Well medical Mj as the name suggest is primary used to ease the pain, solving sleep disorder and in some cases can cure cancer.
I had to edit your post. If you get permission from the Administration to post the link. I will gladly add it back it.
For future reference, Sites that sell Mj are not allowed. If its say a light company or seed site people are telling others about, usually are not a major deal unless its plain advertising/Spam.