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John Campbell (YouTuber) John Lorimer Campbell is an English YouTuber and retired nurse educator known for his videos about the COVID-19 pandemic. Initially, the videos received praise, but they later diverged into COVID-19 misinformation. [2][3] He has been criticised for suggesting COVID-19 deaths have been over-counted, [4] repeating false ...
Dr Campbell has consistently championed the use of Vitamin D supplements and often appears in his videos with a toy black dog who is positioned alongside a tub of vitamin D. 2A02:C7D:93FD:C800:E475:5215:9B:227E ( talk) 21:57, 19 August 2022 (UTC)
Vitamin D deficiency or hypovitaminosis D is a vitamin D level that is below normal. It most commonly occurs in people when they have inadequate exposure to sunlight, particularly sunlight with adequate ultraviolet B rays (UVB). [1][2][3] Vitamin D deficiency can also be caused by inadequate nutritional intake of vitamin D; disorders that limit vitamin D absorption; and disorders that impair ...
Vitamin D 5. sitocalciferol. (made from 7-dehydrositosterol) Several forms (vitamers) of vitamin D exist, with the two major forms being vitamin D 2 or ergocalciferol, and vitamin D 3 or cholecalciferol. [ 1 ] The term 'vitamin D' refers to either D 2 or D 3, or both, and is known collectively as calciferol.
External links Official website Tim Spector publications indexed by Google Scholar Tim Spector on Twitter "What Role Does our Microbiome Play in a Healthy Diet? – with Tim Spector". YouTube. The Royal Institution. 27 February 2019. "Discussion with Professor Tim Spector". YouTube. Dr. John Campbell. 22 March 2021.
Michael F. Holick (/ ˈhɒlɪk / HOLL-ik; [1] born 1946) is an American adult endocrinologist, specializing in vitamin D, such as the identification of both calcidiol, the major circulating form of vitamin D, and calcitriol, the active form of vitamin D. His work has been the basis for diagnostic tests and therapies for vitamin D-related diseases. He is a professor of medicine at the Boston ...
John Cannell John Jacob Cannell (born June 21, 1948) is an American doctor. An anti-smoking activist, Cannell was featured in the New York Times in the 1980s for turning away smokers from his clinic in West Virginia. Cannell founded a nonprofit group to address perceived problems with educational testing. Cannell has described several hypotheses regarding the health benefits of Vitamin D and ...
Vitamin D is a secosteroid that plays a vital role in calcium and phosphate absorption. Recent studies show several associations between low levels of vitamin D, or hypovitaminosis D, and neuropsychiatric disorders, [ 1] including Alzheimer's disease, autism, epilepsy, multiple sclerosis, Parkinson's disease, and schizophrenia. [ 1][ 2]
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