The Modern Neurochemistry of ADHD: Working With Your Brain

If you have ADHD, you have probably been told that your brain just does not have enough dopamine. While that is a helpful starting point, it is a bit like saying a car does not work because it has no petrol. In reality, the ADHD brain is far more complex and interesting than that.

Based on research from 2025 and 2026, we are moving away from the idea of a simple "shortage." Instead, we are looking at how different chemicals work together to help us focus, rest, and feel motivated.

1. The Classical Duo: Dopamine and Norepinephrine

We still focus on these two main characters, but our understanding of them has evolved.

• Dopamine: Rather than just being "low," dopamine is often dysregulated. This affects how we process rewards. It is why you might find it impossible to start a "boring" task but can hyper-focus on something exciting for hours (ADDA, 2026).

• Norepinephrine: This chemical helps the prefrontal cortex keep information active. When this is out of balance, it can feel like your "mental notepad" is constantly being wiped clean (ADDA, 2026).

• The "Tuning" Effect: Think of these chemicals as a tuning system. When they are balanced, your brain can easily distinguish between important information and background noise. When they are out of sync, everything feels equally loud and urgent (Varrasi et al., 2025).

  
  

2. The Brain's "Brakes" and "Accelerator"

A major focus of research in 2025 is the balance between two other chemicals called Glutamate and GABA.

• Glutamate (The Accelerator): Recent studies show that people with ADHD often have higher levels of glutamate. This can lead to "cortical hyperexcitability," which is that feeling of having a motor in your head that won't stop running (Aniracetam et al., 2025).

• GABA (The Brakes): GABA is the chemical that helps the brain slow down and filter out distractions. In many ADHD brains, the GABA system is not as strong as it needs to be. This makes it much harder to ignore the bird outside the window or the humming of the fridge

  (Aniracetam et al., 2025).

  
  

3. The Internal Rhythm

New research suggests that ADHD is not a static state. Instead, it is a struggle for the brain to coordinate its internal rhythm. Many of us experience "bimodal" energy levels. This means you might feel foggy and under-stimulated in the morning, followed by a surge of "hyper-arousal vitality" late at night (Chen et al., 2026). Understanding this can help us stop fighting our natural rhythms and start working with them.

4. Fuel for the Brain

We are also seeing more evidence that what we eat supports these neurotransmitters. Modern data suggests that specific nutrients like Omega-3, Zinc, and Magnesium act as essential helpers for these chemicals. When these levels are low, it can make ADHD symptoms feel even more intense. In fact, research has found that lower levels of magnesium are often linked to more severe symptoms (Hunter et al., 2025).

5. Movement as a Precision Tool

While we know exercise helps, a major clinical question has been: which type of movement is best for which symptom? New analysis involving over 1,700 participants offers a clear roadmap (Li et al., 2023).

• To improve focus and memory: Try "Open-Skill" activities like martial arts, team sports, or dancing. Because these require you to make constant decisions, develop the inhibition system (i.e. learn to pause) and adapt to a changing environment, they strengthen the brain's executive functions.

• To reduce restlessness and hyperactivity: Try "Closed-Skill" activities like running or swimming. The rhythmic, repetitive nature of these aerobic exercises is highly effective at calming baseline hyperactivity, acting almost like a natural stimulant for the brain (Li et al., 2023).

Researchers also found that when adults with ADHD took part in a structured 12-week programme combining strength and endurance training, they saw a significant reduction in their symptoms. With an impressive effect size of 0.93, this mixed approach was particularly helpful for improving "goal-directed behaviour." This suggests that lifting weights and building strength may help train the brain to follow through on tasks and manage the day-to-day challenges of ADHD more effectively (Axelsson Svedell et al., 2025).

References

ADDA. (2026). Inside the ADHD brain: Structure, function, and chemistry. Attention Deficit Disorder Association. Updated April 23, 2026.

Axelsson Svedell, L., Arvidsson Lindvall, M., Lidström Holmqvist, K., Cao, Y., & Msghina, M. (2025). Physical exercise as add-on treatment in adults with ADHD – the START study: A randomized controlled trial. Frontiers in Psychiatry, 16, Article 1690216. https://doi.org/10.3389/fpsyt.2025.1690216

Aniracetam, X., et al. (2025). Aniracetam restores the excitation-inhibition balance of neurotransmitters in the prefrontal cortex of mice with ADHD. PMC, Article PMC12932677. https://pmc.ncbi.nlm.nih.gov/articles/PMC12932677/

Chen, D., Zhao, Z., & Chen, W. (2026). Hyper-arousal vitality and its repair for attention deficit hyperactivity disorder. Frontiers in Psychiatry, 16, Article 1611535. https://doi.org/10.3389/fpsyt.2025.1611535

Hunter, C., Smith, C., Davies, E., Dyall, S. C., & Gow, R. V. (2025). A closer look at the role of nutrition in children and adults with ADHD and neurodivergence. Frontiers in Nutrition, 12, Article 1586925. https://doi.org/10.3389/fnut.2025.1586925

Li, L., Yu, Q., Zhao, W., Herold, F., Cheval, B., Kong, Z., & Zou, L. (2023). Physical activity interventions for children and adolescents with attention-deficit/hyperactivity disorder: A network meta-analysis of randomized controlled trials. Frontiers in Public Health, 11, Article 1133727. https://doi.org/10.3389/fpubh.2023.1133727

Varrasi, S., et al. (2025). Attention-Deficit Hyperactivity Disorder (ADHD): A comprehensive overview of the mechanistic insights from human studies to animal models. Cells, 14(17), 1367. https://doi.org/10.3390/cells14171367