No. While it occurs naturally in some foods and is added in others (milk, for example), you can also get it from supplements or from unprotected (no sunscreen or long sleeves) time in the sun (but do not stay out too long as you do not want to get sunburn).
milk
With
vitamin D human skin produces vitamin D when exposed to sunlight
No, vitamin D is not from jade stone. Vitamin D is an animal product. Good food sources of vitamin D are milk, eggs, fish, beef, etc. We can also produce vitamin D in our skin when it is exposed to ultraviolet radiation (usually from the sun).
Vitamin D
Food and sunlight (vitamin D).
vitamine A witch will be transformed to vitamine D by the human body
Sunshine contains the best and most efficiently absorbed vitamin D. A fair skinned person can make up to 20,000 IU's of Vitamin D in a half and hour with no risk of ever overdosing on vitamin D. Fatty fish and cod liver oil are the richest natural sources of vitamin d. Sun dried or UV light exposed mushrooms contain a surprising amount of vitamin D, up to 2500 IU's per serving. These are virtually the only significant natural vitamin D sources. Many other foods are fortified with vitamin d by the manufacturers: Bread, milk and some orange juices are fortified, but the amounts vary and the stated amount of vitamin d on the label is not always the amount the food actually contains.
An example of a Fortified food is milk. It is high in vitamin D.
There is no known good natural source of vitamin D other than exposure to sunlight. If needed, there are always Vitamin D supplements, however these aren't as efficiently absorbed compared to the natural source.
foods with vitamin d
Vitamin D absorbs calcium