The 12-month General Practice Optimising Structured MOnitoring To achieve Improved Clinical Outcomes (GP-OSMOTIC) trial, which compared professional-mode (masked) flash glucose monitoring with usual care (non-insulin glucose-lowering drugs, insulin, or both) in 299 adults with T2D in primary care, reported a significant reduction in mean HbA1c with flash monitoring at 6 months (− 0.5%; P = 0.0001) but not at 12 months (− 0.3%; P = 0.059), although the mean percentage of time spent in target glucose range at 12 months was 7.9% higher with flash monitoring than usual care (P = 0.0060) [15]. Here, INS is linked to type 2 diabetes mellitus.