Table 2.
AMSTAR 2 rating of included reviews.
| Nutrient Supplement | Reference | Critical Flaws a | AMSTAR 2 Rating b |
|---|---|---|---|
| Vitamin C | Mason, et al. 2021 [43] | 7 | Low |
| Chromium | Zhao, et al. 2021 [40] | 2, 7, 15 | Critically low |
| Probiotics | Cao, et al. 2021 [38] | 2, 7, 13 | Critically low |
| Zinc | Wang, et al. 2019 [42] | 7, 9, 11 | Critically low |
| Magnesium | Verma, H., Garg, R. [39] | 2 | Low |
| Polyphenols | Jeyaraman, et al. 2020 [32] | None | High |
| Raimundo, et al. 2020 [33] | 7 | Low | |
| PUFAs | Gao, et al. 2020 [35] | 7, 11, 13 | Critically low |
| O’Mahoney, et al. 2018 [36] | 7 | Low | |
| Ebada, et al. 2019 [34] | 7 | Low | |
| Vitamin D | Hu, et al. 2019 [37] | 4, 7, 9, 11, 13 | Critically low |
| Folate | Lind, et al. 2019 [41] | 7 | Low |
a Refers to the item numbers of the AMSTAR 2 critical domains that the review has failed to satisfy. b Refers to the AMSTAR 2 rating of overall confidence in the results of the review: High, Moderate, Low, Critically low.