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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
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Consistency is key for maintaining hormone balance and appetite control
Every week, patients ask me a version of the same question
Schalkamp A-K, Harrison NA, Peall KJ, Sandor C
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