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Theanine and Caffeine: study protocols

5 study groups took Theanine together with Caffeine. These are the doses the studies gave. They are not a recommendation.

Theanine: what the research found →

Dose per serving from research: Theanine

5 study groups in 5 studies say how much Theanine participants took a day.

These are the doses the studies gave. They are not a recommendation.

Most common: 50 mg to 100 mg, 60% of 5 study groups.

Daily doseStudy groups
50 mg to 100 mg
3
100 mg to 250 mg
2

Dose per serving from research: Caffeine

5 study groups in 5 studies say how much Caffeine participants took a day.

These are the doses the studies gave. They are not a recommendation.

Most common: 25 mg to 50 mg, 40% of 5 study groups.

Daily doseStudy groups
25 mg or less
1
25 mg to 50 mg
2
50 mg to 100 mg
1
100 mg to 250 mg
1

Commonly used together

2 of 5 study groups took Theanine and Caffeine with something else, but nothing that 3 or more different studies gave.

5 study groups

Study
Acute effects of theanine, caffeine and theanine-caffeine combination on attention
2017 · theanine-caffeine combination · Healthy male volunteers
200 mg160 mg1 day20
The combined effects of L-theanine and caffeine on cognitive performance and mood
2008 · 50 mg caffeine plus 100 mg L-theanine · Healthy volunteers
100 mg50 mg1 day—
The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness
2010 · L-theanine and caffeine combination · Young adults; sex and age range not reported
97 mg40 mg1 day—
Matcha Does Not Affect Electroencephalography during Sleep but May Enhance Mental Well-Being: A Randomized Placebo-Controlled Clinical Trial
2024 · matcha group · Healthy Japanese men and women aged 20 years or older who experienced difficulty sleeping
50.3 mg71.5 mg4 weeks—
Cognitive and Mood Effects of a Nutrient Enriched Breakfast Bar in Healthy Adults: A Randomised, Double-Blind, Placebo-Controlled, Parallel Groups Study
2017 · nutrient enriched · Healthy adults aged 21–40 years
125 mg21.5 mg8 weeks48
Theanine and Caffeine: study protocols | supp.fit