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What are the causes of vitamin B12 deficiency? What are the symptoms? 00:00: Introduction 00:24: What is vitamin B12 used for? 00:53: Where to find vitamin B12? 01:15: Lack of intake 02:11: Biermer's disease 03:12: Long-term use of omeprazole, esomeprazole, etc. 03:49: Bariatric surgery with ByPass 04:15: Crohn's disease 04:37: Metformin 05:17: Nitrous oxide 06:52: Onset of B12 deficiency anemia 08:03: Onset of neurological symptoms 10:12: Onset of psychiatric symptoms 10:33: Symptoms in the mouth and skin 11:28: Are you at risk of having a Vitamin B12 deficiency?