Established in 1946, O-SO started as an independent soft drink company based in Chicago, IL. By the end of the decade the company had a network of bottlers in nearly every metropolitan market in the country. Originally famous for its O-SO grape flavor, the company added many new flavors and incorporated the lines "O-SO Good" and "O-SO Delicious" into its sales and marketing materials. O-SO butterscotch root beer will not fail you with its rich notes of butter and brown sugar with the added treat of root beer to round out the creaminess.