doi: 10.1016/j.neuint.2012.04.008 33 PackiasamyABalasubramaniamDBalasubramaniamNPanneerselvamC
Unlike standard IGF1, the LR3 version has two key modifications that enhance its potency and duration: The Long designation refers to an additional 13 amino acids, increasing its molecular stability The Arg3 substitution reduces its binding to IGF-binding proteins (IGFBPs), extending half-life from minutes to ~2030 hours These changes allow IGF1 LR3 to remain active in the bloodstream much longer than endogenous IGF1, resulting in greater anabolic signaling and sustained muscle growth potential
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It also addresses fine lines, wrinkles, photodamage, and uneven pigmentation
Perlmutter was ranked by Newsweek Magazine as one of the top 150 ophthalmologists in the United States, higher than any ophthalmologist in the Capital Region