God sent! A miracle in a bottle. It's either this or steroid injections. The chronic pain in my knees are so debilitating. This helps me to function. It lasts long. Easy to use. I'm familiar with it have used the rub in the past so I know it works. The mentol smell is strong at first but it does wear off. Thank you Biofreeze. Thank you Groupon. I hope to order this in bulk. I highly recommend it.