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Overdiagnosis: B12 deficiency As part of our series on conditions that may be overdiagnosed, GP partner and trainer Dr David Coleman considers why and when we might be placing too much stock on vitamin B12 deficiency Background Vitamin B12 deficiency is a relatively common condition with a range of causes and innumerable symptoms

Understanding these mechanisms becomes essential when developing an effective epithalon dosage protocol that maximizes research potential while maintaining safety standards

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This paper is an early summary by the investigators who first showed HLA class II antigen expression on thyroid cells as an important clue to aetiology