Table 1.
Characteristics of included trials
| Reference | Number of subject | Duration of intervention | Subject (country) | Intervention | Comparison |
|---|---|---|---|---|---|
| Thazhath et al. (2016) | 28 | 5 wk | T2DM on diet control (Australian) | Resveratrol capsules (n=14) | Placebo (n=14) |
| Yang et al. (2017) | 160 | 12 wk | Prediabetes or early untreated diabetes (Chinese) | Purified anthocyanins (n=80) | Placebo (n=80) |
| Zare Javid et al. (2017) | 43 | 4 wk | DM (Iranian) | Resveratrol capsules (n=21) | Placebo (n=22) |
| Khodabandehloo et al. (2018) | 45 | 8 wk | T2DM (Iranian) | Resveratrol capsules (n=25) | Placebo (n=20) |
| Abdollahi et al. (2019) | 71 | 8 wk | T2DM (Iranian) | Resveratrol capsules (n=35) | Placebo (n=36) |
| Mollace et al. (2019) | 60 | 30 d | T2DM (Italian) | Bergamot polyphenolic fraction (n=40) | Placebo (n=20) |
| Stote et al. (2020) | 52 | 8 wk | T2DM (American men) | Freeze-dried blueberries (n=26) | Placebo (n=26) |
| Yang et al. (2021) | 138 | 12 wk | Prediabetes or newly diagnosed diabetes (Chinese) | Anthocyanins capsules from natural bilberry and blackcurrant (n=76) | Placebo (n=62) |
| Nikbakht et al. (2021) | 26 | 4 wk | T2DM, T2DM-at-risk, healthy (Australian) | Anthocyanins capsules from natural bilberry and blackcurrant (n=26) | − |
T2DM, type 2 diabetes mellitus.