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For antimicrobial protection, avoid rubber closures, which can allow contamination through the hole where the needle passes, and may contain rubber additives
Bias in meta-analysis detected by a simple, graphical test
This dose usually keeps B12 levels good for most patients
B12 deficiency is more common than widely recognized, particularly in individuals who follow plant-based diets, take proton pump inhibitors or metformin, are over 50, or have gastrointestinal conditions affecting absorption
It also promotes strong shiny hair and strong nails
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