Hi and thank you so much for this query. I am so sorry to hear about this difficulty choosing multivitamin pills for your dad. If he eats well, there is no reason to go on vitamin supplements. If he really wants to, then Revital is the one I prescribe often. Multivitamins only help those who do not get enough from diet. And remember he may have excesses consuming them daily without proper reasons of doing so. I hope this helps. I wish you well. Thanks for suing our services and feel free to ask for more information and clarifications if need be.