In contrast, by the 1990s, most iron came from fortified breakfast cereals where the iron is less bioavailable than from meat.
A raw diet will provide your cat with unprocessed bioavailable nutrients.
Vitamins and minerals are destroyed by cooking; 84% of the vitamins are destroyed and the minerals and protein become less bioavailable in cooked food.
Vitamins from natural sources are more bioavailable than from supplements.