Kenya
GlucoCare
Fibre, mushroom beta-glucan and mineral formula positioned around glucose metabolism
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Green tea extract: What It Is, What the Evidence Shows and How to Choose a Supplement
Camellia sinensis · Also known as Camellia sinensis extract, EGCG
BioMedic Africa Editorial Desk
Published 29 August 2026 · Last updated 29 August 2026 ·
Editorial policy
Green tea extract concentrates catechins many times beyond a brewed cup. That concentration is the reason it appears in weight-management and metabolic formulas, and also the reason its dose deserves respect.
What is green tea extract?
Green tea is unfermented Camellia sinensis leaf. Kenya is one of the world’s largest tea producers, and green tea processing has expanded alongside its traditional black tea industry.
The catechin fraction, dominated by EGCG, is what supplement extracts concentrate. A capsule may contain the catechin load of several cups.
Traditional and regional use
Tea drinking is deeply established in East Africa, though black tea with milk remains the dominant form. Green tea extract is a modern supplement ingredient rather than a traditional preparation.
What does the research say?
Evidence, not endorsement. What follows describes published research about the ingredient. It is not a claim about any specific product, and no supplement containing this ingredient may claim to treat a disease.
Meta-analyses of green tea catechins report small average effects on body weight and some metabolic markers, generally too small to be noticeable to an individual.
Cardiovascular observational data on tea drinking are more favourable than supplement trial data, and the two should not be conflated.
European authorities have reviewed high-dose green tea catechins in relation to liver safety.
How is it used in supplements?
Green tea extract appears in weight-management, metabolic support and antioxidant complexes, standardised to a percentage of catechins or EGCG.
Forms and sources
- Standardised catechin extract capsules
- Decaffeinated extracts
- Matcha powder
- Brewed tea
Safety
- Brewed green tea has a long record of safe use.
- Concentrated extracts, particularly at high daily EGCG intakes taken on an empty stomach, have been associated with rare liver injury; European risk assessments flagged intakes at and above 800 mg EGCG per day.
- Caffeine content varies; check whether the product is decaffeinated.
Possible side effects
Nausea and stomach discomfort on an empty stomach, and caffeine-related restlessness or sleep disruption.
Interactions
Caffeine content interacts with stimulants. Green tea may also affect the absorption of iron and of some medicines, including certain beta-blockers and statins.
Who should seek professional advice
People with liver conditions, people sensitive to caffeine, people with iron-deficiency anaemia, and anyone pregnant.
How to choose a supplement containing green tea extract
- Look for the EGCG amount per serving in milligrams, not just extract weight.
- Take with food rather than on an empty stomach.
- Check the caffeine content if you also drink coffee or tea daily.
Products containing green tea extract
Products documented in African markets whose supplier material names this ingredient.
Kenya
DibiCure
Plant extract and micronutrient capsules positioned around glucose metabolism
KES 6,750
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Kenya
Prostcare
Saw palmetto, green tea, lycopene and curcumin capsules for men’s urinary comfort
KES 4,999
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Supplement categories using this ingredient
Related health topics
Frequently asked questions
How many cups of tea equal a capsule?
It depends entirely on the extract. A 500 mg extract standardised to 50 % EGCG contains roughly what several brewed cups would deliver, but you should read the specific label.
Does green tea burn fat?
Trials show small average effects on body weight and no dramatic result. It is a minor contributor at best and cannot replace diet and activity changes.
Related ingredients
References
Medical disclaimer. BioMedic Africa publishes consumer health information and supplement research summaries. It is not a pharmacy, a clinic or a medicines regulator, and nothing here is a diagnosis, a prescription or a treatment plan. Dietary supplements are foods, not medicines: they are not intended to diagnose, treat, cure or prevent any disease. Speak with a pharmacist or a qualified healthcare professional before starting any supplement, especially if you are pregnant or breastfeeding, under 18, living with a long-term condition, or taking prescription medication.