Interesting. Don't think it's a placebo effect. I gave it to my wife for her tendonitis, and on day two her mucus (allergy) symptoms disappeared as well. Cheeses normally cause an excess mucus production in her and even after eating a pizza she was totally clear.
I started taking alfalfa for my joints. I noticed that my chronic allergy symptoms disappeared! (I tend to have a runny nose most of the time.) I wasn't trying to fix the allergies so I don't think this was a placebo effect.
I was taking 2 tablets several times a day. Alfalfa is a pretty cheap supplement to take. The pills are a little hard to get down, I will say.