In addition to supporting liver detoxification, boosting glutathione levels will also provide additional antioxidant protection, increase protection against viruses and toxins from mold exposure and give general support to the immune system
Gastroenterology 162 (5), 13961408
Contaminants in BPC-157 samples directly skew mucosal repair data, which is why researchers rely on high purity peptides for research with independently verified third-party COAs
The copper content of GHK-Cu formulations has been a theoretical safety consideration, given that excessive copper can be toxic - however, the amounts used in cosmetic and research applications are extremely small, the copper is tightly chelated by the peptide (reducing free copper availability), and topical absorption of copper from these products appears minimal and well below levels that would cause systemic copper accumulation or toxicity
doi:10.2147/CCID.S128339 Handog EB, Datuin MS, Singzon IA
GHK-Cu is sold strictly for laboratory research purposes