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In one late 1990s study, (6) a clinical trial was conducted on eight male test subjects with a concentration escalation design https://dailymed.nlm.nih.gov/dailymed/image.cfm?name=VED-Vit+B12+1X-18.jpg&id=312344 b12 deficiency GM:10mg Vitamin B12 Status Upon Short-Term Intervention with a Vegan Diet—A Randomized Controlled Trial in Healthy Participants
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