Many women are deficient in Vitamin D without knowing about it. Vitamin D is important for bone health. It is also thought to play a role in the quality of eggs in the ovary as well as many other important functions in the body. If you are at risk of low Vitamin D, such as low sun exposure or darker skin types, you should have it tested with your doctor to see if you need supplementation. Vitamin D can be purchased from the pharmacy over the counter without a script.