You don’t have to take my word for it; you can read the peer-reviewed literature and understand that you are a mammal, that your immune system works just all mammals mentioned in those peer-reviewed studies. It’s not possible that it wouldn’t be working for you.
However, sometimes people walk in the door with “their own fire” and want it extinguished immediately. Well, I’m not that kind of magician. Like one of my Japanese customers told me a long time ago, “If you want that type of guarantee, it wouldn’t be $69.95.”