The objective of this study is to assess whether vitamin D supplements are sufficient to increase females who are deficient or borderline deficient in vitamin D levels to normal levels.

Inclusion Criteria:

• Premenopausal Caucasian women, ages 18-47
• Subjects in good health
• Tanning bed group: regular tanning bed user at least once a week for previous 10 weeks

Exclusion Criteria:

• 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