IGF-1 LR3 vs MK-677
Which should you choose? Here's what you need to know.
The short answer
IGF-1 LR3 and MK-677 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. 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.
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.
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.
IGF-1 LR3
MK-677
$12.00
Starting from
$59.99
$183.77
Avg. price per mg
$8.13
37
Vendors selling it
7
33 options
In stock now
6 options
9.1/10
Top trust score
7.0/10
Ready to buy?
Our top-rated vendor for each, based on trust scores, purity testing, and price.
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.