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Self-administration is not routinely offered in the NHS unless there are exceptional circumstances and a formal arrangement is in place

Both vial and pen formulations should never be frozen, as ice crystal formation can damage the medication's molecular structure and render it ineffective

Those following vegan or vegetarian diets (limited dietary B12 intake)

Contraindications: allergy to ingredients, certain liver/kidney conditions, or B12 sensitivity.

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B12 also treats vitamin deficiencieswhich could lead to anemia, fatigue, and other health concerns