A multivitamin product is designed to provide essential nutrients in one place. Ideally, what they can contain is sufficient B vitamins, small amounts of vitamins A, C, D, E, and enough minerals like, chromium for blood sugar regulation, calcium and magnesium for bone health, and selenium and zinc for immune support.
It is important that multivitamins, like all isolated nutrients, be taken with food. This is in part, because isolated nutrients, even when combined with others, require many other nutrients for proper assimilation. Another reason it is beneficial to take multivitamins with food is that chewing real food releases digestive fluids, and enzymes, that help to properly digest the nutrients in the pills.