I don’t have an answer to improving the immune system, but this is an excerpt from the Cleveland Clinic regarding RA’s effect on the immune system ..

But common autoimmune inflammatory diseases can leave your immune system weakened, too. These include rheumatoid arthritis, Crohn’s disease and others.

A diagnosis of RA implies that our immune systems are out-of-whack (hence the category autoimmune disease). We do not want to “boost” an already faulty immune system, as boosting this out-of-whack system will cause damage more quickly. Currently there are no cures/treatments/medications to “fix” a faulty immune system. What we do have, however, are RA meds that suppress our faulty immune systems in order to slow the progression of the disease. [i.e. DMARDS and Biologics]

RE: Tumeric . . . please consult your physician before taking this [or any other supplement recommend online, for that matter] as turmeric is NOT recommended when taken in combination with certain medications.

RA is and autoimmune disease yes it lowers your immune system a lot

It is isn't RA that lowers your immune system, it's the drugs that are used to treat RA. Trying to improve your immune system would not be helpful, and might counter act the drugs you are taking to suppress your immune system.

Plumeria... thank you, that makes perfect sense. I have so many friends who say you got to boost your immune system, you should try this and try that etc. i always figured there was way more to it. Now I have a better explanation.