Green Tea Extract and Caffeine: study protocols
10 study groups took Green Tea Extract together with Caffeine. These are the doses the studies gave. They are not a recommendation.
Dose per serving from research: Green Tea Extract
10 study groups in 6 studies say how much Green Tea Extract participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 250 mg to 500 mg, 30% of 10 study groups.
| Daily dose | Study groups |
|---|---|
| 25 mg to 50 mg | 1 |
| 50 mg to 100 mg | 1 |
| 100 mg to 250 mg | 1 |
| 250 mg to 500 mg | 3 |
| 500 mg to 1 g | 2 |
| 1 g to 2.5 g | 2 |
Dose per serving from research: Caffeine
10 study groups in 6 studies say how much Caffeine participants took a day.
These are the doses the studies gave. They are not a recommendation.
Most common: 100 mg to 250 mg, 60% of 10 study groups.
| Daily dose | Study groups |
|---|---|
| 25 mg or less | 1 |
| 25 mg to 50 mg | 1 |
| 50 mg to 100 mg | 1 |
| 100 mg to 250 mg | 6 |
| 250 mg to 500 mg | 0 |
| over 500 mg | 1 |
Commonly used together
3 of 10 study groups took Green Tea Extract and Caffeine with something else, but nothing that 3 or more different studies gave.
10 study groups
| Study | ||||
|---|---|---|---|---|
| Effects of catechin enriched green tea on body composition 2010 · one serving of control drink and one serving of extra high-catechin GT1 · Moderately overweight Chinese subjects; age and sex not specified | 458 mg | 104 mg | 90 days | — |
| Effects of catechin enriched green tea on body composition 2010 · two servings of high-catechin GT2 · Moderately overweight Chinese subjects; age and sex not specified | 468 mg | 126 mg | 90 days | — |
| Tea catechin and caffeine activate brown adipose tissue and increase cold-induced thermogenic capacity in humans 2017 · single-ingestion catechin beverage (acute trial) · Healthy men; age range not reported; assessed for brown adipose tissue activity | 615 mg | 77 mg | 1 day | 15 |
| Tea catechin and caffeine activate brown adipose tissue and increase cold-induced thermogenic capacity in humans 2017 · catechin beverage twice daily (chronic trial) · Men with low brown adipose tissue activity; age range not reported | 1.23 g | 154 mg | 5 weeks | 10 |
| Effects of catechin enriched green tea on body composition 2010 · two servings of extra high-catechin GT3 · Moderately overweight Chinese subjects; age and sex not specified | 886 mg | 198 mg | 90 days | — |
| Acute Ingestion of a Mixed Flavonoid and Caffeine Supplement Increases Energy Expenditure and Fat Oxidation in Adult Women: A Randomized, Crossover Clinical Trial 2019 · Mixed flavonoid-caffeine (MFC) supplement · Healthy premenopausal women aged 20–47 years | 368 mg | 214 mg | 1 day | 19 |
| Acute effectiveness of a "fat-loss" product on substrate utilization, perception of hunger, mood state and rate of perceived exertion at rest and during exercise 2015 · SHRED · Healthy recreationally active adults, 24 ± 3.8 years old; five women and seven men | 70 mg | 50 mg | 1 day | 12 |
| Effect of acute administration of an herbal preparation on blood pressure and heart rate in humans 2011 · Experimental treatment product (Acceleron®) · Mildly overweight adult men and women; ages not stated | 222 mg | 704 mg | 1 day | 23 |
| Metabolic response to green tea extract during rest and moderate-intensity exercise 2013 · GTE · Healthy, physically active males | 1.2 g | 240 mg | 7 days | 13 |
| Effects of catechin enriched green tea on body composition 2010 · two servings of control drink (C) · Moderately overweight Chinese subjects; age and sex not specified | 30 mg | 10 mg | 90 days | — |