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.
However, a synthetic form of Vitamin K, K3 or Menadione, is toxic and has been banned for over the counter sale in the USA because high doses can case liver cells to die and trigger allergic reactions and hemolytic anemia, in which the red blood cells are broken down.Sources & Links.he dose at which Vitamin D begins to become dangerous is a sustained intake of more than 1, 250 micrograms daily for several weeks, in adults, although lower doses are dangerous in children and fetuses and pregnant women are advised to consult a doctor before taking Vitamin D supplements.