b12 level blood draw timing relative to injection Hydroxocobalamin V. Prolonged Maintenance of High Vitamin Levels following a Short Course of Hydroxocobalamin Injections Vitamin B12 | Linus Pauling

US FDA Pregnancy Category C Product label: CYANOKIT (hydroxocobalamin) injection, powder, lyophilized, for solution [Meridian Medical Technologies, Inc.] Last revised: April 2011 [DailyMed] Nursing Mothers (FDA) Cyanide poisoning: it is not known whether hydroxocobalamin is excreted in human milk

Enhanced Cognitive Function: Regular B12 supplementation may help prevent cognitive decline

While theres no definite cutoff for when B12 starts to become unsafe, because people often ask, well somewhat arbitrarily say not to take more than 1,000 g per day over the long-term without guidance from a physician

pairs with thiamine (B1) in supportive care