You don't need "much benefit" if the purpose is to avoid a deficiency disease, unless you're eating a really exotic diet (or have an absorption disease, but that's not in the remit of once-a-day vitamins), it's just to "top off" your normal diet. Especially since they come with instructions to take them with food to improve absorption.

Any specifics on this claimed problem? Like some interacting with others, or with various foods?