Taking 2 milligrams or less a day of vitamin B12 in supplements is unlikely to cause any harm.
doi: 10.3389/fmed.2025.1737326 Received 01 November 2025 Revised 21 December 2025 Accepted 22 December 2025 Published 12 January 2026 Volume 12 - 2025 Edited by Xingli Xu, Qilu Hospital of Shandong University, China Reviewed by Qunye Zhang, Shandong University, China Di Lu, Capital Medical University, China Updates Copyright 2026 Liang, Gao, Wang and Zhao
In 2023, a study by the American Medical Association found that improper coding and documentation of therapeutic injections resulted in over $500 million in denied claims for healthcare providers
[PMID: 19733091] PubMed record related to this compound for laboratory literature review
Javier-DesLoges J, Nelson TJ, Murphy JD, et al