Study	Reason for Exclusion
Abdollahi, et al. BMJ. 2019;9:e026337, doi:10.1136/ bmjopen-2018-026337	It is a protocol
Asghari, et al. Adv Phar Bull. 2018, 8(2), 307–317, doi:10.15171/apb.2018.036	They do not evaluate glycemic parameters
Bo, et al. Acta Diabetol. 2018;55:331–3402018, doi:10.1007/s00592-017-1097-4	They do not report pre- and post-treatment means of glycemic parameters
Brenjian, et al. Am J Reprod Immunol. 2020;83:e13186, doi:10.1111/aji.13186	They do not evaluate glycemic parameters
Cao, et al. Exp Ther Med. 2018; 15: 576–584, doi:10.3892/etm.2017.5400	They do not evaluate glycemic parameters
Crandall, et al. J Gerontol A Biol Sci Med Sci. 2012;67:1307–1312, doi:10.1093/gerona/glr235	It is a pilot study
Foroghi, et al. IJEM. 2018;20:169-176.	Language other than English
Gospin, et al. J Investig Med 2016;64:800–825, doi:1 0.1136/jim-2016-000080.35	Only abstract available
Huhn, et al. 2018. NeuroImage Doi:10.1016/j.neuroimage.2018.03.023	They use a combination of resveratrol with quercetin
Kjaer, et al. The Prostate. 2015;75:1255–1263, doi:10.1002/pros.23006	They do not evaluate glycemic parameters
Knop, et al. Diabet Med. 2013;61:1886 Doi:10.1111/dme.12231	They do not evaluate glycemic parameters
Köbe, et al. Front. Neurosci. 2017. 11:105. Doi:10.3389/fnins.2017.00105	They use a combination of resveratrol with quercetin
Konings, et al. Int J Obes. 2014;38:470–473. Doi:10.1038/ijo.2013.155	They do not evaluate glycemic parameters
Korsholm, et al. Int. J. Mol. Sci. 2017, 18, 554; doi:10.3390/ijms18030554	They do not evaluate glycemic parameters
Maginley, et al. J Investig Med. 2019;67:793, doi:10.1136/jim-2019-001036.20	Only abstract available
Mahmood, et al. J. Pharm Sci Res. 2018;10(5):999–1005.	They do not evaluate glycemic parameters
Milton-Laskibar, et al. IUBMB. 2016, doi:10.1002/biof.1347	Study carried out on animals
Most et al. Am J Clin Nutr 2016;104:215–27, doi:10.3945/ajcn.115.122937	They use a combination of resveratrol with epigallocatechin
Ornstrup, et al. J Clin Endocrinol Metab. 2014;99:4720–4729, doi:10.1210/jc.2014-2799	They do not evaluate glycemic parameters
Pankaj, et al. Biochem Bioph Res Co. 2015. 10.1016/j.bbrc.2015.10.126	Study carried out on animals
Poulsen, et al. Diabetes Obes Metab. 2018;20:2504–2509, doi:10.1111/dom.13409	They do not report pre- and post-treatment means of glycemic parameters
Theodotou, et al. Exp Ther Med. 2018; 18: 559–565, doi:10.3892/etm.2019.7607	The comparison group is not a placebo
Van der Made, et al. Nutrients. 2017;9,596, doi:10.3390/nu9060596	They do not evaluate glycemic parameters
Vatavuk-Serrati, et al. Rev Soc Cardiol Estado de São Paulo-Supl-2019;29(1):88–93	Language other than English
Voduc, et al. Appl. Physiol. Nutr. Metab. 2014. 39:1183–1188. Doi.org/10.1139/apnm-2013-0547	It is a pilot study
Walker, et al. J Clin Transl Res. 2019;4:122–135. Doi:10.18053/jctres.04.201802.004	It is a pilot study
Wicklow, et al. Biochem Cell Biol. 2015; 93: 1–9, doi:/10.1139/bcb-2014-01362015	It is a protocol
Witte, et al. J Neurosci. 2014. 4(23):7862–7870, doi:10.1523/JNEURISCI.0385-14.2014	They use a combination of resveratrol with quercetin
Wong, et al. Nutr Metabol Cardiovasc Dis. 2016, doi:10.1016/j.numecd.2016.03.003	They use a single dose of RV
Wong, et al. Nutrients. 2016, 8, 425, doi:10.3390/nu8070425	They use a single dose of RV