维生素 B12

美国每日参考值（DV，成人）：2.4 mcg · 标签常用单位：mcg

参考摄入量

数值美国中国欧盟
标签参考值标签上百分比的基准，由各法规规定；不是推荐摄入量2.4 mcgDV · 成人及 4 岁以上儿童12.4 mcgNRV32.5 mcgNRV5
推荐摄入量（成人）2.4 mcgRDA · Adults 19+22.4 mcgRNI · Adults 18+44 mcgAI6
可耐受最高摄入量未列出未列出Not derived (ND)UL7
  1. FDA, 21 CFR 101.9(c)(8)(iv), Daily Values for adults and children 4 years and older
  2. NIH Office of Dietary Supplements, Vitamin B12 fact sheet for health professionals (2025)
  3. GB 28050-2011 General rules for nutrition labelling of prepackaged foods, Appendix A nutrient reference values (NRV); value unchanged in GB 28050-2025, Appendix A (published 16 March 2025, in force 16 March 2027) (2025)
  4. Chinese Nutrition Society, Chinese Dietary Reference Intakes (DRIs 2023) (2023)
  5. Regulation (EU) No 1169/2011, Annex XIII Part A, nutrient reference values (consolidated text) (2011)
  6. EFSA NDA Panel, Scientific Opinion on Dietary Reference Values for cobalamin (vitamin B12) (2015)
  7. EFSA, Tolerable upper intake levels for vitamins and minerals (Scientific Committee on Food / NDA Panel) (2006)

标签值（DV、NRV）是标签上百分比背后的参考点。推荐摄入量与最高摄入量按所列机构原样引用；它们因年龄、性别与生理阶段而异，且都不是建议。