I've never had Vegemite, but I still think this ban is ridiculous. After reading about folate/folic acid on Wiki, it seems like the only risks of high folate levels are masking of B12 deficiencies and interference of antimalarial treatments, and evidence for both risks aren't 100% confirmed. Actually, it's supposed to be like some kinda miracle vitamin. There's no real reason to ban Vegemite solely because of its folate content. Stupid US.