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VITAMIN B12-B6-FOLATE TREATMENT IMPROVES BLOOD-BRAIN BARRIER FUNCTION IN PATIENTS WITH HYPERHOMOCYSTEINAEMIA AND MILD COGNITIVE IMPAIRMENT Based on this, taking prompt action is crucial, especially when B12 deficiency has progressed to the neurological stage, where damage could become irreversible

Red blood cell, neurological, and DNA production require vitamin B12

What Is vitamin B12

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I've also tried the private route, but with little luck