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Prohormone, Vitamin D and Your Sources This Winter

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As winter walks in this year, there will be lesser sunshine hours. This takes up added relevance for the old and those who suffer from osteoporosis and simialr conditions of the bone. Strictly speaking, sunshine itself is not a source of Vitamin D. However, it helps our body (skin in particular) to synthesize Vitamin D.

The epidermal layers of Stratum basale and Stratum Spinosum produce maximum amount of a particular type of a pre-vitamin D3.

Another nomenclature which may be a misfit is, Vitamin. Technically, the chemical of Vitamin D is a prohormone (or a precursor to what makes a hormone or a hormone prototype if you please).

Vitamin D is a fat-soluble vitamin that can be manufactured by the body. Vitamin D is metabolised by the liver and the kidneys and is converted to a hormone called Calcitonin. Calcitrol ensures that there is enough calcium in the blood to help form bones, teeth and maintain bone density. When ultra-violet rays shine on our skin, a cholesterol-like substance gets converted to Vitamin D and absorbed into the blood. Vitamin D is required for the metabolisation of calcium.

A light skinned person requires 15 minutes worth exposure 2-3 times a week and a darker skinned person will require a few hours longer. Vitamin D can be stored by the body. Thus stored Vitamin D from summer can come in handy during the winter months of lesser hours of sunshine. RDA for Vitamin D is fixed at 5 micrograms or mcg for women between 19 and 50 years of age, which translates to 200 IU (International Units).

Some good sources of Prohormone Vit D in the absence of regular hours of sunshine are:
Pure Cod liver oil, Salmon, Mackerel, Tuna fish, Sardines, Milk - nonfat, reduced fat, and whole, vitamin D fortified, Ready-to-eat cereals, Egg, 1 whole ( in egg yolk), Beef liver, Swiss Cheese etc

Mamta Singh is a published author, seasoned business, creative and academic writer. She is a certified fitness instructor, personal trainer & sports nutritionist through IFA, Florida USA. She is the lead writer and holds Expert Author status in many well-received health, fitness and nutrition sites.

Add a Comment3 Comments

Thank you Diane for taking that one:) . Am grateful for it.
@Anonymous: 10000 IUs!! That's how many times above the RDA value? 50? Everything is good in moderation . Over the top pf the best things are bad. It is no wonder that it is cancer-causing.

November 10, 2009 - 11:58am


Tanning beds have been shown to cause damage to the skin and are now among the top cancer risk group. The risk of cancer jumps about 75% when people start using tanning beds before age 30.

Here's an article explaining this:


November 10, 2009 - 9:33am
EmpowHER Guest

A tanning bed that emits UV B is also a source of Vit D. A fifteen minute session will produce as much as 10 000 IU's!

November 10, 2009 - 8:18am
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