Mineral
Zinc
An essential mineral involved in neurotransmitter function, immune health, and brain signalling.
KÖGN Health grades Zinc as A (Strong evidence) and rates it 4.2 out of 5.
Last reviewed · June 2026
Primary effects
- Improved cognition
- Mood support
- Brain health
How it works
Supports neurotransmission and brain signalling pathways involved in cognition and mood.
Overview
Zinc is a critical trace mineral involved in hundreds of enzymatic reactions, including those in the brain. It plays a role in neurotransmitter regulation and synaptic function. Deficiency can negatively impact mood, cognition, and immune function, making adequate intake essential for optimal brain performance.
The evidence
Zinc is essential for neurotransmission and brain development, and authorised EU claims cover its role in normal cognitive function. As with the B vitamins, the cognitive payoff is mainly corrective: supplementing helps where intake is low (more common in older adults and vegetarians), while trials in already-replete adults — such as the ZENITH study — show little or no benefit.
How to dose it
Supplements typically provide 15–30 mg/day of elemental zinc. The tolerable upper limit for adults is around 40 mg/day from all sources.
When to take it
Chronic — tracks the correction of low status.
Safety & side effects
Well tolerated at sensible doses; large doses on an empty stomach cause nausea. The main long-term risk is that excess zinc depletes copper, which can itself cause anaemia and nerve problems.
Who should avoid it
Avoid sustained high doses without balancing copper. Zinc reduces absorption of some antibiotics (tetracyclines, quinolones), so separate the doses by a few hours.
References
Related ingredients
Graded entries that target the same cognitive goals.
Categories
Draft — the dose, safety and evidence notes on this entry were prepared from the published literature and are pending editorial and clinical review.
Educational information, not medical advice. The evidence grade is KÖGN’s editorial assessment of published research, not a health claim. Speak to a qualified clinician before changing what you take.