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Description
45 A longer-term placebo-controlled study found that vitamin B12 deficiency absolute risk was 11.2% greater in the group treated with metformin and the number needed to harm was 8.9 per 4.3 years

And if you're over 50, your ability to extract B12 from food naturally declines

Hospitals and Healthcare Facilities

The dose is usually defined between 200 and 500 mcg per day
