The honest answer is that oral BPC-157 probably delivers less systemic peptide than equivalent injectable doses
Wei Hu, Zhi Yang, Wenwen Yang, Mengzhen Han, Baoping Xu, Zihao Yu, Mingzhi Shen, Yang Yang, Roles of forkhead box O (FoxO) transcription factors in neurodegenerative diseases: A panoramic view, Progress in Neurobiology, Volume 181, 2019, 101645, ISSN 0301-0082,
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Known to stimulate collagen production and improve skin elasticity, GHK-Cu plays a key role in promoting smoother, firmer skin and accelerating wound healing