Green Tea
Camellia sinensis
T Traditional useGreen tea is traditionally used to relieve fatigue and a feeling of weakness; it contains caffeine and is unsuitable with high blood pressure or ulcers.
Image: Herbadex Botanik Stüdyosu · Özel Üretim
On this page
At a glance
The EMA classes unfermented tea leaf (green tea) as a traditional herbal medicine for fatigue and a feeling of weakness. Because it contains caffeine, it must not be used with high blood pressure, heart rhythm disorders, stomach ulcers or an overactive thyroid. The monograph has no indication for weight loss.
Updated: October 15, 2026
✓ This herb record is backed by official European Medicines Agency (EMA HMPC) herbal monographs.
What is it used for?
T Traditional use
Traditional use: Based on at least 30 years of documented traditional use rather than clinical trials.
How do we rate evidence levels? →Traditionally used to relieve fatigue and a feeling of weakness. [1]
How is it used?
Tea
Pour 100–150 ml of boiling water over 1.8–2.2 g of green tea leaf.
Amount: 3–5 times daily
Duration limit: See a doctor if no better within 1 week
[1]Safety & interactions
Minimum age: 18 years
- Do not use with stomach or duodenal ulcers, high blood pressure, heart rhythm disorders or an overactive thyroid.
- Not recommended before bedtime as it may disturb sleep.
- Not recommended under 18. Not recommended in pregnancy or breastfeeding because safety has not been shown.
Drug interactions
| Medicine / substance | Effect | Severity |
|---|---|---|
| Sedative medicines | Caffeine may reduce the effect of sedatives. [1] | Moderate |
| Sympathomimetic medicines (e.g. some decongestants) | Caffeine may increase their side effects. [1] | Moderate |
Side effects
- None known according to the monograph; report any unexpected effect to a doctor
⚕ When to see a doctor
- If high fever, shortness of breath or purulent/bloody phlegm develops
- If symptoms do not improve within 1–2 weeks or worsen
- If severe abdominal pain, jaundice, rash or allergic reaction occurs
Did you know?
Green tea uses about 2 g of leaf in 100–150 ml of boiling water. [1]
Frequently asked questions
Does green tea help weight loss?
The EMA monograph has no weight-loss indication; the assessment covers fatigue and weakness.
How do I make green tea?
Pour 100–150 ml of boiling water over 1.8–2.2 g of leaf; drink 3–5 cups a day.
Who should not drink green tea?
People with high blood pressure, heart rhythm disorders, stomach ulcers or an overactive thyroid; pregnant and breastfeeding women should not use it as medicine.
Can I drink green tea in the evening?
It contains caffeine and may disturb sleep; the EMA does not recommend it before bedtime.
Sources
Cite This Page
Green Tea (Camellia sinensis). Herbadex — Doğal Şifa Rehberi (2026). https://herbadex.com/en/herb/green-tea/
Related guides and comparisons
Related herbs
Ginkgo Leaf
A Strong clinical evidenceGinkgo biloba
Standardised ginkgo extract may help age-related cognitive decline and mild dementia; bleeding risk and interactions call for caution.
Black Tea
A Strong clinical evidenceCamellia sinensis
Its caffeine and L-theanine increase attention and alertness. Observational studies link regular tea drinking to lower cardiovascular risk.
Eleuthero
T Traditional useEleutherococcus senticosus
Eleuthero (Siberian ginseng) root is traditionally used for symptoms of weakness such as fatigue; do not use it for more than 2 months.
Korean Ginseng
T Traditional usePanax ginseng
Korean ginseng (Panax ginseng) root is traditionally used for symptoms of weakness such as fatigue; use it for no more than 3 months.
Rhodiola
T Traditional useRhodiola rosea
Rhodiola (Rhodiola rosea) extract is traditionally used to relieve symptoms of stress such as fatigue and exhaustion in adults.
Yerba Mate
T Traditional useIlex paraguariensis
Traditionally used for tiredness and weakness, and to increase urine in minor urinary complaints. Contains caffeine; avoid with high blood pressure or ulcers.
Other herbs in the same preparation form (Dried Herb & Tea)
Dried Herb & Tea →
Echinacea
A Strong clinical evidenceEchinacea purpurea
Juice pressed from fresh echinacea plants may help with short-term prevention and treatment of colds. Dried echinacea tea is not covered.
Psyllium Husk
A Strong clinical evidencePlantago ovata
Taken with plenty of water, psyllium husk helps soften stools in constipation; keep a gap between it and other medicines.
Senna
A Strong clinical evidenceSenna alexandrina
A stimulant laxative for short-term relief of occasional constipation. No longer than 1 week; not for children under 12, in pregnancy or while breastfeeding.
St. John's Wort
A Strong clinical evidenceHypericum perforatum
St John's wort extract may help with mild to moderate depressive episodes, but it seriously interacts with many medicines, including the pill.
