MGF vs MK-677
Which should you choose? Here's what you need to know.
The short answer
MGF and MK-677 are both growth hormone peptides, but they work differently. Mechano Growth Factor, a splice variant of IGF-1 produced in response to muscle damage. Studied for muscle repair and growth. Also called Ibutamoren. Taken orally rather than injected, it tells the body to release more growth hormone. Technically a secretagogue, not a peptide, but sold alongside them everywhere. Compare vendor pricing and availability below.
On 19 Sep 2026 Peptide Compare tracked 22 vendors selling MGF, cheapest in stock $11.80 per mg at Biotech Peptides, and 8 selling MK-677, cheapest $2.00 per mg at Soma Chems.
MGF
Growth HormoneMechano Growth Factor, a splice variant of IGF-1 produced in response to muscle damage. Studied for muscle repair and growth.
MK-677
Growth HormoneAlso called Ibutamoren. Taken orally rather than injected, it tells the body to release more growth hormone. Technically a secretagogue, not a peptide, but sold alongside them everywhere.
Price & availability
Once you've decided which peptide fits your needs, here's how they compare on price and vendor options. Prices verified Sep 19, 2026.
MGF
MK-677
$28.99
Starting from
$59.99
$18.48
Avg. price per mg
$7.63
22
Vendors selling it
8
19 options
In stock now
9 options
9.1/10
Top trust score
7.0/10
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Where does this data come from?
We re-check vendor prices continuously and score vendors on Finnrick blind-test results — samples bought anonymously and sent to a lab, not vendor claims. No vendor can pay to rank higher. See our full methodology.