WEB DESK: Among all the vitamins, vitamin D is essential too. It is necessary to have decent amount of it in human body for stronger bones after calcium. The deficiency of vitamin D takes a person towards different health issues. Therefore, it is foremost to have knowledge about vitamin D and its effectiveness. There are symptoms that tell whether a person is deficient in it or not which everyone should know in order to save himself from any major health problems.  

Here is the video about symptoms of vitamin D's deficiency.

Source: David Wolfe