My son and I have both used BIOFREEZE for almost a year for aches and pains, we also get it at the local pharmacy for $8-$9. I love it because the scent doesn't linger too long so I can put it on while I'm at work. I'm wondering if Jeff should try it on his knee. He has RSD in the foot/ankle of the same leg but his knee pain is not due to the RSD. I'm just concerned his leg may be to sensative. Has anyone with RSD ever used this?