Posted on 05/01/2011 6:08:29 PM PDT by decimon
Multiple forms often contend for the same receptors. Supplements can be weird. “take more vitamin D” can be risky for some people.
The fact about that fact is that it's not a fact. The sun must be high in the sky for our skin to make vitamin D. In most of the United States the sun never gets high enough for much of the year.
D6 is listed at the end of page 6, the last page.
You can find it written as 25(OH)vitamin D. Some docs aren't thrilled with its methodology. My guess is a problem with the reproducibility of results.
Thanks.
The D2 and D3 forms are all I’ve seen as dietary supplements. Don’t know where the other Ds would be found or if they are suitable as supplement.
Not surprised. Here in phx I’m sure we’re getting that sun, they aught to do a study to see whether we have kids with anemia much here.
Anemia could have many causes.
Here's something on vitamin D, season and latitude:
"Sun exposure Most people meet their vitamin D needs through exposure to sunlight [5,31]. Ultraviolet (UV) B radiation with a wavelength of 290-315 nanometers penetrates uncovered skin and converts cutaneous 7-dehydrocholesterol to previtamin D3, which in turn becomes vitamin D3 [9,32,33]. Season, geographic latitude, time of day, cloud cover, smog, skin melanin content, and sunscreen are among the factors that affect UV radiation exposure and vitamin D synthesis [33]. The UV energy above 42 degrees north latitude (a line approximately between the northern border of California and Boston) is insufficient for cutaneous vitamin D synthesis from November through February [5]; in far northern latitudes, this reduced intensity lasts for up to 6 months. In the United States, latitudes below 34 degrees north (a line between Los Angeles and Columbia, South Carolina) allow for cutaneous production of vitamin D throughout the year [27]." http://ods.od.nih.gov/factsheets/vitamind.asp
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