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b12 injections in thigh video How to Give a Injection: Step-By-Step Instructions Treating Severe Vitamin B12 Deficiency
Description
Oral intake of B-12 may be hindered by stomach acids, limiting its effectiveness

Lancet 390 (10113), 26272642
It suggests to me that you were given it when you didn't need it and if this is the case I'm not surprised at your skin's reaction

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