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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
Pharma-grade,lab-tested for safetyand reliability
Controlled human safety, pharmacokinetic, and efficacy studies have not been published in peer-reviewed clinical literature
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If taking more than one serving per day, do your best at taking it around meals
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