oooflavors keto flavor 4 pack - flavored liquid concentrate (keto) one on one flavors flavored liquid concentrate: with over 400 flavors to choose from, one on one flavors take pride in offering the most diverse selection of top quality flavor concentrates! our flavor concentrates are highly concentrated and may be used for multiple purposes! one on one flavors are proudly made with the finest ingredients & manufactured here in the usa. important information: diacetyl free!