b12 and folic acid injection Ceva Vitamin Vitamins Injections - Vitamins A,

Even the National Institutes of Health website will tell you there is no toxicity to B12

Long-term storage (months to years): Freeze the lyophilized vial at 80 C (112 F)

Both cite the Institute of Medicine which has not established a "Tolerable Upper Intake Level" for vitamin B12, despite having done so for other nutrients as their source

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Effects of the MTHFR Mutation: Reduced Folate Metabolism: Folate (vitamin B9) is essential for many processes in the body, and MTHFR mutations can hinder the conversion of folate to its active form (5-MTHF)