The stevia we use is an extract of the stevia plant, standardized to contain at least 98% Rebaudioside A and there are no fillers or excipients mixed with it. This specific extract is researched and approved in the European Union for nutraceutical and food use. We've never heard from anyone getting any unwanted feelings from consuming our products because of the stevia. We also use only less than 0.1% of the stevia in the products where it is contained.
Note also that we have several products without any stevia (Chaga Elixir, Reishi Elixr, Hot Cacao with Cordyceps, all Mushroom Coffees, Mushroom Matcha and our Mushroom Blends).