FRESH STEVIA LEAVES
This form of stevia is the herb in its most natural, unrefined state. A leaf picked from a stevia plant and chewed will impart an extremely sweet taste sensation reminiscent of licorice that lasts for quite a while.
For stevia to have a more practical application as a tea or sweetener, the leaves must be dried or put through an extraction process, which makes the sweet taste even more potent.
Just like any other food the purest is always the best no matter what. So the same is said for stevia you can use it but make sure your not using the refined white drug like mixture found after process.
Of course this applies to many other foods and sugar in general, changing this principal will enhance your life and possibly change it.
Don't be afraid of making better choices, you can't find substance at a drive through window. Food that is made with care from the finest ingredients will benefit your body the greatest.