Side effects of vitamin D include: kidney stones, kidney damage, muscle, weakness, fatigue, headache, poor, sleep, constipation, diarrhea, gas, bloating, and more! Cholecalciferol , vitamin D is the active ingredient in D-con rat poison. Not only that but taking man-made vitamins and isolated minerals throws our mineral stores out of balance, man made vitamin D, depletes magnesium. If you have a magnesium deficiency, most likely help potassium, zinc, iodine, and other mineral deficiencies. Takin