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Scientific References Frequently Asked Questions Can you have too much vitamin B12
The practical sweet spot lands between 300-500mcg daily for most individuals
A 2020 study of "wellness" B12 injections in non-deficient adults found no improvement in energy, mood, or cognitive function versus placebo at 4 weeks (Wolffenbuttel et al., Nutrients , 2020)
In the future, priority should be given to advancing clinical trials, optimizing injectable formulations and administration regimens, addressing environmental and cost issues in production, and strengthening synergistic research with other preparations to enhance its application value and promote the leap from scientific research to clinical practice
FDA said it did not appear on the 503B bulks list and was not eligible for the compounding exemptions discussed in that letter
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