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Study designs that require repeated sampling across multiple tissue sites, for example, may lean on IGF-1 LR3's longer window to reduce the number of administrations needed, while designs isolating a single site of injury or load may prefer PEG-MGF specifically because its action stays contained rather than becoming systemic
Many serums and creams incorporate this ingredient for its proven efficacy
None of them is FDA-approved for muscle building, several are prohibited in competitive sport, and material sold as "research use only" is not verified for content a published NMR analysis found an undeclared constituent in a custom-synthesised peptide (Choules et al., Journal of Pharmaceutical and Biomedical Analysis , 2020)
