The key point is that it is an immune suppressive steroid that builds up in your blood stream. For those with hay fever, you all know how great you feel after you take your Benadryl. Anything to stop the immune system from doing its job..right! Those without can take 3g of Niacin and have Benadryl handy, you will within minutes understand what I am talking about.. :)
Not sure what you don't get here?
Benadryl is also an immune suppressor.