I agree with you about the validity of skin prick allergy tests. Pretty worthless. I have had more success with muscle testing allergies - things I KNOW I am allergic to that just don't show up on skin or blood tests show up with muscle testing. BTW - The Rattlesnake grass worked for me. The cause of my low stomach acidity was a pituitary problem. In addition to the Rattlesnake grass I am on 2 other homeopathics. I saw my AK yesterday and my hydrochloric acid production is now at 95%. It took about 4 months to get it there.