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A high HPLC area-purity figure does not automatically prove: That the main peak is BPC-157 That the sequence is correct That arginine is present That arginine is acting as the claimed counterion That the arginine-to-peptide relationship is known That the sample contains the stated net peptide amount That oral absorption has been improved That the material is sterile or suitable for administration For an arginate claim, confirming BPC-157 is only half the job

[25] The results suggested that NAC can improve insulin resistance and chronic inflammation in obese mice, by providing anti-oxidative stress benefits

Full review: GHK-Cu and Bone Research UK 2026

doi: 10.1016/j.cmet.2021.07.006 5 ChenY.LiL.WangW.SunY.DongZ.LiY.et al