Vitamin D is available in foods such as milk, cheese, fish and eggs. It also comes naturally from the sun.
vit D and calcium
d Because vit C is water soluble whereas vit D is fat soluble.
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.
Absence of vit d causes rickets in children and osteomalaxia in adult
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.
Sunlight. Sunlight helps your body produce Vit D. and Vit D. helps the absorption of Calcium in your body. Living in a cave does not help you get the amount of sunlight necessary to produce the proper amount of Vit D.