welcome to HealthcareMagic
The knee pain
your mother is suffering from is due to age related degenerative changes of the bones and is called Osteoarthritis
.To treat the knee she will have to take calcium supplements;and glucosamine
which will help to control the degeneration of bones and for pain she will have to take painkiller.As for the Amway supplement she can take but it is important to understand that we can just control the further damage and cannot revert the knee back to normal so she may have pain in between for which she has to take pain killer given by her doctor.Before starting any Amway supplement please consult her doctor.