Is Huawei's noninvasive blood glucose watch true?

It's true. According to the inquiry of Huawei official website, on May 15, 2023, Yu Chengdong announced at the Weibo that Huawei WATCH4 series will support the risk assessment of hyperglycemia for the first time. The principle of WATCH4 non-invasive blood glucose meter is to use a laser transmitter to emit light with a specific wavelength to subcutaneous tissue fluid, and then return the light to the sensor in a way of indicating the glucose concentration, so as to realize the detection of human blood glucose.