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Symptoms of real deficiency include fatigue, tingling or numbness in hands and feet, memory and concentration issues, mouth ulcers and pale skin, and a GP blood test is the only reliable way to confirm it

they can then claim you used product at of date

The mechanisms behind B12 deficiency in metformin users are multifactorial but are probably related to intestinal absorption, so it seems sensible to assume that oral B12 replacement may be less effective, although there is little evidence in this area

Morning or night

With injections, you get a much higher absorption rate without the hassle of taking a daily supplement