Vitamin D is available in foods such as milk, cheese, fish and eggs. It also comes naturally from the sun.
vit D and calcium
Calcium, vit D and vit K are important in the blood clotting cascade. Calcium and Vit K are cofactors and are directly needed to convert certain proteins into functioning clotting factors. Vit D is needed for Calcium absorption.
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Over 50% of people have a Vitamin D disorder. Vit D disorder is not considered to be a cause of Fibromyalgia. However, increasing your Vit D can improve some of your symptoms.
synthesis of a Vit. D
Males don't actually need a lot of Vit D at the age of 30 - 50. From the age of 65 onwards calcium or Vit D loss begins and one can choose to either take Vit D tablets or lots of dairy products and meat. However females do need Vit D at 40 years, especially if they have had a baby because part of their Vit D or calcium has been passed on to the baby.
Make the bone strong. Sunlight is a very important source of vit D.
Vitamin D is a hormone also.
Yes, there is no problem in taking vitamins (calcium, iron, vit B, vit D, vit C, etc...) while taking Effexor. Even if these are taken at the same time.
Absence of vit d causes rickets in children and osteomalaxia in adult
Rickets is caused by too little Vit D. If you have rickets, go out in the sunshine every day as the body makes its own Vit D when sun shines on bare skin. Vit D is a fat soluble vitamin and because of that it is added in certain brands of margarine. Rickets can't be treated by diet alone. Good quality supplements are needed too. But not too many. This is because, being fat soluble, Vit D is stored in human body fat, and if you have too much, it acts as a poison. The same applies for Vits A D and K as well.
It increases the intestinal absorption of calcium. Low levels of vit. D leads to low calcium stores, increasing the risk of fracture. Excessive doses of vit. D can be toxic for the body. It can raise blood calcium levels that may cause grogginess and constipation.