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For instance, they can look for high methylmalonic acid (MMA) levels in your blood to confirm B12 deficiency

Absorption problems Even with adequate intake, absorption can be reduced by: Certain gastrointestinal conditions affecting the stomach or small intestine Some medications Age-related reduction in stomach acid (which can affect absorption) Autoimmune gastritis (often historically referred to as pernicious anaemia) This is a well-recognised cause of B12 deficiency and may require ongoing management

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Promotion of cutaneous wound healing by famotidine in Wistar rats