glutathione vs bpc 157 GLP-1 and Glutathione: Understanding the Relationship and Clinical Applications Glutathione! - PMC
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doi:10.1016/j.molimm.2006.09.030 [19] Bdis J, Tinneberg HR, Schwarz H, Papenfuss F, Trk A, Hanf V

Dogs who do not have a condition that affects their ability to absorb it and who eat a complete and balanced diet likely wont need supplements
Nick & Dr
Pizzorno J

They are not for human use