I’m surprised the article did not talk about MS.
In multiple sclerosis, immune cells target oligodendrocytes, which are only located in the central nervous system (the brain and spinal cord). Oligodendrocytes are cells which produce myelin.
Very high D3 has reversed or stopped deterioration for some MS sufferers.
https://www.thisisms.com/forum/coimbra-high-dose-vitamin-d-protocol-f57/topic27155-105.html