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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 during the loading phase, 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

Whether injected NAD+ meaningfully improves energy or aging in healthy adults is an open research question, and results vary from person to person

Combination-Protocol Research Beyond the individual studies referenced above, several published research lines have specifically investigated BPC-157 and TB-500 in combination : Combined BPC-157 + TB-500 in musculoskeletal injury models searches across rodent rotator-cuff, Achilles tendon and ligament transection research

This added step can limit how much B12 your body takes in