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Severe or prolonged B12 deficiency can lead to a range of neurological manifestations, including peripheral neuropathy, which may present as pain, paraesthesia (pins and needles), or altered sensation in the extremities

The blood-vessel signaling associated with GHK-Cu, BPC-157, and TB-4 creates a theoretical concern, not a measured human tumor risk

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For additional guidance on research protocols, our peptide stacking guide provides context on combining multiple peptides with different half-lives in the same research protocol