TY - GEN AU - O'Dowd,P TI - B12 supplementation: must be parenteral SN - 1086-5462 PY - 2000///0927 KW - Administration, Oral KW - Aged KW - Dietary Supplements KW - Dose-Response Relationship, Drug KW - Female KW - Humans KW - Infusions, Parenteral KW - Male KW - Middle Aged KW - Sensitivity and Specificity KW - Vitamin B 12 KW - administration & dosage KW - Vitamin B 12 Deficiency KW - diagnosis N1 - Publication Type: Journal Article; Review ER -