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Pregnancy and lactation period

This may be a physiological role (in situ hybridization and immunostaining BPC 157 in human gastrointestinal mucosa, lung bronchial epithelium, epidermal layer of the skin and kidney glomeruli), and BPC 157 may act as stabilizer of cellular junction, leading to significantly mitigated leaky gut syndrome, via increasing tight junction protein ZO-1 expression, and transepithelial resistance [19]

Thats the cellular argument

Some practitioners find that subcutaneous injection in the abdomen produces fewer GI side effects than thigh injections, though this is anecdotal rather than evidence-based