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Put two entries side by side — evidence, mechanism, risks, and community claims.
IGF-1 LR3
Limited
Banned in sport
Summary
Long-acting IGF-1 analog used in bodybuilding research circles for hypertrophy; significant risk profile.
Categories
Performance, Growth Hormone Axis
Mechanism
Activates IGF-1 receptor signaling driving protein synthesis, satellite cell activity, and glucose uptake.
Half-life
~20–30 hours (much longer than native IGF-1)
Routes
Intramuscular injection; Subcutaneous injection
Legal / access
Unapproved for bodybuilding; WADA prohibited; research chemical legal gray areas apply.
Key risks
- Hypoglycemia
- Water retention
- Carpal tunnel–like symptoms
- Possible visceral organ growth
Common claims
- Localized muscle growth (site enhancement myths)
- Recovery and pumps
- Recomp
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