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Peptides / investigational growth-factor analog
IGF LR3
IGF-1 LR3 is a research growth-factor peptide marketed for muscle growth. Its modified structure makes it different from ordinary IGF-1 and approved mecasermin. There is no good controlled human evidence showing what muscle gains users can expect. Uncertain blood-sugar effects and degraded or inconsistent products are the main concerns.
No controlled human bodybuilding trials establish efficacy or safety. Evidence about prescription mecasermin, ordinary recombinant IGF-1 or circulating IGF-1 cannot be transferred to LR3.
Hypoglycemia, edema, headache, tissue-growth concerns, unknown long-term cancer and cardiovascular implications, and unregulated-product and injection risks.
Urgent assessment for symptomatic hypoglycemia; glucose, edema and unexplained tissue-growth symptoms require clinical context. No monitoring scheme establishes safe use.
Never approved for human use and prohibited in sport; black-market products may be oxidized, mislabeled or otherwise poor quality.
Other aliases: IGF LR3 · Long R3 IGF-1 · Long R3 Insulin-like Growth Factor 1
Confirmed that Long R3 IGF-I is an unapproved black-market bodybuilding product and documented oxidized, lower-quality forms.
This was not a human efficacy or safety trial; rat and laboratory findings cannot establish safe human use.
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