Which supplement is known to be beneficial for ADHD management?

Iron is known to be beneficial for the management of ADHD, as research has indicated that lower levels of iron can be associated with an increase in ADHD symptoms. Studies have shown that children with ADHD frequently have lower serum ferritin levels, which indicates a deficiency in iron stores. Iron plays a crucial role in the synthesis of neurotransmitters, including dopamine, which is important for attention and cognitive function. Adequate iron levels are necessary for optimal brain development and functioning, which can help improve attention span and behavior in individuals with ADHD.

In terms of the other options, while Vitamin C, Selenium, and Calcium are important nutrients, they have not been as significantly linked to the management or treatment of ADHD symptoms in the same way that iron has.