This includes people with limited skin synthesis of vitamin D, who are not often outdoors, are frail, housebound, living in a care home, or usually wearing clothes that cover up most of the skin, or with dark skin, such as having an African, African-Caribbean or south Asian background.
The British Journal of Nutrition.
A 2016 found that circulating vitamin D status was improved by weight loss, indicating that fat mass may be inversely associated with blood levels of vitamin D.
Following the final converting step in the kidney, calcitriol is released into the circulation.
The American Journal of Clinical Nutrition.
In addition to the kidneys, calcitriol is also synthesized by certain other cells, including - in the.