Side-by-Side Comparison · 2026

MK-677 vs Somatropin

MK-677 vs Somatropin — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

MK-677
Growth Hormone & IGF

MK-677 (ibutamoren) is an orally active, non-peptide ghrelin receptor agonist (GHS-R1a) that stimulates GH release from the pituitary without requiring injection. It was developed by Merck and advanced through Phase II trials for growth hormone deficiency, muscle wasting, and fra...

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Somatropin
Growth Hormone & IGF

Somatropin is recombinant human growth hormone (rhGH) - a 191 amino acid protein identical to endogenous pituitary GH, produced via recombinant DNA technology. It is FDA-approved for multiple indications including pediatric and adult growth hormone deficiency, Turner syndrome, HI...

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Key Parameters
Parameter MK-677 Somatropin
Category Growth Hormone & IGF Growth Hormone & IGF
Research Phase II (Discontinued) FDA Approved
Half-Life ~24 hours ~3–4 hours (SubQ); ~20 min (IV)
Typical Dose 10–25 mg 0.1–0.3 mg/day (GHD); up to 2 mg/day (clinical indications)
Frequency Once daily Daily or 6 days/week
Route Oral Subcutaneous / Intramuscular
FDA Status Not Approved Approved

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Frequently Asked Questions
What is the difference between MK-677 and Somatropin?
MK-677: MK-677 (ibutamoren) is an orally active, non-peptide ghrelin receptor agonist (GHS-R1a) that stimulates GH release from the pituitary without requiring injection. It was developed by Merck and advance... Somatropin: Somatropin is recombinant human growth hormone (rhGH) - a 191 amino acid protein identical to endogenous pituitary GH, produced via recombinant DNA technology. It is FDA-approved for multiple indicati...
Which has a longer half-life, MK-677 or Somatropin?
MK-677 half-life: ~24 hours. Somatropin half-life: ~3–4 hours (SubQ); ~20 min (IV).
Can you stack MK-677 and Somatropin?
MK-677 and Somatropin are in the same category and used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.