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The FDAs questions specifically relate to microbiology, assays, impurities and stability for both the lyophilized product and the final reconstituted drug product

Xu H, et al

doi: 10.1108/nfs-01-2024-0030 93

IGF-1 is primarily synthesized in the liver, and then binds to specific receptors of cellular structures inside the bodymost notably, in bones, muscle, and cartilage

Epitalon treatment led to telomere elongation and reduced chromosomal aberrations in aging subjects. Korkushko et al., Neuro Endocrinology Letters IGF-1 LR3 For advanced users, this potent growth factor supports lean muscle retention, tissue repair, and nutrient partitioning