A couple quick points:
- A Vermont physician, Dr. Andrew Soloman, recommends that his patients take between 2000 and 4000 IUs (International Units) of Vitamin D daily. Seeing that makes me very happy, the Institute of Medicine in the US only recommends adults taking 600 IUs of Vitamin D daily, and many doctors (including my own) say that is nowhere near enough Vitamin D to maintain healthy levels in the bloodstream. I personally take 5000 IUs of Vitamin D3 daily, and the brand I use is Ortho Molecular, which is made in 5000 IU capsules. In the winter (mid November to early March) I take 10000 IUs daily. Dr. Carr's optimal range of Vitamin D levels is 70-100 ng/ml, and I am generally happy if I can get my levels to about 70.
- The article briefly discusses how the use of sunscreen can affect Vitamin D levels. This is something you need to discuss with your doctor, but I will tell you that I don't use sunscreen, and I know it has helped to keep my Vitamin D levels healthy. I have never had a problem with skin cancer and I don't burn (even in NC summers when I am in the outdoor pool for about 40 minutes 4-6 days per week).