I don't use multivitamins.
Instead, I try to make sure to eat balanced. I get a blood test taken twice a year to make sure primarily the iron intake is high enough.
I used to take C vitamins, but nowadays I prefer eating fruits that are rich in C vitamins instead.
If anything, make sure that your multivitamins are LOW dosed. Particulary when it comes to fat soluble vitamins (A, D, E and K).
YIP
Zack