Tim Spector warns against daily supplement use this winter

In the UK, concerns have been raised regarding the daily intake of vitamin D supplements, particularly during the autumn and winter months when sunlight exposure is limited. The NHS recommends a daily intake of 10 micrograms (400 IU) for most individuals, especially those with little sunlight exposure. However, recent studies have indicated that excessive consumption of vitamin D can lead to serious health issues, including increased risks of fractures and falls. Professor Tim Spector highlighted that high doses of vitamin D, whether through injections or supplements, have been linked to adverse outcomes in several trials. Notably, a 2010 study found that taking 500,000 IU of vitamin D3 daily significantly raised the risk of falls and fractures compared to a placebo group. The NHS warns against exceeding 100 micrograms (4,000 IU) daily, as prolonged high intake can result in hypercalcaemia, which can weaken bones and damage vital organs such as the kidneys and heart. This situation underscores the importance of adhering to recommended dosages and being cautious with vitamin D supplementation, especially during the darker months of the year.