The new season is here and we’re celebrating the BEST way know how - with a new flavor! Introducing KETO//OS NAT® Horchata Clásica. KETO//OS® NAT™Pruvit's Ketone Supplement produces the most bioavailable ketone salts through the first and only naturally fermented process. Now that’s Nutritionally Advanced Technology™. Produces the most bioavailable ketone salts through the first and only naturally fermented process. Now that’s Nutritionally Advanced Technology™.This is NOT a keto diet. This is to Challenge you to drink ketones for 10 days and experience what it feels like to operate on a premium fuel source.