b12 injections folate deficiency Vitamin Perspective: The High-Folate–Low-Vitamin B-12 Interaction
Description
Office of Dietary Supplements

Adverse Reactions/Side Effects Generalized: Anaphylactic shock and death have been reported with administration of parenteral vitamin B 12 (see WARNINGS)
It supplies the mechanistic and directional rationale for the whole compound class, but it is not a human trial and does not establish a human dose

No serious adverse events were attributed to the compound
