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Typically, studies tend to be conducted In Vitro first, so within a lab or test tube environment, before moving on to In Vivo when it is deemed safe enough to do so

Synergistic Tissue Repair and Regenerative Biology In highly controlled laboratory environments, BPC-157 is rigorously studied for its critical involvement in cellular signaling, angiogenesis-related pathways, nitric oxide (NO) modulation, and localized tissue integrity models

JAMA pediatrics , 173 (4), 319325

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