The purpose of this site is to collect lab research by medical doctors about herbs that are proven to treat illnesses and counter the false attacks on herbs by the medical industry and false claims by alternative medicine. I let the science tell the facts.
 
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Vitamin D

It seems that there may not be a d vitamin rather several types of D such ad d2 and d3 which are the most studied. The main difference is that D2 is from plants and D3 is from animal sources. See report on D3

What is important in the differences is that D2 is not natural to the body and D3 is natural or it is naturally produced in the body from UV or sunlight.

Drisdol is the synthetic form of vitamin D2; the form of vitamin D typically prescribed by doctors. It is not a natural form for the body and may lead to shortening ones life span according to Dr. Mercola

1.Wickipedia "Several forms (vitamers) of vitamin D exist (see table). The two major forms are vitamin D2 or ergocalciferol, and vitamin D3 or cholecalciferol, vitamin D without a subscript refers to either D2 or D3 or both. These are known collectively as calciferol"

Vitamin D3 (cholecalciferol) is produced by ultraviolet irradiation (UV) of its precursor 7-dehydrocholesterol. This molecule occurs naturally in the skin of animals and in milk. Vitamin D3 can be made by exposure of the skin to UV, or by exposing milk directly to UV (one commercial method).

Vitamin D2 is a derivative of ergosterol, a membrane sterol named for the ergot fungus, which is produced by some organisms of phytoplankton, invertebrates, yeasts, and higher fungi such as mushrooms. The vitamin ergocalciferol (D2) is produced in all of these organisms from ergosterol, in response to UV irradiation. However, like all forms of vitamin D, it cannot be produced without UV irradiation. D2 is not produced by land plants or vertebrates, because they lack the precursor ergosterol.[89] The biological fate for producing 25(OH)D from vitamin D2 is expected to be the same as for 25(OH)D3,[90] although some controversy exists over whether or not D2 can fully substitute for vitamin D3 in the human diet.[91] [92]

http://en.wikipedia.org/wiki/Vitamin_D

2. "The Recommended Daily Intake (RDI) of Vitamin D3 is set so low those mature individuals who consume this small amount (400 to 600 International Unites (I.U.’s)) are still likely to be deficient if they live north of the Tropic of Cancer or south of the Tropic of Capricorn. In fact, researchers have discovered that the RDI, which was considered adequate to prevent osteomalacia (a painful bone disease) or rickets, is not high enough to protect against the majority of diseases linked to 1,25-dihyroxy Vitamin D3 deficiency. For example, an analysis of the medical literature found that at least 1,000 to 2,000 IU of Vitamin D3 per day is necessary to reduce the risk of colorectal cancer and that lower doses of Vitamin D3 did not have the same protective effect." http://www.vrp.com/bone-and-joint/vitamin-d3-higher-doses-reduce-risk-of-common-health-concerns

2. "...If I were to pick out a vitamin D supplement, I would lean toward one with D3, but it may not matter that much - after all, D2 has been used for many years. What's D2 and D3 anyway? Vitamin D is a substance your body synthesizes after your skin is exposed to sunlight, however it is also available in fish oil and in foods that have been fortified with vitamin D. In your body, vitamin D acts like a hormone to help your body absorb and use calcium and regulate the amount of calcium in your blood. If you don't get enough vitamin D, you'll increase your risk of osteoporosis, or other bone-weakening diseases such as osteomalacia and osteopenia. Vitamin D is also important for a healthy immune system and normal nerve and muscle function." http://nutrition.about.com/od/therapeuticnutrition1/f/D2orD3.htm

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