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B12 is water-soluble and considered very safe, since excess is cleared by the kidneys
A Mini-systematic Review
Reconstitute: Add 4.0 mL bacteriostatic water 12.5 mg/mL concentration
What are the guidelines for vitamin B12 sublingual dosage
On/off cycling here is driven by caution, not by tolerance data: because there is no long-term human safety record, building in scheduled off periods is the conservative research default
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