On one urine therapy book written by Dr. Ryoichi Nakao and Mrs. Kayodo Komiyama, I read that propolis extract in the urine improves the therapy. Also it takes out the smell and taste of urine. I put one drop in the one I use to rub my face and it really works, I leave it all day and even I've asked if I smell to my family and they don't notice the smell at all.
Also I read that it's great in the urine we use in the enemas