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Lu Y, Ho R, Lim TK, Kuan WS, Goh DY, Mahadevan M, Sim TB, Van Bever HP, Larbi A, Ng TP

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There were several deficient women who were taking a multivitamin, containing 10-400 g, as their source of B12 whereas none who were taking a B12-only supplement three times a week or more were deficient (defined as serum B12, holotranscobalamin, or mean corpuscular volume (MCV) outside of the reference range of the multiple labs used)