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J., Dargan, P
This method is often the standard for anyone who needs to address low B12 levels fast, especially if they have issues with nutrient absorption
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Despite this promise, several critical limitations remain: No large-scale, randomized controlled human trials to confirm efficacy, safety, or long-term impact Toxicology and pharmacokinetic data are lacking, especially for chronic use or high-dose regimens Only one stereoisomer (all-L form) has been tested
PMID 14533134
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