Vitamin D is a vitamin found in the body. It exists in an inactive state in the body, but requires the skin to be exposed to sunlight in order to transform the inactive state to active vitamin D. The vitamin is fat-soluble and plays a significant part in the absorption of calcium from the bowels, as well as in how calcium is used in the body, most notably in building bones and teeth.
The Danish Border of Health recommends pregnant women supplement with 10 mikrograms of vitamin D daily throughout the pregnancy to aid the development of especially bones and teeth in the baby. Usually, the infant is given supplemental vitamin D from their 5th week of living.
High levels of vitamin D can lead to elevated levels of calcium i the blood, which again may lead to symptoms like nausea, headache or constipation. High levels of calcium in pregnant women may cause malformations of the fetus' heart. If monstrous amounts of vitamin D is consumed (equivalent of 100 times recommended daily intake), calcium may aggregate to stones in the bladder or kidneys.
- NetDoktor.dk on vitamin D (in danish).
- Askew, G. & Paquette, J. (2007) (in english). Secrets of Supplements (1st ed.). PhyteMedia. pp. 137. ISBN 978-0-9784290-0-3. http://www.phytemedia.com.
- Flytlie, K.T. (2007) (in danish). Vitaminer og mineraler (1st ed.). People'sPress. p. 11, 16, 28+. ISBN 978-87-91293-97-9. http://www.vitamindoktor.com.
- Danish Border of Health on vitamins and supplementation during pregnancy (in Danish).
- Gravid.dk - danish site for pregnancy (in danish).