Fructose is found in many places. People often think of high fructose corn syrup (HFCS) when they think of fructose, however HFCS is more like sucrose (sugar) than fructose. A lesser known source of fructose is crystalline fructose. Pure crystalline fructose consists of only fructose, while sucrose and HFCS contain almost equal amounts of fructose and glucose. The ratio of glucose to fructose in HFCS varies, but is typically around 55% fructose and 45% glucose — about the same percentages found in sucrose or table sugar.