i personally make sure i eat fish, and just take about 1.6g per day of fish oil. when i remember :S i couldn't afford 20g per day, that's for sure!
don't believe that hype about 'immune boosters' being bad for ms. it's a blanket statement that doesn't apply to everything, by any means - and zinc is one thing you'd much rather have enough of, than not.
some people suffer relapses when they get a cold, but if you take enough zinc, resistance against common cold is greatly improved. i think that low zinc is the common denominator to both relapses, and cold infections. it's reflected in research showing that uric acid levels are lowest in ms patients during relapse. serum zinc and serum uric acid levels are positively correlated, ie low uric acid in relapse implies low serum zinc in relapse too.
also optimizing your zinc status really helps your vit d3 status and we all know d3's an immune system booster we need. it just happens to boost the immune system's equivalent of 'brakes' so you can see the value in the context of inflammatory/autoimmune situations. zinc's anti-inflammatory, and anti-oxidant as well. and most ms patients have levels in the low end of the normal range, while the healthies are way up in the top end of the curve.
READ ME key info on nutrient targets - www.thisisms.com/ftopict-2489.html
my approach: no meds so far - just nutrient-dense anti-inflammatory whole foods, and supplements where needed
info: www.whfoods.com, www.nutritiondata.com