You don’t have to take our word for it; you can read the peer-reviewed literature and understand that you are a mammal, that your immune system works just as 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 “on fire” and want to be extinguished immediately. Well, we're not magicians. 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.”