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Those with a diagnosed deficiency - usually through a symptom checker alongside a simple blood test - will be prescribed and offered regular vitamin B12 intramuscular injections through their GP practice, district nurse, or NHS services
Vitamin B12, Proceedings of the Third European Symposium on Vitamin B12 and Intrinsic Factor
If you think you're low on B12, get a blood test
The product should be kept in a refrigerator when not in use, and not left at room temperature for prolonged periods, except for drawing up a dose
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