Common forms include cyanocobalamin (most common in over-the-counter supplements) and methylcobalamin
High doses of B12, often used to treat deficiencies, may cause side effects such as headaches, nausea, diarrhea, fatigue or weakness, and tingling in the hands and feet
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When you suffer from B12 deficiency, the myelin sheath around your nerves is stripped away
In our experience from member comments, no primary care doctor in the UK has access to, or has heard of, this test
