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For patients concurrently taking metformin, periodic B12 monitoring should be considered , particularly if you have been on metformin for several years or have symptoms of deficiency, in line with MHRA and NICE recommendations

Red Blood Cell Production & Oxygen Delivery B12 is essential for red blood cell production

And while eating B12-rich foods and take oral supplements can boost your levels, vitamin B12 injections are an increasingly popular way to supplement

"Methylcobalamin Alleviates Neuronal Apoptosis and Cognitive Decline Induced by PM2.5 Exposure in Mice"

Yes, for the right candidate, and the evidence is reasonably strong