I have seen some atletles that when are on a tren cycle , develops genital warts due to hpv (hpv is a very prevalent infection, but needs a low immune funcion to develop sintoms - warts).
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i read many studies showing anabolics weakens the immune system.....i used to get sick all the time when on...i started using some echinacea with golden seal and it has helped a bunch...vitamin c is another good supplement to throw in there to help keep ya feeling good
If you stay on for too long it does affect your immune system somewhat. I've seen some difference over the years of lowered immune response on occations but it gets back to normal when I lower dosages to about 300mg of test or lower.
In the long run though I would say that steroids does affect the immune system but not as much as people making it out to be and if you just cycle then go off it shouldnt really be of any concern.
And yes, vit C helps a lot if taken daily.
not directly, women have stronger immune systems because of lower test levels. but i think a male with low test levels will be more stressed/depressed and will have lower immune function because of that.