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Hydroxocobalamin: Often used in injectable B12 formulations, hydroxocobalamin has a longer duration of action than cyanocobalamin
Studies comparing GHK (apo) vs GHK-Cu consistently show reduced activity for the copper-free peptide
They are also more likely to have tinnitus
The manufacturing process for vitamin b1, b6, and b12 involves series of steps including drug development, synthesis, formulation, and filtration etc
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