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Vitamin C in extremely high doses (more than 1000 mg taken with a b12 supplement) may reduce b12 absorption when taken together
The benzyl alcohol preservative maintains sterility within this window

They advised annual monitoring of serum vitamin B12 levels in patients treated with metformin, especially those receiving high doses and those who received treatment for an extended period [71,72]

Both offer unique benefits, but choosing the right one can impact your experience with the medication

Genes tell the body how to make enzymes
