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This includes confirmed low serum vitamin B12 levels, pernicious anaemia, malabsorption states such as coeliac disease, inflammatory bowel disease, or post-gastric or bariatric surgery, unexplained anaemia, neuropathy or neurological symptoms consistent with vitamin B12 deficiency, a long-term vegan diet with symptoms or low levels, or failure of oral vitamin B12 supplementation

The same can be said for losing weight

Lets clear up some of the most common points of confusion

IGF-1, for example, is commonly monitored during growth hormone secretagogue therapy, while additional tests depend on the clinical indication and the individual patient