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And one of the things that BPC 157 has been shown to do in animal studies, and I really want to emphasize, animal studies, because that's where the vast, vast, vast majority of data on BPC-157 come from

This group helps form the disulfide bond in glutathione's structure

What Should You Know About Glutathione Supplement Forms and Absorption

Proc Natl Acad Sci USA 101: 33813386, 2004

Roth E, Oehler R, Manhart N, et al

3-PH can obtain an amino group from glutamate and form 3-phosphoserine (3-PS) through phosphoserine transaminase (PSAT) followed by dephosphorylation through serine phosphatase (PSPH) to finally produce serine (Figure 1)