Stimulant + Antioxidant
Matcha
Also known as: Green Tea Extract
A powdered green tea combining caffeine and L-theanine for balanced energy and focus.
KÖGN Health grades Matcha as A+ (Strong evidence) and rates it 4.3 out of 5.
Last reviewed · June 2026
Primary effects
- Improved focus
- Sustained energy
- Reduced stress
How it works
Combines caffeine and L-theanine to promote sustained, smooth cognitive stimulation.
Overview
Matcha provides a unique combination of caffeine and L-theanine, resulting in a smoother and more sustained form of stimulation compared to coffee. It also contains antioxidants that support long-term brain health. This combination makes it particularly effective for focused work without the jitteriness commonly associated with stimulants. It is widely used as a daily performance enhancer.
The evidence
Matcha is powdered green tea that delivers caffeine alongside L-theanine and the antioxidant EGCG. Small randomised trials show modest gains in attention and psychomotor speed, with the calm-alert profile you'd expect from the caffeine-plus-theanine pairing; effects on mood are inconsistent. It is a pleasant calm-focus drink with light evidence rather than a potent nootropic.
How to dose it
Studies use roughly 2–4 g of matcha powder (one to two servings), providing about 38–70 mg of caffeine plus theanine.
When to take it
Acute — felt within the hour, like other caffeine sources.
Safety & side effects
Well tolerated for most; at higher intake the caffeine can cause jitteriness, a raised heart rate and disturbed sleep.
Who should avoid it
Apply the usual caffeine cautions — pregnancy, anxiety disorders, and arrhythmias — and avoid late in the day. Green-tea catechins can reduce iron absorption and interact with some medications; mind your total daily caffeine.
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.