XPost: misc.health.alternative, sci.med, sci.med.nutrition   
   XPost: sci.life-extension   
      
   Upper and Lower Limits for Vitamin D   
   The safe upper limit of vitamin D has been identified for the first   
   time. A study of more than a million people older than 45 shows that   
   having blood levels of calcidiol (hydroxyl vitamin D) below 20ng/mL (50   
   nmol/L) or above 36 ng/mL (90 nmol/L) increases risk for heart attacks   
   and premature death (J Clin Endocrinol Metab, published online March   
   26, 2013). An overdose, as well as a deficiency, of vitamin D markedly   
   increases heart attack risk.   
   A major function of vitamin D is to increase absorption of calcium from   
   the intestines. Some people who take vitamin D supplements raise their   
   blood levels of calcium as well as vitamin D above normal. These people   
   are at increased risk for heart attacks and premature death.   
   The only dependable blood test for vitamin D deficiency is called   
   calcidiol or hydroxy-vitamin D. If you have a calcidiol level below 20   
   ng/mL, you can raise it to 32 ng/mL by taking 30 µg (1200 IU) per day.   
   If your blood level of calcidiol is 30 ng/mL, you need to take 5 µg   
   (200 IU) per day, to raise blood levels to 32 ng/mL. If your blood   
   calcidiol level is too high (above 90 nmol/L), check with your doctor   
   about reducing your dose of vitamin D pills.   
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