Is it possible to desensitise your immune system to an allergen?

Hello guys,

I have these mushroom tablets that I bought because of the health benefits proven by various studies. I took one tablet (recommended is 6) but after taking it I had tingling in my hands and feet and felt a bit weird. My cheeks got red and a bit swollen and it’s gotten a bit more difficult to breathe but the supplement works, it does exactly what it’s supposed to. Which leads me to the question in the title, with continued use is it possible to make myself not have a reaction to the tablets or should I look for another supplement despite how very beneficial it is for me to take these specific tablets?

 

I asked my doctor about this about a nasal spray he says the allergic reaction would be worse every time you take it, but I’m not sure about these mushroom tablets. I don’t want to end up with anaphylaxis. lol. The thing I think about is would this be safe?