NOW Vitamin D-3 softgels supply this key vitamin in a highly absorbable liquid softgel form. Vitamin D is normally obtained from the diet or produced by the skin from the ultraviolet energy of the sun. However, it is not abundant in most foods. As more people avoid sun exposure, vitamin D supplementation becomes even more necessary to ensure that your body receives an adequate supply. Recommended Dosage: (Adults) Take 1 softgel daily. Consult a health care practitioner for use beyond 6 months. Take with adequate calcium.Consult a health care practitioner prior to use if you are pregnant or breastfeeding, if you have kidney disorders or if you take other vitamin D supplements, multivitamin supplements containing vitamin D, products containing vitamin D analogues,  if you take any prescription medications including antacids, anticonvulsants, digoxin, cholestyramine, colestipol, mineral oil, steroids, statins or thiazide diuretics. 15-20 mcg (600-800 IU) of vitamin D per day is adequate for most individuals. Consult a health care practitioner to determine if you would benefit from additional vitamin D before taking this product. Do not use this product if you have hypercalcemia and/or hypercalciuria. Stop use and consult a health care practitioner if weakness, fatigue, drowsiness, headache, lack of appetite, dry mouth, metallic taste, nausea, vomiting, vertigo, ringing in the ears, lack of coordination and muscle weakness occur, which are early symptoms of hypercalcemia, or if you have any other side effects.