Cola by citric or other isolated acids. Coca-Cola's recipe is maintained as a corporate trade secret. A variety of different sweeteners may be added to cola, often partly dependent on local agricultural policy. High-fructose corn syrup (HFCS) is predominantly used in the United States and Canada due to the lower cost of government-subsidized corn. In Europe, however, HFCS is subject to production quotas designed to encourage the production of sugar; sugar is thus typically used to sweeten sodas. In addition, stevia or an artificial sweetener may be used; "sugar-free" or "diet" colas typically contain artificial sweeteners only. In the 1940s, Coca-Cola
Double Cola summer of 1960, Double Cola used a Chinese name as "(得寶可樂)", a locally made super king size with much more carbon dioxide for only 40 Hong Kong cents for a 16 fluid ounce (473 ml) bottle which could serve three then-typical beverage cups. In 2010 Diet Double-Cola was reformulated with Splenda to make it taste more like regular Double-Cola. Two years later the Double Cola was given new branding and packaging though the ingredients stayed exactly the same. In 2013 The Double Cola Company expanded its product line outside of that of just soft drinks. Quad Energy was released in