I'm am taking the multivitamin called "1 a day" and I'm taking it once a day. Would it hurt me if I took that multivitamin twice a day?
No, it wouldn't hurt however, in my opinion, Centrum is a much more complete daily vitamin than One-a-Day. Also, too much intake of certain vitamins within the "multi" vitamin can cause complications so please be careful. Enjoy your day!
Yes, too many of certain types of vitamins which are fat soluble can make you really sick. Losing your hair, vomiting, etc.
Too much of certain vitamins can be harmful. Plus you really can't absorb them all at one and you'll just pee or poop them out. That would be a waste of your money.