Aloe vera can lower glucose level

[MrAloeVera]

A study done on rats revealed that aloe vera extract reduced blood glucose levels from 256 mg/dl to 130 mg/dl in one week, and to normal thereafter (~100 mg/dl). LINK

Another study done on mice concluded that aloe vera reduced blood glucose up to 54% of controls in 15 days. LINK

There are others, including two human trials from 1996:

1. Antidiabetic Activity Of Aloe Vera L. Juice. I, Clinical Trial In New Cases Of Diabetes Mellitus, Phytomedicine, 1996

Conclusion:
Aloe reduced blood glucose over a 2-week treatment period.

2. Antidiabetic Activity Of Aloe Vera L. Juice II, Clinical Trial In Diabetes Mellitus Patients In Combination With Glibenclamide*, Phytomedicine, 1996

Conclusion
* Glibenclamide-plus-Aloe reduced BG more than glibenclamide-plus-placebo over 42 days.
* Glibenclamide is a sulfonylurea, like glyburide or Diabeta.

Another herb that is well known to reduce blood glucose levels is the Nopal.