RT Book, Section A1 Go, Joyce A2 Olson, Kent R. A2 Anderson, Ilene B. A2 Benowitz, Neal L. A2 Blanc, Paul D. A2 Clark, Richard F. A2 Kearney, Thomas E. A2 Kim-Katz, Susan Y. A2 Wu, Alan H. B. SR Print(0) ID 1174607272 T1 VITAMINS T2 Poisoning & Drug Overdose, 7e YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9780071839792 LK accessmedicine.mhmedical.com/content.aspx?aid=1174607272 RD 2022/06/26 AB Acute toxicity is unlikely after ingestion of vitamin products that do not contain iron (for situations in which iron is present, see Iron). Vitamins A and D may cause toxicity, but only after chronic use. Serious toxicity has been reported in individuals attempting to mask urine drug screens by ingesting large quantities of niacin.