This study found that micronutrients were more effective than placebo at improving symptoms of ADHD on clinician report, but not on parent report. Despite interest in more holistic approaches to ADHD management, there does not appear to be sufficient evidence to recommend micronutrient therapy at this stage.

Johnstone, J. M., Hatsu, I., Tost, G., Srikanth, P., Eiterman, L. P., Bruton, A. M., … & Arnold, L. E. (2022). Micronutrients for attention-deficit/hyperactivity disorder in youths: A placebo-controlled randomized clinical trial. Journal of the American Academy of Child & Adolescent Psychiatry, 61(5), 647-661.

https://www.jaacap.org/article/S0890-8567(21)00473-1/fulltext?dgcid=raven_jbs_etoc_email