In this articleABTDXCMUser wearing Stelo CGM from Dexcom.Courtesy of DexcomDexcom on Monday announced its new over-the-counter continuous glucose monitor Stelo is officially available for purchase in the U.S.Glucose is a type of sugar people receive from food, and it's the body's main source of energy. Continuous glucose monitors, or CGMs, are small sensors that poke through the skin to measure glucose levels in real time. They are typically prescribed to patients with diabetes since they can help alert use ...