You might want to take magnesium with Vitamin D, because taking vitamin D depletes magnesium. Not sure if it's strictly necessary, but if you're already low on magnesium it might be an issue. I once got tinnitus (which lasted a few months) when supplementing Vitamin D, the only explanation I've figured is that my magnesium was very low, which can cause tinnitus. Might be something else too, who knows.