Tesamorelin vs MK-677
Comprehensive side-by-side comparison of mechanisms, dosing, side effects, and research
Also: Egrifta, TH9507
An FDA-approved GHRH analog used to reduce excess abdominal fat in HIV-infected patients with lipodystrophy. One of the few peptides with FDA approval.
Also: Ibutamoren, Nutrobal
An orally active growth hormone secretagogue that mimics ghrelin. Although technically not a peptide, it is frequently discussed alongside GH peptides due to similar effects.
Key Comparison Insights
- Tesamorelin is FDA approved, while MK-677 remains in research stages.
- Both peptides belong to the Growth Hormone category, suggesting similar primary applications.
- Tesamorelin has stronger research evidence (FDA Approved) compared to MK-677 (Human Trials).
Detailed Comparison
| Attribute | Tesamorelin | MK-677 |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| FDA Status | FDA Approved | Not FDA Approved |
| Clinical Status | Pre I II III IV FDA | Pre I II III IV FDA |
| Mechanism of Action | Tesamorelin is a stabilized analog of human GHRH that stimulates the pituitary to release growth hormone. It specifically reduces visceral adipose tissue (VAT) while having minimal effect on subcutaneous fat, likely through GH-mediated lipolysis. | MK-677 binds to ghrelin receptors (GHSR) in the brain, stimulating sustained GH release and increasing IGF-1 levels. Unlike injectable GHRPs, it is orally bioavailable and has a long half-life providing 24-hour GH elevation. |
| Common Dosing | 2 mg daily Once daily | 10-25 mg daily Once daily, often before bed |
| Administration | Subcutaneous injection | Oral |
| Typical Duration | Indefinite for approved indication | 8-12 weeks or longer |
| Best Time to Take | Before bed (fasted) | Before bed |
Possible Side Effects May vary by individual |
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| Research Summary | FDA approved based on trials showing significant reduction in trunk fat (up to 18%) in HIV lipodystrophy patients. Studies also show improvements in lipid profiles, particularly triglycerides. Research ongoing for cognitive benefits and NAFLD treatment. | Studies show increases in GH and IGF-1 levels, improved sleep quality, and increased lean body mass. However, a clinical trial was stopped early due to heart failure concerns in elderly patients. FDA lists MK-677 as having significant safety risks. Never received FDA approval. |
Frequently Asked Questions: Tesamorelin vs MK-677
What is the difference between Tesamorelin and MK-677?
Tesamorelin is a growth hormone peptide that an fda-approved ghrh analog used to reduce excess abdominal fat in hiv-infected patients with lipodystrophy. one of the few peptides with fda approval. MK-677 is a growth hormone peptide that an orally active growth hormone secretagogue that mimics ghrelin. although technically not a peptide, it is frequently discussed alongside gh peptides due to similar effects. The main differences lie in their mechanisms of action and clinical applications.
Which is better, Tesamorelin or MK-677?
Neither is universally "better" - the choice depends on your specific goals. Tesamorelin is typically used for growth hormone purposes, while MK-677 is used for growth hormone. Always consult with a healthcare provider to determine which may be appropriate for your situation.
Can Tesamorelin and MK-677 be used together?
Some peptide protocols combine multiple compounds for synergistic effects. However, using Tesamorelin and MK-677 together should only be considered under medical supervision, as both compounds have their own side effect profiles and potential interactions. Research on their combined use may be limited.
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Educational Information Only
This comparison of Tesamorelin and MK-677 is for educational purposes only. Neither this comparison nor any information on this site constitutes medical advice. Always consult with qualified healthcare providers before making decisions about peptides or other substances.