Vitamin D supplements face scrutiny over quality and dosage

A recent test by consumer magazine Öko-Test evaluated various Vitamin D products, including tablets, capsules, and drops. Out of four Vitamin D drop products tested, only one received a 'good' rating. The study, which examined 23 total preparations, noted that many supplements contained excessively high daily dosages. The report highlighted a distinction between dietary supplements, which are classified as food and cannot claim medical effects, and medicinal products, which are intended to compensate for existing deficiencies.

There is significant international variation regarding recommended daily intakes for adults aged 19 to 70. The German Nutrition Society (DGE) recommends 800 IU, while the UK's National Health Service (NHS) suggests 400 IU, and the US National Institutes of Health (NIH) recommends 600 IU. The Endocrine Society suggests a higher range of 1,500 to 2,000 IU. Medical experts note that individual requirements vary based on factors such as skin color, age, weight, lifestyle, and genetics, making a universal recommendation difficult.