Parental side effects?

Has anyone experienced an side effects after taking prenatals? I have a weird thing and the only difference is the prenatal. Since I began taking them, my hair has a strange smell...almost like its burnt. It doesn't matter if I've just washed it, let it air dry, or styled it, or if it's clean or dirty. It's the strangest thing. Anyone else experiencing this or know what is causing that to happen?