Vitamins - B12 - Contraindications / Precautions / Warnings

There are no reported cases of vitamin B₁₂ toxicity.

Vitamin B₁₂ is involved in the same chemical processes as folic acid and also activates this vitamin. As such, a B₁₂ deficiency often results in a folic acid deficiency. A high intake of B₁₂ may mask a folic acid deficiency and vice versa.

High levels of B₁₂ supplementation may cause acne. This situation occurs more frequently in women.