In a meta-analysis by García-Martínez et al., containing studies performed on patients with T2DM, the Effect Size of resveratrol on glucose was −13.36 mg/dL (p = 0.0007) with a duration < 3 months, on insulin −0.94 mIU/L (p = 0.007), on HbA1c −0.22% (p = 0.02), and on HOMA-IR −0.83 (p = 0.04) [73]. Here, INS is linked to type 2 diabetes mellitus.