You should discuss B12 testing and supplementation with your GP if you have risk factors such as long-term metformin use, restricted diet, significant weight loss, or symptoms of deficiency including neurological changes or unexplained fatigue
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doi: 10.1016/S0140-6736(03)15268-3 [DOI] [PubMed] [Google Scholar] 7.Chinese Society of Health Management, Chinese Nutrition Society, Reproductive Medicine Branch of China International Exchange and Promotion Association for Medicine and Healthcare, China Health Promotion Foundation, Zhejiang Provincial Clinical Nutrition Center
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(PubMed) Gomez-Sierra T, Molina-Jijon E, Tapia E, et al
Vitamin B12, Vitamin B6, Vitamin B complex which includes B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B7 (biotin), B9 (folate)