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doi: 10.1186/1475-2891-3-15

Lee, WMS

Chang and colleagues in Taiwan showed in 2014 that BPC-157 upregulated growth hormone receptor expression in tendon fibroblasts

Since it is made by the cell, it would make sense to believe that rate of synthesis is regulated by cells

NAC is a special form of the amino acid L-cysteine (it's "acetylated", aka, acetylcysteine)