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.
The review involved trials on beta-carotene, vitamin A, vitamin C, vitamin E and selenium. It says in-depth analysis of the different trials does not support the idea that vitamins extend lifespan. 'Even more, beta-carotene, vitamin A, and vitamin E seem to increase mortality,' says the review.