joint health supplements

My sister is a runner athlete when she was in high school and when she went to college; she was in a swimming field. As the time goes by, she can feel joint problems especially on the knee part. As far as I can remember, she applied a herbal medication but it didn’t work until it gets worst. Then one day, she found a very effective joint health supplements. If no one told her about this supplement, I’m sure her condition get worst.