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Vitamin B (pyridoxine), when chronically taken in gram quantities, is known to cause a sensory neuropathy, numbness and tingling in the extremities, but the amount of B in this formula (2 mg per mL) is far below such neurotoxic levels

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Molecular Profile CAS Number: 89030-95-5 Molecular Weight: 340.38 Da (tripeptide) + Cu Sequence: Gly-His-Lys (3 amino acids) with copper coordination Purity: 100.00% HPLC-UV Format: Lyophilized blue-green powder Storage: -20C, desiccated Reconstitution: Sterile bacteriostatic water Research Context GHK-Cu is one of the most extensively studied copper-binding tripeptides in the biological research literature

Some suppliers sell HGH Frag 176-191 this may or may not include the tyrosine modification, which matters for comparing results across studies