B12 every2 mths hydrox NeuroSymptoms return early. Mother cannot absorb B12 in stomach Chewing Methylcobalamin better than sublingualat at what dose?

Pernicious anemia. Your mother probably has gastric dysfunction secondary to pernicious anemia, and best treatment here is not any oral form, but rather B-12 intramuscular injections, 1000 mcg every 4 weeks.