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Human clinical trial activity is emerging but limited
A 30 mg vial at 10 mg/mL needs 3.0 mL, at 5 mg/mL needs 6.0 mL, and at 2.5 mg/mL requires 12.0 mL
Conclusion Most people get enough vitamin B12 from their diet, but some may experience a deficiency
High-dose or poorly formulated over-the-counter products are more likely to cause issues than a medical-grade drip or injection from a reputable clinic
But controlled human data does not exist
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