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Apr 28th, 2026 How IGF-1 LR3 Promotes Muscle Growth and Recovery IGF-1 LR3 is a synthetic, long-acting form of IGF-1 that may promote muscle growth and recovery by increasing protein synthesis, but it is not FDA-approved and lacks strong human evidence in healthy individuals

The Critical Importance of Bioavailability As we have touched upon, the biggest hurdle in supplementation is not what you take, but what you actually absorb

This rate of synthesis, combined with efficient (95%) L-carnitine reabsorption by the kidneys, is sufficient to prevent deficiency in generally healthy people, including strict vegetarians (132)

[DOI] [PMC free article] [PubMed] [Google Scholar] 47.Macpherson A.J., Uhr T