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Educational comparison - not medical advice. This page compares two compounds for informational purposes. Neither is recommended as treatment. Any protocol decision is a conversation with your licensed healthcare provider.
Home/Peptides/MK-677 vs Tesamorelin
HEAD-TO-HEAD COMPARISON

MK-677 vs Tesamorelin

Users choosing between oral convenience (MK-677) and cleaner side-effect profile (tesamorelin).

QUICK ANSWER

MK-677 is an oral ghrelin-receptor agonist (small molecule, not a peptide). Tesamorelin is an injectable GHRH analog (peptide). Key specs: MK-677 (Growth, ~24 hours, Oral (typically dropper solution or capsule)) vs Tesamorelin (Growth, ~26 minutes, Subcutaneous (abdominal)).

OPTION A
MK-677
MK-677 (Ibutamoren)
Oral, once-daily growth hormone secretagogue. Technically a small molecule, not a peptide - but lumped into the category for protocol purposes.
Full profile →
OPTION B
Tesamorelin
Tesamorelin (Egrifta)
FDA-approved GHRH analog with the strongest IGF-1 response of any peptide in its class.
Full profile →
THE CORE DIFFERENCE

MK-677 is an oral ghrelin-receptor agonist (small molecule, not a peptide). Tesamorelin is an injectable GHRH analog (peptide). Both elevate IGF-1 but through different receptors and different delivery. MK-677's ghrelin pathway drives notable appetite increase and water retention; tesamorelin's GHRH pathway is cleaner on those side effects. MK-677 users often see IGF-1 rise faster (within 4 weeks) but must monitor fasting insulin for insulin-resistance drift.

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FEATURE COMPARISON
MK-677
Tesamorelin
Full name
MK-677 (Ibutamoren)
Tesamorelin (Egrifta)
Category
Growth
Growth
FDA status
Not FDA-approved. Investigational; research chemical status.
FDA-approved as Egrifta for HIV-associated lipodystrophy. Widely used off-label.
Half-life
~24 hours
~26 minutes
Typical dosing
10–25 mg orally, once daily
1–2 mg nightly, subcutaneous, on an empty stomach
Route
Oral (typically dropper solution or capsule)
Subcutaneous (abdominal)
Classification
Small-molecule ghrelin receptor agonist
Synthetic GHRH (growth hormone releasing hormone) analog
BIOMARKERS COMMONLY TRACKED
On MK-677
  • • IGF-1
  • • Fasting glucose
  • • Fasting insulin
  • • HbA1c
  • • Prolactin
  • • Cortisol
On Tesamorelin
  • • IGF-1 (primary)
  • • IGFBP-3
  • • Fasting glucose
  • • HbA1c
  • • Fasting insulin
CALCULATOR
MK-677 reconstitution →
CALCULATOR
Tesamorelin reconstitution →
CONDITIONS USERS RESEARCH THESE FOR
Informational only - neither compound is presented as a treatment for any condition. These are contexts in which users research these compounds and discuss them with their licensed provider.
RECOVERY
Poor Sleep Quality
Chronic insufficient or fragmented sleep - upstream of most metabolic, hormonal, and cognitive markers.
METABOLIC
Elevated Visceral Fat
The metabolically-active abdominal fat linked to cardiovascular + insulin-resistance risk. Hard to see; visible in labs.
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Sermorelin vs Tesamorelin
HGH vs Tesamorelin
HGH vs MK-677
FREQUENTLY ASKED QUESTIONS

What is the difference between MK-677 and Tesamorelin?

MK-677 is an oral ghrelin-receptor agonist (small molecule, not a peptide). Tesamorelin is an injectable GHRH analog (peptide). Both elevate IGF-1 but through different receptors and different delivery. MK-677's ghrelin pathway drives notable appetite increase and water retention; tesamorelin's GHRH pathway is cleaner on those side effects. MK-677 users often see IGF-1 rise faster (within 4 weeks) but must monitor fasting insulin for insulin-resistance drift.

Who typically researches MK-677 vs Tesamorelin?

Users choosing between oral convenience (MK-677) and cleaner side-effect profile (tesamorelin). MK-677 (Growth, ~24 hours, Oral (typically dropper solution or capsule)) and Tesamorelin (Growth, ~26 minutes, Subcutaneous (abdominal)) differ in mechanism and dosing cadence - the right choice depends on protocol goals, biomarker baseline, and provider guidance. MyProtocolStack lets you log doses and lab values for both side-by-side if you're cycling between them.

What blood markers do users track on MK-677 or Tesamorelin?

Biomarkers commonly tracked across MK-677 and Tesamorelin protocols include IGF-1, Fasting glucose, Fasting insulin, HbA1c, Prolactin, Cortisol, IGF-1 (primary), IGFBP-3. Establishing a baseline before starting and re-drawing at consistent intervals lets you measure each compound's effect against your own reference point - generic lab ranges are less informative than your personal trend over time. MyProtocolStack tracks these biomarkers in the context of whichever compound you're currently running.

Whichever you're tracking, we built the dashboard for it.

Log doses, upload labs, watch the biomarkers trend. StackAI reads your panel in context of what you're actually running.

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Informational comparison only - not medical advice. Research-stage compounds discussed are not FDA-approved unless specifically noted. Any protocol decision should be made with a licensed healthcare provider.