Study	Reason for exclusion
Anonymous 2009	Review of Johnson 2009
Doebel 2005	Overview of articles and trials of nutrients in children with ADHD
Döpfner 2021	Children were not diagnosed with ADHD.
Greeff 2011	Children were not diagnosed with ADHD.
Harding 2003	Not a randomised or quasi‐randomised controlled trial
Johnson 2017	Children were not diagnosed with ADHD.
Joshi 2006	Pre‐post study
Meguid 2016	Case‐control study followed by open‐label interventional phase
NCT01777048	Study terminated.
NCT01778647	Study terminated.
Richardson 2002	The Conners cut‐off score used as an inclusion criterion was not stated.
San Mauro Martin 2019	Not a randomised or quasi‐randomised controlled trial
Tan 2014	Participants were a subgroup with ADHD from a larger randomised controlled trial of supplementation and social skills training in children with disruptive behaviour disorders.
Wilens 2017	Open‐label pilot study of omega‐3 PUFAs in 10 children aged 6 to 17 years with ADHD

ADHD: attention deficit hyperactivity disorder; PUFAs: polyunsaturated fatty acids