When choosing a liquid stevia for a keto diet, quality and purity matter most....

https://astro-wiki.win/index.php/Natural_Keto_Sweeteners:_A_Practical_Tutorial_for_Real_Flavor_Without_the_Aftertaste

When choosing a liquid stevia for a keto diet, quality and purity matter most. Not all stevia extracts are created equal—many contain fillers or added sugars that can disrupt ketosis or cause unwanted side effects