My knees were so sore, somedays I had a hard time just going down the stairs. Within weeks of taking Deep Marine Collagen I felt a difference. I have no more joint pain and can even workout without suffering painful joints afterwards. The improvements to my skin and hair are also a nice bonus. I will not go a day without this product, it mixes well in my morning coffee and is tasteless. I highly recommend this product, and I like that it is 100% Canadian made.