Some experts say that a fact is common knowledge if it can be found in three independent sources. Purdueâs Online Writing Lab recommends finding five independent sources before considering a fact common knowledge. The point is that common knowledge can be found in a variety of sources.
VITAMIN D. Vitamin D and vitamin A are the most toxic of the fat-soluble vitamins. The symptoms of vitamin D toxicity are nausea, vomiting, pain in the joints, and loss of appetite. The patient may experience constipation alternating with diarrhea, or have tingling sensations in the mouth.
Vitamin D toxicity can lead to hypercalcemia (high levels of calcium in the blood). This condition can cause serious problems, such as kidney failure, abnormal heart rhythms, and coma. You're unlikely to develop vitamin D toxicity from too much sunlight or from the amount present in foods.