Individual vitamin supplements are designed for those who need a specific vitamin, rather than all the vitamins included in a multivitamin supplement. Individual vitamins may be helpful for those with a specific nutritional deficiency, as an individual vitamin supplement may contain higher doses of a particular vitamin than others. Because different vitamins work against different parts of the body and metabolic process, it also allows the user to target their supplements to a specific health benefit or problem. Vitamins work differently throughout the body and a vitamin deficiency can cause a number of health problems.