Wendy Schnitzer

By Dr. Mercola

It’s a tragedy that dermatologists and sunscreen manufacturers have done such a thorough job of scaring people out of the sun. Their widely dispersed message to avoid the sun as much as possible, combined with an overall cultural trend of spending more time indoors during work and leisure time, has greatly contributed to the widespread vitamin D deficiency that’s seen today.

There are only 30,000 genes in your body and vitamin D has been shown to influence over 2,000 of them. That is one of the primary reasons it influences so many diseases (as seen in the table below).

• Vitamin D deficiency is epidemic in adults of all ages who have increased skin pigmentation, such as those whose ancestors are from Africa, the Middle East, or India, who always wear sun protection, or who limit their outdoor activities.

• African Americans and other dark-skinned people and those living in northern latitudes make significantly less vitamin D than other groups.

• 60 percent of people with type 2 diabetes have vitamin D deficiency.

• Studies showed very low levels of vitamin D among children, the elderly, and women.

• One U.S. study of women revealed that almost half of African American women of childbearing age might be vitamin-D deficient.

Vitamin D and Cancer

Given that cancer, heart disease and diabetes are three of the top causes of death in the United States, ensuring that you are getting enough of this crucial vitamin should be a top priority.

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.

Vitamin D has a protective effect against cancer in several ways, including:

• Increasing the self-destruction of mutated cells (which, if allowed to replicate, could lead to cancer)
• Reducing the spread and reproduction of cancer cells
• Causing cells to become differentiated (cancer cells often lack differentiation)
• Reducing the growth of new blood vessels from pre-existing ones, which is a step in the transition of dormant tumors turning cancerous

Beyond cancer, the researchers pointed out those increasing levels of vitamin D3 could prevent diseases that claim nearly 1 million lives throughout the world each year! And other studies showed that you can decrease your risk of cancer by MORE THAN HALF simply by optimizing your vitamin D levels with sun exposure.

Worried About Getting the Flu? Optimize Your Vitamin D

As we enter into flu season in the United States, you should know that your vitamin D levels play a direct role in your risk of getting the flu.

Vitamin D levels in your blood fall to their lowest point during flu seasons. If you have low vitamin D, you will not be protected by your body’s own antibiotics (antimicrobial peptides), which are released by vitamin D. This means that a person with a low vitamin D level is more vulnerable to contracting colds, influenza, and other respiratory infections.

Unfortunately, conventional medicine’s answer to preventing the flu is the flu shot. What they don’t tell you is that flu shots don’t work.

A recent study published in the October issue of the Archives of Pediatric & Adolescent Medicine found that vaccinating young children against the flu appeared to have no impact on flu-related hospitalizations or doctor visits during two recent flu seasons. And no studies have conclusively proven that flu shots prevent flu-related deaths among the elderly, yet this is one of the key groups to which they’re pushed.

Aside from not working, flu shots contain dangerous additives, like mercury-containing thimerosal, formaldehyde, aluminum, phenol and detergents. The idea that nearly every man, woman and child in the United States should voluntarily line up to be injected with this concoction, as the CDC strongly recommends, is illogical, pointless and dangerous.

Getting enough vitamin D will nearly eliminate your risk of getting the flu.

But don’t listen to the RDAs spouted by the public health agencies. They are not nearly enough to keep you healthy. In order to prevent the flu, children need 2,000 IU a day of vitamin D, while adults need 5,000 IU to 10,000 IU.

So even though the American Academy of Pediatrics just announced that they’re doubling the RDA of vitamin D for children to 400 IU, their new guidance still falls absurdly short of what’s needed to keep kids healthy.

If you do come down with a case of the flu this year, vitamin D can also help to eliminate the illness. The dose of vitamin D is 2,000 IU per kilogram of body weight, taken as one dose, every day for three days. If you start this program early on in the illness, it should be able to completely wipe out the flu.

The Best Source of Vitamin D, and What Level You Need to Stay Healthy

Exposing your skin to sunlight is the best way to get vitamin D.

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.

If you’re able to get out in the sun for an adequate time period each day, your vitamin D levels should be naturally optimized.

However most of us struggle with seasonal vitamin D winters in which we may not be able to get enough sun exposure during certain parts of the year. In that case, I also advise using a safe tanning bed (one that has the harmful emissions shielded) to have your own body produce vitamin D naturally.

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.

How do you know if you’re getting the right amount of vitamin D?

You need to have your blood levels tested, but not just any test -- or any lab -- will do. The OPTIMAL level of vitamin D you’re looking for is 50-65 ng/ml.

Though it may seem like a hassle to go out and get a blood test done, then continue to have your vitamin D monitored as you increase your sun exposure or supplementation, I can confidently say that it is one of the most important things you can do for your health.