I have always had trouble with my knee, but recently I had such pain, I had to finally see a Doctor. He gave me pain medicine, and I only took one, because I knew I could not continue with that. I found Real Time Pain Relief by accident and ordered samples, and had [quick] relief, I could not believe it. I had tried another brands, but did not like the smell or the real hot feeling. Real Time Pain Relief has a pleasant smell, no hot feeling when applied, and works great...pain gone, and had a good nights sleep last night. Oh, hope my reorder of a bottle arrives before my samples run out. I am thinking of taking a sample to my doctor so he is aware of your product.