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If you suffer from chronic headaches, you may be interested in nutritional supplements to prevent or treat headaches, especially if you can't tolerate medications
Allen LH
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Vitamin D Recommended Test : I recommend testing for vitamin D deficiency with the Vitamin D 25-Hydroxyvitamin or 25(OH)D test, then retesting within three months once you start supplementing, to make sure that you are getting enough, but not too much
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