Dr. Andrew Weil recently updated his recommendation as to how much supplementary Vitamin D3 an adult should be taking on a daily basis to 2,000 International Units. Dr. Mercola (not a medical doctor) thinks that should be even higher. Probably 5,000 IUs. He notes that a day of summer sun can generate about 20,000 units of Vitamin D, and that that is probably what our bodies are evolutionarily suited for.
The current U.S. RDA of 400 IUs is grossly inadequate for anything other than preventing rickets. Yet Vitamin D has a documented role in preventing many chronic diseases, such as cancer and heart disease, as well as infections. To be protected from those maladies, we need more Vitamin D coursing through our veins.
The only way to know for sure how much supplementary Vitamin D3 one should take is to have a blood test. That combines what you are taking as a supplement with what your body is able to produce naturally from the sun. The farther away from the equator you live, the more Vitamin D3 you will need.
My wife and I have been taking 2,000 IUs of Vitamin D3 for many years. She recently had her blood levels checked and the doctor was pleasantly surprised to find her in the acceptable range (32-56 ng/ml). "No one ever tests out in the acceptable range!" he exclaimed. Guess it helps to read health literature and to act upon science-based recommendations. I encourage you to do the same.
Coaching Inquiries: How much supplementary Vitamin D3 do you take on a daily basis? Where could you go to get your blood checked? What would stop you from taking at least 2,000 IUs of Vitamin D3 right now, with or without the blood test? I encourage you to make the change.
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