Peptide data sheet
IGF-1 LR3
Performance · Long R3 IGF-1 · IGF-1 Long R3 · LR3 IGF-1
Verdict
unprovenfor muscle and recovery uses in humans, where controlled trials are essentially absent
Quick answer
IGF-1 LR3 (Long R3 IGF-1) is a synthetic, longer-lasting analog of insulin-like growth factor 1. It is commonly researched for muscle-cell growth and tissue signaling, and people in fitness communities report interest in recovery and lean mass. Controlled human evidence is essentially absent, side effects are not well characterized, it is banned in sport, and it is not FDA-approved for human use.
- Class
- Synthetic long-acting IGF-1 analog (IGF-1 receptor agonist)
- Half-life
- Extended vs native IGF-1; commonly reported around 20-30 hours in lab characterizations
- FDA status
- Not FDA-approved; sold for research/laboratory use only
- WADA banned?
- Yes
Which form actually works?
Injectable (subcutaneous, research)
Unproven
Nearly everything you read about IGF-1 LR3 assumes an injectable research form. There is no controlled human trial evidence behind the muscle and recovery uses people talk about, so treat this as unproven rather than promising.
Oral / topical
Unproven
IGF-1 LR3 is a peptide, so oral routes face the usual digestion problem, and topical claims have essentially no supporting data. Anything marketed this way should be read as unproven.