Comparison 1. Resveratrol versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 HbA1c [%]	2		Mean Difference (Fixed, 95% CI)	0.11 [‐0.02, 0.24]
2 FBG [mg/dL]	2		Mean Difference (Fixed, 95% CI)	2.41 [‐2.10, 6.92]
3 Insulin sensitivity (measured by HOMA‐IR)	2		Mean Difference (Fixed, 95% CI)	‐0.35 [‐0.99, 0.28]