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The US National Academy of Medicine updated estimated average requirements (EARs) and recommended dietary allowances (RDAs) for vitamin B 12 in 1998

39.9% with placebo), with nausea, vomiting, and diarrhea peaking during dose escalation and declining thereafter, whereas constipation remained relatively constant

Excessive drowsiness, prolonged headaches, or other persistent side effects may indicate individual sensitivity requiring dose reduction or timing adjustments

BBB breakdown and dysfunction in cerebrovascular diseases lead to leakage of blood components into the brain parenchyma, contributing to neurological deficits