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However, limitations exist in the form of in vivo instability, the reliance on carriers that are biocompatible and robust and limited sites of application (local and direct) (Park et al
Adults usually start with 1000 mcg (1 mg) of vitamin B12
Individual peptide use costs half that but delivers less than half the metabolic outcome due to cofactor and pathway limitations
Rare side effects: Although rare, there are some more serious side effects that can occur with vitamin B12 injections
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