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Seek medical advice if you are taking B12 supplements and experience: Persistent skin changes, particularly acne-like eruptions or rosacea worsening Unexplained headaches or dizziness that coincide with supplement use Gastrointestinal symptoms including nausea or abdominal discomfort Any allergic reactions such as rash or itching Call 999 or go to A&E immediately if you experience: Difficulty breathing Swelling of the face, lips, tongue or throat Severe rash or itching Other symptoms of severe allergic reaction after taking B12 These symptoms warrant review of your supplementation regimen
Malabsorption (inadequate intake of vitamin B12 in the intestine) Insufficient production of intrinsic factor (a protein that is produced in the gastric mucosa and is required for the absorption of vitamin B12), Diseases in the terminal part of the ileum (part of the small intestine), eg
When your internal production slows down, supplemental support may help maintain optimal cellular function
UK regulatory resource
Wilson, J.W.,Djukanovic, R., Howarth., P.H., Holgate, S.T., Inhaled beclomethasone dipropionate downregulates airway lymphocyte activation in atopic asthma
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