Study finds vitamin D supplements with or without Omega-3s decreased risk of autoimmune diseases (2022): https://medicalxpress.com/news/2022-01-vitamin-d-supplements...
Researchers find low magnesium levels make vitamin D ineffective (2018): https://medicalxpress.com/news/2018-02-magnesium-vitamin-d-i...
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It would seem that there is a pharma-inspired cabal of users trying hard to suppress the info that vitamin D3 is highly relevant for autoimmune matters. Due to such suppression across the internet, most people with autoimmune issues find out the connection too late if ever.