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The New England Journal of Medicine, 384(11), 9891002

The extended 2030 hour half-life of IGF-1 LR3 means once-daily dosing maintains elevated IGF-1 receptor occupancy across multiple protein synthesis cycles, unlike native IGF-1s 10-minute half-life that requires frequent re-dosing

Nature 558 , 547552 (2018)

If you want a broader look at gut-focused options, the Gut Health collection is a useful next stop

Effect of methyl bromide on regional brain glutathione, glutathione-S-transferases, [PMID: 1733043] Laboratory literature summary: Effect of methyl bromide on regional brain glutathione, glutathione-S-transferases, monoamines, and amino acids in F344 rats

Natesan V, Kim SJ