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https://www.nutraingredients.com/Ar...d-Covid-19-open-letter-to-world-s-governments
[tl;dr[] : Change suggestions of Vitamin D supplementation in the UK - higher - the health officialdom just came down hard against Vitamin D supplementation increases of any kind.
[/tl;dr]
Interestingly, local governments in the NW US, where cloudy days dominate, suggest 2000 IU of Vitamin D daily during winter months. Portland is an example.
This open letter seems aimed more at the UK than elsewhere. At issue is the stuff we all encountered in med school 50 years ago: Hydroxy Vitamin ##D_{3}## supplementation is dangerous.
The dominant view is why Vitamin D RDA's are very low relative to what humans normally get from sunlight -- assuming you see the sun. The US RDA is 400 IU - 800 IU depending on age. One moderate exposure to full sunlight (April - September in the Northern Hemisphere ) for 30 minutes can produce ~20000 IU. Why? Your body makes its own Vitamin D from sunlight. And stores it in adipose tissue if you do not need it. Modern lifestyles limit outdoor exposure, so do climate and seasons.
The letter claims that previous supplementation ( especially in low sunlight populations , sounds like the UK to me) has positive outcomes on Covid-19 infection rates and disease progression.
[tl;dr[] : Change suggestions of Vitamin D supplementation in the UK - higher - the health officialdom just came down hard against Vitamin D supplementation increases of any kind.
[/tl;dr]
Interestingly, local governments in the NW US, where cloudy days dominate, suggest 2000 IU of Vitamin D daily during winter months. Portland is an example.
This open letter seems aimed more at the UK than elsewhere. At issue is the stuff we all encountered in med school 50 years ago: Hydroxy Vitamin ##D_{3}## supplementation is dangerous.
The dominant view is why Vitamin D RDA's are very low relative to what humans normally get from sunlight -- assuming you see the sun. The US RDA is 400 IU - 800 IU depending on age. One moderate exposure to full sunlight (April - September in the Northern Hemisphere ) for 30 minutes can produce ~20000 IU. Why? Your body makes its own Vitamin D from sunlight. And stores it in adipose tissue if you do not need it. Modern lifestyles limit outdoor exposure, so do climate and seasons.
The letter claims that previous supplementation ( especially in low sunlight populations , sounds like the UK to me) has positive outcomes on Covid-19 infection rates and disease progression.