Stinging nettle herb (Urtica dioica) is a classic "kidney tea". The European Medicines Agency (EMA) lists it as a traditional herbal medicine for flushing the urinary tract. Here's what that means – and what nettle can't do.
What the EMA monograph says
The EMA recognizes nettle herb for traditional use to increase urine output and flush the urinary tract in minor urinary complaints. "Traditional" means it's based on long-standing experience, not clinical trials. An effect on kidney stones is therefore not proven.
Use according to the monograph
- Tea: 2–4 g of dried herb as an infusion, up to 3 times daily.
- Duration: traditionally 2–4 weeks; if symptoms last more than a week, see a doctor.
- Drink plenty – flushing only works with enough fluid.
- Not for children under 12.
Kidney stones: what's realistic
More urine dilutes stone-forming substances – the most important protection against kidney stones. But you get that effect most reliably from enough water (target: at least 2.5 liters of urine a day per the urology guideline). Nettle tea can be a pleasant part of that intake but doesn't replace stone prevention with citrate, little salt and normal calcium intake.
Who shouldn't use nettle
- With conditions where fluid intake should be limited – such as severe heart or kidney disease.
- During pregnancy and breastfeeding (safety not established).
- If you take diuretics, lithium, blood pressure or diabetes medication, check with your doctor.
- With a nettle allergy.
Possible side effects include mild digestive upset and skin reactions.
Other herbs for the urinary tract: goldenrod and cranberry. The basics: preventing kidney stones naturally.
When to see a doctor
According to the monograph, with fever, painful urination, cramps or blood in the urine – and always with flank pain or colic.
Frequently asked questions
Does nettle tea help with kidney stones? An effect isn't proven by studies, but it can add to the fluid intake that lowers stone risk.
How much nettle tea per day? Per the EMA monograph, 2–4 g of herb as an infusion up to 3 times daily.
How long can you drink nettle tea? Traditionally 2–4 weeks at a time; see a doctor if symptoms persist.
Organic nettle tea and water bottles can be found in our recommendations below.
