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However, most cases are due to excess supplementation or due to a functional deficiency, where the person is actually deficient in B12

Concentration and consistency both factor in

Synaptic tagging and cross-tagging: the role of protein kinase Mzeta in maintaining long-term potentiation but not long-term depression

Targeting 5 mg/mL requires 4.0 mL, and 2.5 mg/mL needs 8.0 mL
PMID 35115649
