Making Vitamin D while the sun shines
Wednesday, 18 November 2015 | Stuart
By far the most effective way of getting enough vitamin D is through skin exposure to the UVB rays from the sun, which react with 7-hydroxycholesterol in the skin to produce cholecalciferol, or vitamin D3.
The same UVB rays degrade any excess vitamin D3 produced to avoid overdosing, and it is interesting to note that the body’s own maximum allowance is around 20,000iu. This is 100 times the current RDA (200iu) and 10 times the amount that researchers are now calling for, and it seems we can surpass these levels with only a few minutes of daily exposure to the sun.
We then convert vitamin D to various forms (also referred to as vitamin D), described in more detail later in this newsletter, and we are now also able to measure the blood serum form to assess deficiency. Two recent British surveys have shown that we are barely producing the 50nmol/L considered by many to be necessary for basic health, and those on low incomes may only be measuring on average 43- 46.5nmol/L of blood serum vitamin D5.
We have a number of articles about different aspects of Vitamin D and the vital roll it plays. Click of any link below to look at that subject or, below the links, click to bring up a printable PDF document covering all of the subjects by the excellent Nutrigold company, which also incorporates references.