IGF-1 LR3 research: studies, doses and safety

An unapproved growth signal with no human trials found.

Also called: Long R3 IGF-I, Long Arg3 IGF-1, LR3-IGF-1, Long-[Arg3]IGF-I.

IGF-1 and analogues · Modified IGF-1 receptor agonist · Evidence: Animal studies only.

No human LR3 study found on benefits, safety or how the body handles it. Animal and cell findings cannot establish human dosing.

Key studies

  • LR3 structure and binding: LR3 is a distinct molecule with altered binding-protein interactions. (source)
  • Organ growth in guinea pigs: Organ growth did not translate into greater overall growth. (source)
  • Growth-restricted fetal sheep: LR3 did not improve fetal growth in this model. (source)

Related to IGF-1 LR3

Sources

Sources checked: 2026-10-18.

Information only, not medical advice. Peptifacts does not sell anything and does not link to sellers.