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In addition to serum B12, more accurate markers include methylmalonic acid (MMA) and homocysteine levels , especially for people with MTHFR mutations
Certainly helped me to know that, though,by ruling out anything more serious
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For example, long-term use of oral contraceptives may lower levels of Vitamin B2 (riboflavin) , while some diabetes and epilepsy drugs affect Vitamin B12 (cobalamin) levels
