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Association between metformin and vitamin B(12) deficiency in patients with type 2 diabetes: A systematic review and meta-analysis

Maybe I'll ramp it up to four

Underdosed products: Anything below 200mg per serving is unlikely to provide meaningful support for most adults

As we age, our stomachs produce less hydrochloric acid or stomach acid, which is needed to absorb B12

however, this reduction was prevented by glutathione supplementation (7.23 0.02)
