Is it ok to take biotin, b-12, antioxidant supplement and a multi vitamin?

Yes: It is OK to take these, although seldom necessary in the USA if you are eating a balanced diet.

A good multivitamin: has all of those. It if always preferable to take one pill instead of a slew of pills. You could take a multivitamin and the supplement.. But do your research on multivitamins which have all of them. Try Whole Foods store.