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Illustrative vial: IGF-1 LR3IGF-1 LR3

Illustrative presentation

INFORMATIONAL REFERENCE

IGF-1 LR3

IGF-1 LR3 is explored for growth-factor effects on muscle-cell proliferation and differentiation. Its potential applications concern tissue-growth biology; laboratory responses do not establish safe muscle-building benefits in people.

Research focus & potential applications

Growth-factor signaling
Muscle-cell biology

What the research shows

Explore the selected studies, their findings and their limits.

Read the findings & sourcesPreclinical evidence

In cultured human skeletal-muscle cells, LR3 IGF-I increased myoblast proliferation and measures of muscle-cell differentiation. Cells grown in a laboratory are not equivalent to an intervention in volunteers. This experiment cannot establish increases in strength or safe muscle growth, and findings for native IGF-1 medicines cannot automatically be applied to the modified LR3 molecule.

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Editorial review: September 23, 2026