What is it? Overview Usage Side Effects and Warnings

What is Stevia?

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This member of the Aster family has a long history of native use in Paraguay as a sweetener for teas and foods. It contains a substance known as stevioside that is 100 to 300 times sweeter than sugar, but provides no calories. 1 In the early 1970s, a consortium of Japanese food manufacturers developed stevia extracts for use as a zero-calorie sugar substitute. Subsequently, stevia extracts became a common ingredient in Asian soft drinks, desserts, chewing gum, and many other food products. Extensive Japanese research has found stevia to be extremely safe. However, there have not been enough US studies for the FDA to approve stevia as a sugar substitute. Without identifying it as such, stevia is nonetheless widely used by savvy manufacturers to sweeten commercial beverage teas and...

Stevia is primarily useful as a sweetening agent. In addition, two double-blind studies suggest that it may also offer potential benefits for hypertension . 2 Very weak evidence hints at potential benefits in diabetes . 3

Safety Issues

Animal tests and the extensive Japanese experience with stevia suggest that this is a safe herb. 4 Based primarily on the apparently incorrect belief that stevia has been used traditionally to prevent pregnancy, 5 some researchers have expressed concern that stevia might have an antifertility effect in men or women. However, evidence from most (though not all) animal studies suggests that this is not a concern at normal doses. 6 7 The two studies described above in which use of very high dosages of a stevia extract led to reductions in blood pressure raise at least theoretical concerns about stevia's safety. In theory, the herb could excessively reduce blood pressure in some people. Furthermore, if stevia can reduce blood pressure, that means that it is, in...