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Amazon/eBay sellers Many sell mislabeled or fake peptides (e.g., "BPC-157 Blend" with amino acids instead of pure peptide) 35

Studies have shown that IF significantly enhances GH secretion and elevates insulin-like growth factor binding protein 1 (IGFBP1) levels up to fivefold [42], thereby modulating IGF-1 bioavailability and enhancing autophagy, lipolysis, and muscle preservation [42, 43]

And this is important both in terms of thinking about what effects you're going to get of taking a given peptide, if you decide to do that, as well as potential side effects, as well as things like how to adjust dosage and how long to take a peptide, whether or not to cycle the peptide, et cetera

The only thing that changed is the concentration