Stevia Leaf Extract 
Botanical source: Stevia rebaudiana (Bertoni) Hemsl 
Specification: Stevia 90 %( Total content>90%: ST>55% R-A>20-25%) 
Stevia 95 %( Total content >95%: ST>60% R-A> 25%) 
Stevia Reb-A 40%, Stevia Reb-A 60%, Stevia Reb-A 80% Stevia Reb-A 95%, Stevia Reb-A97%, Stevia Reb-A98% 
Stevia ST80% (Total content>90%: ST80% R-A8%, R-C ≤ 2%) 
Stevia ST90% (Total content>95%: ST90% R-A5% RC ≤ 1% ) 

Function: Stevia is an all natural sweetener that is gaining massive interest right now. It is derived from a leaf plant native to South America. Studies have shown that it's sweetening properties result from the Stevia leaves containing 2 glycoside molecules known as steioside and rebaudioside. These are 300 times sweeter than table sugar and it's this part of the Stevia leaf that is extracted to form Ultra Stevia Extract which is effectively a purer, sweeter form of the Stevia leaf. 
Because Stevia contains zero calories, zero carbohydrates and has a zero glycaemic index it was previously recommended by experts to those suffering from diabetes as an effective way to sweeten food without affecting blood sugar levels. But it's now these same properties that make it the ideal sweetener to use in sports nutrition. This is because for those concerned with keeping their body fat levels low, Stevia has absolutely no effect on blood sugar levels so adding it to your shake will not cause sugar cravings and will ensure the environment within the body is still conducive to burning fat. Stevia Extract has also been shown to have other health benefits too. Plus, unlike natural sugar, it does not cause tooth decay, increase blood pressure and it also assists with digestion