When I first started taking it I was really nauseous and felt like crap. Took about a week for me to get used to it but I have no problems with it now and it works really well for me
I didn't feel dizzy. Just a weird headache. Like things racing in my head and overly awake, hard to explain. It didn't last more than a few weeks. Everyone has different reactions to things
I took it before for anxiety. I really suggest taking it during the day because it had me feeling wired/racing thoughts at night. I couldn't sleep. After changing it to the morning it was fine.