TempoLife › Recursos › Herb and spice reference: evidence, dose and interactions › nettle
Nettle
Nettle — 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
Urtica dioica L. — leaf and herb (Urticae folium), and root (Urticae radix)
Nomes locais na região que este site atende:nõges (ET) · nokkonen (FI) · крапива (RU).
Agrupado aqui em Joints, urinary tract and hormones. Posição regulatória:EU herbal monograph — traditional use (separate monographs for leaf and root).
O que a evidência apoia
A indicação registrada:Leaf: to increase the amount of urine and so flush the urinary tract in minor complaints, and for minor joint pain. Root: lower urinary tract symptoms related to benign enlargement of the prostate.
Leaf and root are two different medicines from one plant, and mixing them up is the usual error. The leaf — the spring soup and tea plant across the whole Baltic and Nordic region — carries an aquaretic indication: increasing urine volume to flush the urinary tract, with a firm instruction to drink plenty of fluid while doing it. That flushing use is explicitly not a treatment for a urinary infection. Fever, pain in the flank, blood in the urine, or symptoms lasting more than a couple of days mean a clinician, because an untreated kidney infection is serious and a diuretic tea does nothing about the bacteria. The root has a completely separate indication for the urinary symptoms of an enlarged prostate, with the same rule attached: a doctor should have excluded other causes of those symptoms first. Nutritionally the cooked or dried leaf is a genuinely good spring green — cooking and drying destroy the sting.
C — Traditional use only Plausible from thirty or more years of use, which is what a traditional-use registration means. No clinical evidence was required and none has settled it.
Para que não é
Urinary tract infections, kidney stones, or prostate symptoms that have never been assessed. Flushing regimes are actively wrong in heart failure and in kidney disease where fluid is restricted.
Forma, força e por quanto tempo
Dried leaf as an infusion, fresh leaf as food, leaf extracts and tinctures, and separately root extracts in capsules for prostate symptoms.
Duração.Short courses for the leaf indications. Prostate symptoms are a long-term matter and belong with a doctor.
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
Mild stomach upset and allergic skin reactions. The stinging hairs on the fresh plant cause the familiar rash, which is mechanical rather than allergic.
Quem deve evitar
Do not use flushing regimes where fluid must be restricted — heart failure, kidney impairment. Not established in pregnancy for medicinal amounts.
Interações com medicamentos
| Medicamento ou substância | O que é descrito |
|---|---|
| Anticoagulants and antiplatelets (warfarin, DOACs, aspirin, clopidogrel) | Nettle leaf is high in vitamin K, the nutrient warfarin works against. A sudden switch to daily nettle soup or nettle tea in spring can shift INR. Keep intake steady and tell whoever monitors it — this is one of the few genuinely seasonal interactions in northern Europe. |
| Blood-pressure medicines, diuretics and corticosteroids | Increasing urine output alongside diuretics or blood-pressure medicines is not automatically harmful, but it belongs on the list, especially with heart failure or kidney disease, where a flushing regime is exactly the wrong idea. |
| Diabetes medicines and insulin | Reports of blood-glucose lowering exist; monitor rather than assume if you are on glucose-lowering medicines. |
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.
Fontes:European Medicines Agency — Committee on Herbal Medicinal Products (HMPC), European Union herbal monographs · NIH National Center for Complementary and Integrative Health — herb fact sheets· verificado2026-09-06
Perguntas frequentes
Para que nettle é usado?
Leaf: to increase the amount of urine and so flush the urinary tract in minor complaints, and for minor joint pain. Root: lower urinary tract symptoms related to benign enlargement of the prostate. Leaf and root are two different medicines from one plant, and mixing them up is the usual error. The leaf — the spring soup and tea plant across the whole Baltic and Nordic region — carries an aquaretic indication: increasing urine volume to flush the urinary tract, with a firm instruction to drink plenty of fluid while doing it. That flushing use is explicitly not a treatment for a urinary infection. Fever, pain in the flank, blood in the urine, or symptoms lasting more than a couple of days mean a clinician, because an untreated kidney infection is serious and a diuretic tea does nothing about the bacteria. The root has a completely separate indication for the urinary symptoms of an enlarged prostate, with the same rule attached: a doctor should have excluded other causes of those symptoms first. Nutritionally the cooked or dried leaf is a genuinely good spring green — cooking and drying destroy the sting.
nettle funciona?
Classificado aqui C: Plausible from thirty or more years of use, which is what a traditional-use registration means. No clinical evidence was required and none has settled it. Urinary tract infections, kidney stones, or prostate symptoms that have never been assessed. Flushing regimes are actively wrong in heart failure and in kidney disease where fluid is restricted.
Quanto nettle 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:Dried leaf as an infusion, fresh leaf as food, leaf extracts and tinctures, and separately root extracts in capsules for prostate symptoms. Short courses for the leaf indications. Prostate symptoms are a long-term matter and belong with a doctor.
Quais os efeitos colaterais de nettle?
Mild stomach upset and allergic skin reactions. The stinging hairs on the fresh plant cause the familiar rash, which is mechanical rather than allergic.
nettle interage com medicamentos?
Sim — documentado paraAnticoagulants, warfarin, Blood pressure, Diabetes medicines. Cada uma é descrita nesta página, com um link para a referência do lado medicamento onde existir.
Outros emjoints, urinary tract and hormones
Saw palmetto
Relief of lower urinary tract symptoms related to benign prostatic hyperplasia, after a doctor has excluded serious conditions.
Cranberry
Reducing the chance of repeat urinary tract infections in some groups — not treating an infection that is already present.
Black cohosh
Relief of menopausal complaints such as hot flushes and profuse sweating.
Devil's claw
Relief of minor joint pain, and of mild digestive complaints such as bloating and loss of appetite.
Feverfew
Prophylaxis of migraine headaches, after serious conditions have been excluded by a doctor.
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.