Do you recommend Vitamin D and omega 3 fatty acid supplementation for prevention of autoimmune disease?

A resounding "Yes!" but with caveats. I do not recommend them independently but as part of a list of recommendations (listed below).

There is mounting data that many autoimmune disorders (especially systemic lupus erythematosus, SLE, and rheumatoid arthritis) probably occur due to environmental (exte...

I routinely check vitamin D serum levels, and if insufficient (<30) or deficient (<20), I recommend vitamin D3 oral supplementation. Vitamin D3 is animal-based from eggs, liver, etc., while vitamin D2 is plant-based from mushrooms, yeast, etc. So I favor vitamin D3 oral supplementation. There are hu...