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Sitat:

A 1985 study reported that steviol, a breakdown product from stevioside and rebaudioside (two of the sweet steviol glycosides in the stevia leaf), is a mutagen in the presence of a liver extract of rats pretreated with a PCB blend — but this finding was criticized on procedural grounds that the data were mishandled in such a way that even distilled water would appear mutagenic. Over the following years, bioassay, cell culture, and animal studies have shown mixed results in terms of toxicology and adverse effects of stevia constituents. While reports emerged that found steviol and stevioside to be weak mutagens, the bulk of studies show an absence of harmful effects. In a 2008 review, 14 of 16 studies cited showed no genotoxic activity for stevioside, 11 of 15 studies showed no genotoxic activity for steviol, and no studies showed genotoxicity for rebaudioside A. No evidence for stevia constituents causing cancer or birth defects has been found.

Other studies have shown stevia to improve insulin sensitivity in rats, and possibly even to promote additional insulin production, helping to reverse diabetes and metabolic syndrome. Preliminary human studies suggest stevia can help reduce hypertension, although another study has shown it to have no effect on hypertension. Indeed, millions of Japanese have been using stevia for over thirty years with no reported or known harmful effects. Similarly, stevia leaves have been used for centuries in South America, spanning multiple generations in ethnomedical tradition as a treatment for Diabetes mellitus type 2.

Sitat Wikipedia. Ikke akkurat verdens mest pålielige kilde, men det står da i alle fall litt om stevia der.