IGF-1 LR3 vs MGF
Which should you choose? Here's what you need to know.
The short answer
IGF-1 LR3 and MGF are both growth hormone peptides, but they work differently. A modified version of IGF-1 with an extended half-life due to an arginine substitution. Studied for its potent growth-promoting and anabolic effects. Mechano Growth Factor, a splice variant of IGF-1 produced in response to muscle damage. Studied for muscle repair and growth. Compare vendor pricing and availability below.
On 19 Sep 2026 Peptide Compare tracked 45 vendors selling IGF-1 LR3, cheapest in stock $20.83 per mg at Bio Pepz, and 22 selling MGF, cheapest $11.80 per mg at Biotech Peptides.
IGF-1 LR3
Growth HormoneA modified version of IGF-1 with an extended half-life due to an arginine substitution. Studied for its potent growth-promoting and anabolic effects.
MGF
Growth HormoneMechano Growth Factor, a splice variant of IGF-1 produced in response to muscle damage. Studied for muscle repair and growth.
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.
IGF-1 LR3
MGF
$12.00
Starting from
$28.99
$161.44
Avg. price per mg
$18.48
45
Vendors selling it
22
38 options
In stock now
19 options
9.1/10
Top trust score
9.1/10
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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.