Supplementation is unnecessary if parenteral therapy repletes serum levels, but individual assessment is advised
Because of this and the fact that the body only needs a small amount of vitamin B12 each day, it can take up to a year or even longer for an inadequate vitamin B12 to manifest as an apparent deficiency
StatPearls [Internet], 2023 June Takaaki Sugihara, Masahiko Koda, Toshiaki Okamoto, Kenichi Miyoshi, Tomomitsu Matono, Kenji Oyama, Keiko Hosho, Jun-ichi Okano, Hajime Isomoto, Yoshikazu Murawaki
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