Diet/vitamin supplements?

Hi everyone, I want to take some kind of vitamin supplement and know that it must not contain vitamin A.  I sent a friend to the chemist today (in hermit mode due to massive breakout) and told her to tell the pharmacist that I am on Roaccutane and mustn’t take anything containing vitamin A.  She came back with a multivitamin which, although it doesn’t contain vitamin A, contains beta-carotene.  I presume therefore that I can’t take this?  You would have thought a pharmacist would know (!)…She