Hi Miracle
Vasodilation can cause headaches. Vasodilation can also lead to low blood pressure, which would predispose one to fainting and dizzy spells. Especially while working out, or when standing from a lying position.
Yes, you can try cutting it in half and see if that helps. If not, I would stop taking it.
Hope that helps, and I'm here for you if you have more questions.
Kerry
__________________
Kerry, RN
Please click the accept button if this has helped you. A bonus is always appreciated as well.