There are certain nutrients that stimulate immunity. Those are also discouraged for MS patients.

High dose zinc is a major one (RDA level is okay). So is Astragalus herb. There are some studies showing high dose zinc helps with Herpes infections.

This link has a list of other things that stimulate immunity:
http://www.raysahelian.com/immune.html This topic is important for some diabetics who tend to get infections easily and heal slowly.

Those patients with PN who have elevated ANA and other markers should be prudent with nutrients. Some things we need to stay healthy, but high doses of the same may just fuel the immune system.

There was an interesting thing just published that B6 has been shown to reduce risk of cancer of the lung and colon!

Also this thread response by a visiting doctor is recent about folic acid and those with non-conversion to active forms in the body due to genetic failures:
http://neurotalk.psychcentral.com/post663808-20.html

Being too LOW in certain things is not good either.

Essential fatty acids.
B12, folate, B6
low D (but very high D stimulates immunity)
moderate Vit C -- these all help maintain and repair myelin

mitochondrial damage responds to acetyl carnitine, CoQ-10, r-lipoic acid

Every day we see new studies on things... some say have no effect and some say, are showing promise in some area.

So I'd make sure you have had some antibody studies done if this concerns you. You can still take supplements, but just take what YOU need.