MK-677 (Ibutamoren): Reference Overview and Reconstitution Notes	cites	Sigalos and Pastuszak, Sex Med Rev 2018: The Safety and Efficacy of Growth Hormone Secretagogues - pmc.ncbi.nlm.nih.gov	Lab article (https://www.preppinpeppers.com/blogs/the-lab/mk-677) (evidence)

FAQ

What is MK-677 and how does it work?: MK-677 is a spiroindoline growth-hormone secretagogue that acts on the GHSR-1a receptor to stimulate GH and IGF-1 release, functioning as a ghrelin mimetic.
What is the regulatory status of MK-677?: MK-677 is research-only, not FDA-approved, reached Phase II trials but development was stopped, and is WADA prohibited in competition.
How do you calculate concentration when reconstituting lyophilized research powders?: Concentration equals milligrams of powder divided by milliliters of bacteriostatic water added; for example, 10 mg in 1 mL yields 10 mg/mL.