can taking immune boosting herbs screw up the immune system?

the two herbs that I'm thinking about taking for the next three months are astragalus and cell forte ip-6/inositol. I've currently started the astragalus at 1 tablespoon root powder per day. I'm just wondering if after discontinuation the immune system can get out of whack? I have heard the rule that if you take anything that your body is suppose to make on it's own it will stop making it. I know that when I stopped taking birth control pills my menstrual cycle did not return to even close to normal for well over a year. I don't want to do more harm but I really want to clear up my condition. thanks. Tweet