Most people do not get enough vitamins and minerals in their daily diet. In these cases, a nutritional supplement can be very useful to replace the vitamins and minerals lost during the day. Most likely to need a supplement to fill gaps in the diet are those on low-calorie diets, those who have been ill, and those who do not have a varied enough diet (eg vegetarians or people with food allergies). As science and technology have developed, differences have been found in the daily needs of men and women, and a men’s vitamin supplement provides the vitamins and minerals that men need more often and is therefore more effective for men.