Your body needs Vitamin D. And chances are strong right now that you’re short on it.

You see, between low direct sun exposure (plus, use of sunscreen), poor nutrition in much of the foods that are available, and a number of other environmental factors…

A large percentage of the U.S. population is currently deficient in Vitamin D.1

And I’m not going to sugarcoat it…This is not good.

Vitamin D plays a key role in your immune system’s ability to function properly.2

Vitamin D

Here are some things Vitamin D does:

It’s essential for keeping your bones strong as well. Your body can’t utilize calcium properly without it.3

And it’s also crucial for the health of your gut lining and your friendly gut bacteria.4,5

What all of this this means is, if you want to help your body defend itself against frequent illness, weakening bones, digestive problems, and dangerous leaky gut…

Vitamin D is one of your most powerful allies

And you don’t want this ally to be missing in action. That’s why supplementing Vitamin D is one of the first things I recommend to my patients — and anyone else I give health advice to.

I take it myself every day. So does my wife, Penny. And I strongly encourage you to do the same. I recommend taking 5,000 IU (international units) of Vitamin D3 daily.

Vitamin D3 supplements are widely available…

However you get your hands on Vitamin D3 is not important. What is important is that you start adding it your daily routine as soon as you can.

This nutrient is essential for your health. And nowadays, it’s hard to get enough of it through eating and sunlight alone.

Looking out for you,

Steven Gundry, MD

P.S. If you’re worried about getting too much Vitamin D, that will not happen with 5,000 IU daily. You’re much more likely to get too little if you don’t supplement.


1 Forrest KY, Stuhldreher WL. Prevalence and correlates of vitamin D deficiency in US adults. Nutr Res. Jan 2011; 31 (1): 48-54. DOI: 10.1016/j.nutres.2010.12.001.
2 Cantorna MT, McDaniel K, Bora S, Chen J, James J. Vitamin D, immune regulation, the microbiota, and inflammatory bowel disease. Exp Biol Med. Nov 2014; 239 (11): 1524-30. DOI:10.1177/1535370214523890.
3 Staud R. Vitamin D: more than just affecting calcium and bone. Curr Rheumatol Rep. Oct 2005; 7 (5): 356-64. DOI: 10.1007/s11926-005-0020-0.
4 Assa A, Vong L, Pinnell LJ, Avitzur N, Johnson-Henry KC, Sherman PM. Vitamin D deficiency promotes epithelial barrier dysfunction and intestinal inflammation. J Infect Dis. Oct 15, 2014; 210 (8): 1296-305. DOI: 10.1093/infdis/jiu235.
5 Cantorna et. al. at 1524-30.