TempoLife › Recursos › Herb and spice reference: evidence, dose and interactions › green-tea-extract
Green tea extract
Green tea extract — o que a monografia europeia realmente apoia, para que não é, a forma e por quanto tempo deve ser usado, efeitos colaterais e a 3 interação medicamentosas documentada.
Esta é uma página de referência, não um diagnóstico nem uma receita. Produtos herbais são farmacologia de verdade: têm efeitos, efeitos colaterais e interações. Conte ao médico e ao farmacêutico tudo o que toma, incluindo chás e suplementos, e nunca pare ou mude um medicamento prescrito por causa do que ler aqui.
O que é
Camellia sinensis (L.) Kuntze — leaf; concentrated catechin extracts
Nomes locais na região que este site atende:roheline tee (ET) · vihreä tee (FI) · зелёный чай (RU).
Agrupado aqui em Kitchen spices with a safety story. Posição regulatória:Drinking tea is a food; concentrated extracts are food supplements with an EFSA safety assessment.
O que a evidência apoia
A indicação registrada: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.
Para que não é
Weight loss, and any liver purpose whatsoever — this is one of the botanicals most likely to injure a liver, not support one.
Forma, força e por quanto tempo
Brewed leaf tea (a food), and concentrated catechin extracts in capsules, often combined with caffeine in "fat burner" products.
Duração.For extracts, the honest answer is that no safe long-term intake has been established.
Nenhum número em gramas aparece nesta página de propósito. A parte da planta, o solvente de extração e a razão droga-extrato juntos definem uma preparação, e um número tirado de uma não descreve outra. O raciocínio está no hub; a quantidade que se aplica a você é a impressa na embalagem que segura, e um farmacêutico lê com você.
Efeitos colaterais
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.
Quem deve evitar
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.
Interações com medicamentos
| Medicamento ou substância | O que é descrito |
|---|---|
| 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. |
A visão inversa — começar pelo medicamento em vez da planta — está na referência de interações de medicamentos, alimentos e álcool, e resumido para cada erva neste site.
Como alimento
Este também está na cozinha, então os números de nutrição valem ter ao lado da farmacologia: veja a página de dados de alimentos para calorias e nutrientes por 100 g e por porção. Quantidades culinárias e preparações medicinais são exposições diferentes, e a diferença costuma ser toda a história de segurança.
Fontes: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· verificado2026-09-06
Perguntas frequentes
Para que green tea extract é usado?
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.
green tea extract funciona?
Classificado aqui 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.
Quanto green tea extract devo tomar?
Esta referência não imprime números em gramas, porque não se transferem entre preparações de força de extrato diferente. O que se pode dizer com honestidade é a forma e a duração: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.
Quais os efeitos colaterais de 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.
green tea extract interage com medicamentos?
Sim — documentado paraLiver load, Iron, Anticoagulants, warfarin. Cada uma é descrita nesta página, com um link para a referência do lado medicamento onde existir.
Outros emkitchen 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.
Manter a lista toda num só lugar
TempoLife registra suplementos junto com comida, sono e como você realmente se sentiu — então a resposta a “o que está tomando?” é uma tela, não um palpite.