Mega-doses of calcium, diuretics and thiazide increases the risk of hypercalcemia. Vitamin D reduces the effect of calcitonin when treating hypercalcemia. Digitalis preparations increases the risk of heartbeat irregularities. Phosphorous-containing medicines may release too much phosphorous into the body. Doses of 1800 IU daily can cause stunted growth in children.
Most elderly people have deficiencies, making osteoporosis worse.
Newborns are born with a 9 month supply of vitamin D. Vitamin D is stored in the body's fat cells during the summer for use during dark winter months, providing an adequate diet is followed. Because of toxicity, don't exceed 600 IU per day without a doctor's specific instructions. This Guide is intended to give you general information about vitamins, minerals and herbs. It is not intended to diagnose, prevent, or treat any kind of illness or disease. Always consult your physician before starting any major change in diet or nutrition.