Individuals with autism often display symptoms of ADHD. A recent literature analysis of ten studies involving 2,191 subjects and 1,196 cases of ADHD (Wang, Y., Huang L., Qu., and Mu, D., "Iron Status in Attention-Deficit/Hyperactivity Disorder: A Systemic Review and Meta-analysis," PLoS One, 12(1), e0169145, doi: 10.1371/journal.pone.0169145) showed that individuals with ADHD have lower levels of seurm ferritin. Ferritin is a protein inside cells which stores iron and a low level can detect an iron deficiency early on. Although this deserves further study, it may make sense to check a ferritin level when someone has ADHD symptoms and consider iron supplementation which is both safe and inexpensive. *