Vitamin D

Oh wow, so I'm on this Dr. Mercola Site and he has really interesting video on Vitamin D. He says it's actually a potent repair and maintenance steroid hormone responsible for the regulation of over 2000 genes. This is why it's so critical to health. Here's more info from Dr. Mercola's site:

Vitamin D is important for weight control, hypertension and calcium absorption.

A study by Dr. William Grant, Ph.D., internationally recognized research scientist and vitamin D expert, found that about 30 percent of cancer deaths -- which amounts to 2 million worldwide and 200,000 in the United States -- could be prevented each year with higher levels of vitamin D.

The ideal way to get vitamin D is by exposing your skin to appropriate sunlight. Unfortunately for most of us there simply isn’t enough sun exposure for nearly half of the year. However, even in the sun many of us are modern day cavemen and we spend the majority of the time the sun is out shining inside at work or in our home. Not many of us are regularly out in the sun. Sun exposure (without sunscreen) of about 10 to 15 minutes a day, with at least 40 percent of your skin exposed, is a general guide of how much you need, although people with dark skin will need to stay out significantly longer.

It is important to understand that in the summertime, when you put on your bathing suit and sunbathe for 30 minutes, your body produces about 20,000 IUs of vitamin D -- as much as exists in 200 glasses of milk, or the equivalent of about 50 typical multivitamins!

A third option is taking a high-quality vitamin D supplement. The most important thing to keep in mind if you opt for oral supplementation is that you only want to supplement with natural vitamin D3 (cholecalciferol), which is human vitamin D. Do NOT use the synthetic and highly inferior vitamin D2.

Vitamin D Testing Guidelines