Consult a health care practitioner prior to use if you are pregnant or breastfeeding, have kidney disorders, take other vitamin D supplements, multivitamin supplements containing vitamin D, or products containing vitamin D analogues, or 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 an adequate quantity 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 early symptoms of hypercalcemia (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 or if you develop any other symptoms. Keep out of the reach of children.