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Low Vitamin D is believed to be the cause of many health issues with women. Depression, Breast Cancer, Fibro, Cardiac issues are all related to low D. Even though we may drink Vit. D fortifed milk, it doesn't do us any good without one key factor that helps our bodies use that D.
Sunlight! According to my endocrinologist (he was named a Top Doc on a Fibro and Thyroid board. I love him!! He listens!!) a body needs a minimum of 15minutes of sun exposure per day to make that Vit D useful to the body. Also that is 15minutes of exposure of the skin to the sun without the use of sun screen. It's in the skin that the body does it's thing with Vit D. It can be filtered sunlight but the sun screen blocks too much of a certain type of light that the body needs.
In addition, exposure to certain light on the eyes lowers symptoms of Seasonal Affective Disorder, S.A.D. a seasonal form of depression, aka the winter blahs!
I take a 3500mg D cap. once a week and my D is still borderline. Makes you wonder....... I've got S.A.D.too