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.
Risk of Liver and Brain Damage. Watch out for side effects when consuming certain vitamins -- vitamins A, B-3, B-6, C, D, E and K can cause adverse reactions if you consume too much, while vitamins B-1, B-2, B-5, B-9, biotin and B-12 are generally safe -- or when taking mineral supplements.