Calcium, iron, folic acid, vitamin D and beta-carotene are recommended in a multivitamin for women, according to Everyday Health. Additionally, women often need supplements for vitamins B6 and B12, as well as for omega-3 fatty acids.
The body tends to use food sources more efficiently than supplements, and most nutritional experts recommend that a woman's diet should be the primary source of vitamins and nutrients, according to Everyday Health. Multivitamins help to provide nutrients that are lacking, even in a well-balanced diet.
Older women should pay particular attention to getting enough calcium, vitamin D and vitamin B12, while making sure not to get too much iron, reports Everyday Health. Calcium becomes more important with age as bone mass decreases and creates a higher risk for osteoporosis. A healthy intake of calcium is between 1,000 to 1,500 milligrams per day.
Vitamin D supports calcium absorption, and as a woman ages the ability to convert sunlight to vitamin D reduces, explains Everyday Health. A woman over the age of 50 should get 400 international units of vitamin D every day; the equivalent of four glasses of milk. If she is over 70, she should get 600 international units daily.
Other vitamins that get increasingly important as a woman gets older include B6 and B12 which help with red-blood cell formation and development, states Everyday Health. Beta-carotene defends the body against cancer and cell damage, and omega-3 fatty acids help prevent heart disease.