zinc works for both male and female libido. i know my story is just anecdotal, but i am female myself.
lars, zinc is (on average) lower in ms patients than in healthy controls. when we talk about nutrients that affect immune function, we have to consider that our immune system is a complicated arrangement.
in a very simplistic way, some messages say 'attack', and other messages say 'stop attacking'. if the body is low on ingredients that constitute the 'brakes', then one can certainly do well by strengthening that part of the immune system. vitamin d3 improves immune function in just this way. it strengthens the immune system by beefing up the brakes (among other things).
it's a long time ago now, but i've also seen research that indicates ms patients experience a drop in their natural killer cells in advance of a relapse. so you could consider adding a number of things that boost your body's natural killer cell level in hopes of preventing or minimizing the impacts of a relapse. it's a boost to the immune system, but likely a positive one. [update: i have taken echinacea which does exactly that, raise natural killer cells, but whether it was that or one of the other ingredients in the "immu-9" formula, it made me feel kind of non-specifically blah. it has to be a personal evaluation i guess!]
getting back to zinc and ms. we have had a fair amount of discussion here on uric acid levels and ms and relapse. ms patients typically have reduced levels of uric acid, and also on average, lower zinc. it turns out that adequate zinc is needed to maintain levels of uric acid (in rats), so those two phenomena of the ms patient are potentially linked. http://jn.nutrition.org/cgi/content/abstract/105/1/26
uric acid is pretty important to immune support in ms. admittedly the following is just a murine EAE study, but you can find lots more research out there
http://www.pubmedcentral.nih.gov/articl ... tid=138606
inflammation can certainly be altered in both excess zinc and in zinc deficiency states. zinc status has to be balanced and optimized. ms patients who are deficient in zinc should certainly not avoid it for worrying about the inflammatory consequences of excess zinc. better to aim for that sweet middle ground of optimal. it's pretty important to have your bloodwork monitored if you're going to supplement zinc. other options are to boost the intake of zinc-rich foods.
if you check out the thread 'ms, zinc, boys, girls, and controls', you can see the chart which will give you a sweet spot to aim for.