On: Vitamin D Insufficiency is Prevalent in Severe Cov...

[piadodjanho]

Not for vitamin D production.

Vitamin D is produced on UVB spectrum [1 Fig. 1] that decreases with the solar azimuth degree [2].

[1] https://www.direct-ms.org/wp-content/uploads/2018/01/Vit-D-s...

[2] https://www.researchgate.net/publication/285056396_Vitamin_D...

[PopePompus → piadodjanho]

Zenith angle, not azimuth.