Pregnancy and lactation

Subjects with liver disease, renal disease, multiple myeloma, parathyroid disease, irritable bowel disease, celiac disease, cystic fibrosis and pancreatic disease

Subjects with hypocholesterolemia and primary hyperparathyroidism

Subjects taking the following medications:

* Steroids

* Orlistat

* Lipid lowering medication: cholestyramine, statins

* Antiepileptic drugs: phenobarbital and phenytoin

* Currently on vitamin D supplements or using any medication contain vitamin D i.e. cod liver oil, topical calcipotriol or history of use within 1 month

* Rifampicin, isoniazid

* Ketoconazole

Subjects currently on UV therapy

Comparison of 25-hydroxy Vitamin D Level in Caucasian Women Receiving Vitamin D Supplementation and Not Receiving Supplementation: a Randomized Controlled Trial.

What this study is about