Personally, I have been drinking Aloe Vera juice for years. I usually take a shot (yes, literally a shot - I drink it out of a shot glass) of it before I go to bed so it can work its way through my system while I sleep. After about one month, I started waking up with a flat belly and my skin improved also. Needless to say, I have been very regular. The taste is not the greatest and I've acquired over the years. But if you add a few drops of apple or any other juice not from concentrate, the taste is more bearable. Be careful not to drink too much, aloe vera has powerful properties!
I purchase Lakewood Aloe Vera juice. Lakewood offers great $1 off coupons via the mail. Go to the website via http://www.lakewoodjuices.com/contact and fill out the form. In the comments, request coupons. I received about 10 coupons for $1 off within two weeks. Also, check the juice aisles; Lakewood often places $1 off coupons on the necks of their juices.