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When B12 levels become problematic: High-dose supplementation (particularly doses exceeding 1,000 micrograms daily) Frequent B12 injections without medical supervision Underlying conditions affecting B12 metabolism Concurrent use of multiple B12-containing supplements The NHS does not set an upper safe limit for vitamin B12 because harmful effects from excessive intake have not been definitively established

In this clone, the vector was inserted at the high-mobility group AT-hook 2 (HMGA2) locus, compromising gene splicing and causing the premature termination of transcription

A comprehensive search strategy was also conducted in PubMed using both MeSH terms and text words to capture studies involving human subjects and review articles

Causes of high vitamin B12 The causes fall into two broad categories: exogenous (something youre taking in) and endogenous (something happening inside your body)

Also, these are effective when the oral supplements you are consuming are not producing any results

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