Vitamin D2, 50,000 units, is a fast mover in our pharmacy. This baffles me, because we have known for quite some time that vitamin D3 is a far superior form of vitamin D. The cool thing about D3 is that our bodies can manufacture D3 from cholesterol and exposure to sunlight, specifically, UVB light. I’m not going to go through the hard science here, but I do think it is fascinating and worth your time if you are so inclined. Vitamin D is important for your bones, your muscles, and your mental health!
I’ve been doing a lot of walking lately, getting ready for the Susan G. Komen 3-Day walk. I was about 3 miles into a morning walk when a fellow motioned to me that he wanted to talk to me. I turned off my headset and he proceeded to tell me that this was not the best time of day to get my vitamin D and started talking about “solar noon” which he described as from after 10AM till 2PM. I had taken my shirt off to get some sun and he must have assumed that I was on a mission to get some vitamin D. I do indeed like getting my vitamin D naturally and I also like not looking like a beached white whale when I visit Hawaii or the Caribbean. But, please take note! I try very hard to limit my sun exposure, paying close attention to the length of time and the time of day that I walk around without a shirt on. I’m pretty white. To tan, I must expose myself very gradually to the sun, which works out great for vitamin D production. The usual recommendation is about half the time it takes for the skin to turn pink. For my skin, that’s about 20 to 30 minutes depending on time of day.
Living in Arizona, this whole “solar noon” thing intrigued me. Walking at high noon in Arizona, in August, is just plain crazy. It’s friggin’ hot! I told the guy that the amount of UV radiation reaching us during the day is somewhat of a bell curve so I was still getting my vitamin D even though it wasn’t even 9AM yet. That’s what my logical, scientific mind thought, anyway, and later I decided to see if I could verify that theory. I discovered the WillyWeather website that has the UV index for the Phoenix area, day by day, hour by hour. Lo and behold, it’s a bell curve!
My science served me well in this case, at least as far as the bell curve theory. But am I getting any vitamin D synthesized? Most sources that I checked suggested a balance between exposure and protection. It appears that a UV index around 3 is what will yield good vitamin D synthesis while minimizing the risk of skin damage and the formation of those dangerous radicals that could lead to skin cancer. I am pretty happy to discover all that. During these training walks we often start at 5AM. I will often take my shirt off around 7 to 7:30, if in an appropriate environment, and get covered back up by 9AM. This seemed intuitive to me and I feel more comfortable doing this now that I have done the research. The UV index in the Phoenix area hits 3 between 8AM and 9AM. Again, I trust in that bell curve and feel that even when the index is 2, I am synthesizing some vitamin D. Plus it feels good to have the morning breeze on my skin! We all live under the same sun and as long as we respect its power, we can all benefit from it.
Getting back to those bottles of 50,000 IU vitamin D2 on my shelf.. How long will it take for prescribers to catch up with the science and start ordering D3 for their patients? Both forms are very low cost and well tolerated. For some great guidance and solid information, visit the Vitamin D Council website. I encourage my pharmacist friends to spread the word so that we can get D3 onto that shelf where we have the D2 stacked now. To my physician and other prescriber friends, what are you waiting for?