there's alot of debate whether or not steroids boost or suppress your immune system. some have said that it does, some say it doesn't. i guess it depends on the individual and how there body handles the particular steroids, also what kind they are taking and how much. deca and primobolan for example have been noted to be beneficial while others such as high dose testosterones have shown to not be. but then again it has also been stated that test does not lower the immune system so who knows