"Oolong tea may be an effective adjunct to oral hypoglycemic agents in the treatment of type 2 diabetes"

"Oolong tea is effective in lowering the plasma glucose levels of subjects who have type 2 diabetes and who take oral amihyperglycemic agents. Oolong tea, in conjunction with antihyperglycemic agents, was more effective in lowering plasma glucose than were the drugs alone."

Diabetes Care, June 2003