Pharmacokinetics of Calcifediol and Cholecalciferol

Inclusion Criteria: * Healthy males \>50 years in age * Healthy postmenopausal women \>50 years in age, who have not experienced a menstrual bleeding for a minimum of 12 months * BMI between 20-32 kg/m2 * Subject understands the study procedures and signs the informed consent to participate in the study * Subject has clear understanding of the English language * Caucasian ethnicity * Willingness to avoid direct sun exposure and to restrict travel to sunny climates during the whole study period. Exclusion Criteria: * Subject has any health conditions that would prevent him/her from fulfilling the study requirements, put the subject at risk or would confound the interpretation of the study results as judged by the Principal Investigator * Subjects with a history of hypercalcemia (Serum calcium adjusted for albumin of \> 2.6 nmol/l) * Supplemental calcium intake beyond 500 mg per day during the entire study and follow up * Any vitamin D supplementation within 2 months before the baseline blood draw and during the entire study and follow up * Subject has gastrointestinal malabsorption (from coeliac disease, colitis, surgery etc.) * Subject has kidney disease or liver disease * Medication: Bisphosphonate or Parathyroid Hormone (PTH) treatment, use of steroids in any form, anticonvulsants, antibiotics, antipsychotics, use of any drug that alters fat absorption, e.g. Xenical (Ali). * Use of Hormone Replacement Therapy (HRT) within the previous 6 months * Subject has signs of acute or severe illness (i.e. unintentional weight loss, night sweats etc.) * Subject has a known allergy or sensitivity to the investigational products or any ingredients of the investigational products * Subject heavily consumes alcohol containing products defined as greater than (\>) 3 drinks for men or 2 drinks for women (1 drink is 11 grams of alcohol or equivalence of 12 oz beer, 5 oz wine, or 1.5 oz distilled spirits) of alcoholic beverages per day * Subject has donated more than 300 mL of blood during the last three months prior to screening * Participating in another clinical trial * Women who are premenopausal * Subjects with active current psychiatric illness or condition which is likely to interfere with the subject's ability to understand the requirements of the biomedical research project * Sunbed users will be excluded from the study. * (Expected) increase in exposure to sunlight (e.g. a planned holiday of more than eight days, a beach holiday or a holiday outside Europe) in the study period of day 01 until day 28.