The lot-specific COA matched the assay we ran in-house purity is exactly as stated
Zuidema J, Kadir F, Titulaer HAC, Oussoren C
They paired the IGF-1 precursor protein with another protein, CTB, which helps ferry the fused proteins from the digestive tract into the bloodstream
10.1016/j.molstruc.2013.01.049 37 GaoT
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Here are a few things to keep in mind: Purity and Sourcing Make sure the product comes from a reputable manufacturer that provides certificates of analysis (COA) or third-party testing