immune system and depression

hi;

im depressed about 5 years and 1 week ago i began boost my immune system but i didn't received any result yet; im eating foot that is C vitamine and boosting imunure system;

now i think , if my depression decrease blood pressure then can't i boost my immune system at the depression ?

my foot colds quickly and then body;

I'm sorry, I can't really understand what you're saying. Are you taking vitamin C supplements to try and boost your immune system? Depression on its own shouldn't stop vitamins from working, if that's what you're asking