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Patients with conditions that impair absorption may benefit more from injections, which bypass the digestive system entirely
Appetite typically returns within 10-14 days after stopping as blood levels drop below therapeutic range
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
Contact your doctor immediately if you experience any symptoms of allergic reaction such as itching, swelling, severe dizziness, rash, or difficulty breathing after receiving a B12 shot
Patients should be aware that heavy, chronic ethanol use may counteract the therapeutic effects of vitamin B12
