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What the evidence says Cellular (in‑vitro) evidence In cultured fibroblasts and endothelial cells, adding BPC‑157 to the growth medium leads to a modest but measurable increase in cell proliferation and tube‑formation assays, which are laboratory proxies for new blood‑vessel growth

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Reported side effects are typically mild and transient: BPC-157: Nausea (rare), mild fatigue in the first week, minor injection site redness TB-500: Mild lethargy in the first weeks, transient head rush immediately after injection, injection site discomfort Combined stack: No documented synergistic toxicity in preclinical or clinical observational data The more significant risks relate to sourcing and administration rather than the peptides themselves