Consult a physician prior to use if you are pregnant or breastfeeding, if you have kidney disorders, if you take other vitamin D supplements, multivitamin supplements containing vitamin D, or products containing vitamin D analogues, or 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 physician 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 physician 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 (which are early symptoms of hypercalcemia) occur, or if you experience any other side effects. Keep out of reach of children.