Attention-Deficit/Hyperactivity Disorder (ADHD) is a common neurodevelopmental disorder. Gut
microbiome dysbiosis may be associated with the pathophysiology of ADHD. Investigators
previously found the relative abundance of Sutterella stercoricanis were increased and
Bifidobacterium bifidum were decreased in the ADHD group. Investigators hypothesize that ADHD
patients receiving supplementary Bifidobacterium bifidum (Bf-688) is able to increase the
proportion of Bf-688; inhibit the proportion of Sutterella; and improve ADHD symptoms.