Oddly enough Herbalife's diet strategy seems to have been centered on aloe vera. if you haven't heard of Herbalife, they were (and possibly still are) a MLM organization. You might have seen one of their bumper stickers "Lose weight now - Ask me how!". I have major reservations around MLM organizations are as 90+% seem to be some kind of scam - and the people getting scammed are part of the 'pyramid'.

Oh, and I'd add berberine and French lilac to the list of herbal medicines that can help with glucose control.