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MK-677 (Ibutamoren) vs Tesamorelin
MK-677 (Ibutamoren) and Tesamorelin are both growth hormone peptides, which is why they get recommended interchangeably — but they are different compounds with different origins. A mixed vial also keeps differently: about 60 days for MK-677 (Ibutamoren) against 30 for Tesamorelin. The table below sets out the differences. We give no dosing guidance.
Side by side, in plain English — what each one is, where they overlap and where they genuinely differ.
MK-677 (Ibutamoren)Growth Hormone
TesamorelinGrowth HormoneAt a glance
| MK-677 (Ibutamoren) | Tesamorelin | |
|---|---|---|
| Category | Growth Hormone | Growth Hormone |
| Typical route | Oral | SubQ |
| Shelf life once mixed | ~60 days | ~30 days |
| Commonly reported effects | Sustained GH/IGF-1 elevation Appetite increase Deeper sleep | Visceral fat loss Improved lipids Cognitive benefits |
| Reported considerations | Water retention Lethargy Insulin resistance | Joint pain Hyperglycemia Injection site reaction |
The differences that actually matter
Both are classed as Growth Hormone peptides, so they get compared constantly and are often researched for overlapping reasons.
Route of administration differs — MK-677 (Ibutamoren) is typically oral, Tesamorelin is typically subq. That alone changes how convenient each one is to keep up with.
Once reconstituted, MK-677 (Ibutamoren) keeps noticeably longer than Tesamorelin (~60 days vs ~30 days), so vial waste is a real difference between the two.
Reported mainly for MK-677 (Ibutamoren): sustained gh/igf-1 elevation, appetite increase, deeper sleep.
Reported mainly for Tesamorelin: visceral fat loss, improved lipids, cognitive benefits.
What MK-677 (Ibutamoren) is
MK-677, also known as Ibutamoren, functions as a non-peptide ghrelin receptor agonist, specifically targeting the growth hormone secretagogue receptor type 1a (GHSR-1a). By mimicking the action of endogenous ghrelin, it stimulates the pituitary gland to increase the pulsatile secretion of growth hormone (GH). This mechanism leads to sustained elevations of both GH and insulin-like growth factor 1 (IGF-1) levels in the body, typically over a 24-hour period due to its approximate 24-hour half-life. It operates by enh
What Tesamorelin is
Tesamorelin is a synthetic peptide analog of Growth Hormone-Releasing Hormone (GHRH). It functions by binding specifically to and activating the GHRH receptors located on the somatotroph cells within the anterior pituitary gland. This activation stimulates the pituitary to produce and release endogenous growth hormone (GH) in a pulsatile fashion, closely mimicking the body's natural secretion patterns. The subsequent increase in systemic growth hormone levels leads to elevated Insulin-like Growth Factor 1 (IGF-1) p
How to compare them for yourself
Anecdotes online are noisy because nobody is measuring the same thing. The only comparison that means anything is your own: log each entry with a timestamp, keep the vial ledger honest so you know what you actually got through, pick two or three metrics before you start, and look at the trend after several weeks rather than day to day.
Peptide Wizard does that part for you — MK-677 (Ibutamoren) and Tesamorelin are both in the built-in reference library with a 3D vial, and your history, vial ledger and cost per entry stay private on your device.
FAQ
What is the difference between MK-677 (Ibutamoren) and Tesamorelin?
Both are classed as Growth Hormone peptides, so they get compared constantly and are often researched for overlapping reasons.
Can you log MK-677 (Ibutamoren) and Tesamorelin in the same period?
Plenty of people record more than one peptide at a time. Peptide Wizard keeps a separate vial ledger and entry history for each, so you can see exactly what overlapped and when — it does not recommend combinations or doses.
Which is better, MK-677 (Ibutamoren) or Tesamorelin?
There isn't a universal answer — reported responses vary a lot between individuals, which is why your own log is more informative than anyone else's anecdote. Track one variable at a time and compare your own metrics over several weeks.
Is this medical advice?
No. This page is educational reference material only. It contains no dosing guidance. Speak to a qualified healthcare professional before making any decisions.
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Educational reference only. This page contains no dosing guidance and is not medical advice.