Study	Reason for exclusion
Bashmakov 2014	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Bhatt 2013	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Bo 2018	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Elliott 2009	Narrative review
Fujitaka 2011	Study participants had metabolic syndrome. Primary investigator for that study was Dipak K Das, who was found to have falsified data and was charged with fraud (https://www.nytimes.com/2012/01/12/science/fraud‐charges‐for‐dipak‐k‐das‐a‐university‐of‐connecticut‐researcher.html)
Goh 2014	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Imamura 2017	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Javid 2017	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Khazaei 2014	Narrative review
Khodabandehloo 2018	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Kjaer 2014	Study participants had metabolic syndrome
Mendez‐Del 2014	Study participants had metabolic syndrome
Movahed 2014	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
NCT00937222	Study intervention was not resveratrol (peanuts and peanut butter intervention)
NCT01038089	Not a randomised controlled trial
NCT01150955	Study participants had metabolic syndrome
NCT01375959	Study participants had impaired glucose tolerance
NCT01714102	Study participants did not have type 2 diabetes mellitus
NCT01997762	Study participants had gestational diabetes
NCT02129595	Study participants did not have type 2 diabetes mellitus
NCT02216552	Study participants did not have type 2 diabetes mellitus
NCT02219906	Study participants had metabolic syndrome
NCT02565979	Study participants had impaired glucose homeostasis
Sattarinezhad 2018	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Seyyedebrahimi 2018	Study participants were not comparable due to a combination of a rather unspecified mixture of oral anti‐diabetic agents with/without resveratrol (not identical in the intervention/comparator groups)
Tomé‐Carneiro 2012	Only 36% to 48% of study participants had type 2 diabetes mellitus