TempoLife › Funktionen › Herb and spice reference: evidence, dose and interactions › green-tea-extract
Green tea extract
Green tea extract — was die europäische Monographie tatsächlich stützt, wofür es nicht ist, Form und vorgesehene Dauer, Nebenwirkungen und die 3 Arzneimittelwechselwirkungs, die dafür dokumentiert sind.
Das ist eine Referenzseite, keine Diagnose und kein Rezept. Pflanzliche Produkte sind echte Pharmakologie: sie haben Wirkungen, Nebenwirkungen und Wechselwirkungen mit Arzneimitteln. Sagen Sie Arzt und Apotheker alles, was Sie einnehmen, einschließlich Tees und Nahrungsergänzung, und setzen Sie nie ein verordnetes Mittel wegen etwas ab, das Sie hier lesen.
Was es ist
Camellia sinensis (L.) Kuntze — leaf; concentrated catechin extracts
Lokale Namen in der Region, die diese Seite bedient:roheline tee (ET) · vihreä tee (FI) · зелёный чай (RU).
Hier gruppiert unter Kitchen spices with a safety story. Regulatorische Lage:Drinking tea is a food; concentrated extracts are food supplements with an EFSA safety assessment.
Was die Evidenz stützt
Die registrierte Indikation:Marketed for weight loss and metabolism. Neither claim survives review.
The gap between the drink and the capsule is the entire story here. Drinking green tea is not associated with liver harm and is a perfectly ordinary part of a diet. Concentrated green-tea extracts, sold for weight loss and metabolism, are a different exposure altogether: EFSA assessed them and concluded that catechin doses at or above 800 mg of EGCG a day taken as a food supplement have been shown in trials to raise liver transaminases — a marker of liver stress — and that a safe level for supplements could not be established from the available data. Green-tea extract is among the more frequently implicated botanicals in registries of herb-induced liver injury, and taking it on an empty stomach appears to raise absorption and risk. On the weight-loss claim, the effect measured in trials is too small to matter to anyone.
D — Popular claim unsupported, or safety dominates The better trials are negative, or the substance appears in the literature mainly for the harm it has caused.
Wofür es nicht ist
Weight loss, and any liver purpose whatsoever — this is one of the botanicals most likely to injure a liver, not support one.
Form, Stärke und wie lange
Brewed leaf tea (a food), and concentrated catechin extracts in capsules, often combined with caffeine in "fat burner" products.
Dauer.For extracts, the honest answer is that no safe long-term intake has been established.
Auf dieser Seite erscheint absichtlich keine Grammzahl. Pflanzenteil, Extraktionsmittel und Droge-zu-Extrakt-Verhältnis definieren zusammen eine Zubereitung, und eine Zahl aus einer beschreibt eine andere nicht. Die Begründung steht auf dem Hub; die Menge, die für Sie gilt, steht auf der Packung in der Hand, und ein Apotheker liest sie mit Ihnen.
Nebenwirkungen
From tea, the effects of caffeine. From extracts, liver injury: dark urine, yellow eyes or skin, itching, unusual fatigue, pain under the right ribs. Stop immediately and seek medical care if those appear. Nausea and stomach upset are common, particularly fasted.
Wer es meiden sollte
Avoid extracts with any liver condition, in pregnancy and while breastfeeding. Anyone taking a supplement with an unexplained rise in liver enzymes should stop it and tell their doctor what they were taking.
Wechselwirkungen mit Arzneimitteln
| Arzneimittel oder Substanz | Was beschrieben wird |
|---|---|
| Anything else that stresses the liver | Stacking a green-tea extract with alcohol or with other substances that stress the liver is the pattern behind many of the reported cases. |
| Iron supplements and iron-rich meals | Tea polyphenols bind non-haem iron and measurably reduce how much iron is absorbed from a meal taken with tea. If you are being treated for iron deficiency, take iron and tea well apart. |
| Anticoagulants and antiplatelets (warfarin, DOACs, aspirin, clopidogrel) | Green tea leaf contains vitamin K, and large changes in intake have been reported to affect warfarin control. As with all the vitamin K foods, steady intake is what matters, not avoidance. |
Die umgekehrte Sicht — vom Arzneimittel statt von der Pflanze — steht in der Referenz zu Arzneimittel-, Nahrungs- und Alkoholwechselwirkungen, und für jedes Kraut auf dieser Seite zusammengefasst.
Als Lebensmittel
Das eine ist auch in der Küche, daher lohnen sich die Nährwerte neben der Pharmakologie: siehe die Lebensmittelseite für Kalorien und Nährstoffe pro 100 g und pro Portion. Kulinarische Mengen und arzneiliche Zubereitungen sind unterschiedliche Expositionen, und der Unterschied ist meist die ganze Sicherheitsgeschichte.
Quellen:European Food Safety Authority — scientific opinions on coumarin, green tea catechins and hydroxyanthracene derivatives · LiverTox: Clinical and Research Information on Drug-Induced Liver Injury (NIDDK, National Institutes of Health) · NIH National Center for Complementary and Integrative Health — herb fact sheets· geprüft2026-09-06
Häufige Fragen
Wofür wird green tea extract verwendet?
Marketed for weight loss and metabolism. Neither claim survives review. The gap between the drink and the capsule is the entire story here. Drinking green tea is not associated with liver harm and is a perfectly ordinary part of a diet. Concentrated green-tea extracts, sold for weight loss and metabolism, are a different exposure altogether: EFSA assessed them and concluded that catechin doses at or above 800 mg of EGCG a day taken as a food supplement have been shown in trials to raise liver transaminases — a marker of liver stress — and that a safe level for supplements could not be established from the available data. Green-tea extract is among the more frequently implicated botanicals in registries of herb-induced liver injury, and taking it on an empty stomach appears to raise absorption and risk. On the weight-loss claim, the effect measured in trials is too small to matter to anyone.
Wirkt green tea extract?
Hier bewertet D: The better trials are negative, or the substance appears in the literature mainly for the harm it has caused. Weight loss, and any liver purpose whatsoever — this is one of the botanicals most likely to injure a liver, not support one.
Wie viel green tea extract soll ich nehmen?
Diese Referenz druckt keine Grammzahlen, weil sie nicht zwischen Zubereitungen unterschiedlicher Extraktstärke übertragbar sind. Ehrlich sagbar sind Form und Dauer:Brewed leaf tea (a food), and concentrated catechin extracts in capsules, often combined with caffeine in "fat burner" products. For extracts, the honest answer is that no safe long-term intake has been established.
Welche Nebenwirkungen hat green tea extract?
From tea, the effects of caffeine. From extracts, liver injury: dark urine, yellow eyes or skin, itching, unusual fatigue, pain under the right ribs. Stop immediately and seek medical care if those appear. Nausea and stomach upset are common, particularly fasted.
Wechselwirkt green tea extract mit Arzneimitteln?
Ja — dokumentiert fürLiver load, Iron, Anticoagulants, warfarin. Jede ist auf dieser Seite beschrieben, mit einem Link zur Arzneimittel-Referenz, wo eine existiert.
Andere inkitchen spices with a safety story
Cinnamon
Nothing that survives a systematic review. It is a spice with a real safety figure attached.
Garlic
Relief of symptoms of mild circulatory complaints, in traditional-use preparations. Not the treatment of cardiovascular disease.
Nutmeg
Nothing medicinal. It is on this list because it is the kitchen spice that poisons people.
Chilli and cayenne (capsaicin)
Topical relief of muscle and joint pain in low-strength preparations; high-concentration capsaicin patches are licensed medicines for peripheral neuropathic pain.
Die ganze Liste an einem Ort halten
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