Prohormone & Supplement Ingredients:

Vitamin D3 (cholecalciferol)

Vitamin D is well-known for helping to maintain calcium levels and in building strong bones. Vitamin D deficiency can increase the risk of osteoporosis. Elderly who don't get enough vitamin D have weaker muscles and are more prone to falls, which could further increase the risk of fractures.

Recent research has revealed new roles of vitamin D. Many types of cells in the body can use vitamin D to help regulate critical functions. A vitamin D deficiency could result in potential problems such as a weakened immune system and an increased risk of cancer. Impaired immune function could lead to a greater risk of autoimmune diseases like type 1 diabetes and multiple sclerosis, and heighten succeptibility to some infectious diseases such as tuberculosis. Studies also suggest low levels of vitamin D may be linked to heart disease. Other stidies have determined vitamin D plays a role in controlling blood pressure and preventing artery damage.

There is no solid consensus on the amoutn of vitamin D needed. The human body produces vitamin D3 when skin is exposed to sunlight. However, in our indoor oriented world, most indoviduals (especially those in northern climates) don't get enough sun exposure for their bosy to produce adequate vitamin D3. When it comes to supplementation, indoviduals have taken up to 10,000IU daily without adverse effect. Between 2,000IU - 6,000IU appears to be adequate supplementation for the majority of the population.

If you decide to supplement, look for vitamin D3 (cholecalciferol) as opposed to vitamin D2 (ergocalciferol). Vitamin D3 has much more bioavailability than vitamin D2.

I happen to be a big proponent of vitamin D. My wife, especially, has found significant improvement in her seasonal affective disorder by supplementing with vitamin D3.
Supplements with this ingredient:
ERGOPURE (Test Boosters/Hormone Regulation)
Stage II Evolution PCT Rejuvenation (Post Cycle Support)
Testavate 500 (Test Boosters/Hormone Regulation)

Links to additional information on Vitamin D3 (cholecalciferol)
Vitamin D3 and Calcium (Added on 2/18/2011)
The Skinny On Vitamin D (Added on 2/24/2011)
The anabolic effects of vitamin D-binding protein-macrophage activating factor (Added on 2/24/2011)

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