The best multivitamins for women should contain at least 18 mg of iron and 400 mg of folic acid. Vitamin D should also be included in supplements because it is useful for maintaining bone health. 

In older age, the bones in the body become weak and brittle and this can lead to osteoporosis. You can know more about vitamin D in multivitamins which is also beneficial in reducing the risk of rheumatoid arthritis and colon cancer.

The age of 40 and over is considered a crucial age for women and this is the time when she needs to maintain good health. At this age, if a woman does not compensate for the loss of nutrients, she may face various problems related to the heart, skin, and bones. 

Women over 40 years of age should take a multivitamin that contains at least 25 µg of vitamin B12. Multivitamins should also contain vitamin D and 2500 IU of vitamin A. The latter is useful for maintaining healthy bones and tissues, boosting the immune system, and improving eyesight. 

Vitamin B12 is useful for improving memory and the nervous system of women, and for relieving depression. Apart from this vitamin, vitamin K should also be included in a multivitamin supplement because it helps prevent blood clots and maintains a healthy heart.

On the other hand, besides consuming the best multivitamins for women, a healthy diet and regular exercise are also needed to keep the body healthy and avoid various diseases. 

If you are not sure which multivitamin best suits your body's needs, it is best to consult a doctor before choosing a supplement to make sure it benefits you and your body.