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It is rather a misconception related to problems of commercial IGF-I assays at the lower end of IGF-I detection

Jundishapur J Microbiol 8(9):e28320

Though the lions share of supportive studies were conducted in animal models, they broadly paint a positive picture of the peptides therapeutic potential

IGF-I, Insulin-like growth factor-I

The peptide promotes collagen synthesis, enhances blood flow to tendons, and improves biomechanical properties

That idea is broscience
