Interesting...in the UK, the NHS (National Health Service) recommendation is for adults to take a 10mcg (micrograms) vitamin D supplement daily (10mcg = 400IU).

Interesting...in the UK, the NHS (National Health Service) recommendation is for adults to take a 10mcg (micrograms) vitamin D supplement daily (10mcg = 400IU). This advice was issued in 2016 after a science advisory body (Scientific Advisory Committee on Nutrition) published a 300 page report of the evidence on vitamin D and health. [1][2] The NHS also say more recently in response to the lockdown [3]: Consider taking 10 micrograms of vitamin D a day to keep your bones and muscles healthy. This is because you may not be getting enough vitamin D from sunlight if you’re indoors most of the day. There have been some news reports about vitamin D reducing the risk of coronavirus. However, there is no evidence that this is the case. Do not buy more vitamin D than you need. They also warn: Taking too many vitamin D supplements over a long period of time can cause too much calcium to build up in the body (hypercalcaemia). This can weaken the bones and damage the kidneys and the heart. If you choose to take vitamin D supplements, 10 micrograms a day will be enough for most people. Do not take more than 100 micrograms of vitamin D a day as it could be harmful. This applies to adults, including pregnant and breastfeeding women and the elderly, and children aged 11 to 17 years. [1] Vitamin D and Health [PDF] https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/537616/SACN_Vitamin_D_and_Health_report.pdf https://www.gov.uk/government/uploads/system/uploads/attachm... [2] The new guidelines on vitamin D – what you need to know: https://www.nhs.uk/news/food-and-diet/the-new-guidelines-on-vitamin-d-what-you-need-to-know/ https://www.nhs.uk/news/food-and-diet/the-new-guidelines-on-... [3] Vitamin D: https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/ https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-...