**FDA Warning on Non-Invasive Glucose Monitoring Devices** The FDA has issued a warning about the use of smartwatches and rings that claim to measure glucose levels without piercing the skin. These devices are not FDA-approved and may provide inaccurate readings. The warning does not apply to smartwatch applications that display glucose levels from an FDA-approved continuous glucose monitor with a sensor implanted under the skin. The concern is specifically about devices sold online or directly from sellers that claim to measure blood sugar without requiring a finger prick or skin piercing. These products, made by various companies and sold under different brand names, have not been evaluated by the FDA for safety and effectiveness. Using these devices could result in false blood glucose measurements, which can have serious consequences if relied upon for medication dosing. The FDA has not authorized any smartwatch or smart ring to measure or estimate blood glucose values independently. The agency is working to prevent the illegal marketing of such unauthorized devices. People experiencing problems with inaccurate blood glucose measurements or adverse events from using these devices are urged to report them to the FDA through its MedWatch program.