I'm by far no expert and I do take a lot of supplements for my neuropathy but I thought I would provide a couple of references that speak to autoimmune conditions and supplements.

"Mar 24, 2022 — Vitamin D supplements really do reduce risk of autoimmune disease (New Scientist) · Taking Vitamin D Daily Can Help Prevent This Disease, New ..."
--- Can vitamin D supplements prevent autoimmune disease?:
https://www.health.harvard.edu/blog/can-vitamin-d-supplements-prevent-autoimmune-disease-202203242712.
--- The effects of immunostimulatory herbal supplements on autoimmune skin diseases:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7736300/.
--- How to Tackle the Relationship between Autoimmune Diseases and Diet: Well Begun Is Half-Done:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8620243/