Research review
Does alfalfa help with kidney stones or kidney disease? What the research does and doesn't show
No controlled human trial has tested alfalfa, in any form, for kidney stones or kidney disease. The entire human research record for alfalfa is two small studies — one on cholesterol, one on fertility — and neither measured a kidney-related outcome.
No human trial has tested alfalfa, in any form, for kidney stones or kidney disease. That's a real gap, not a settled "no" — the entire controlled human research record for alfalfa is two small studies, one on cholesterol and one on fertility, and neither one measured anything about the kidneys.
What the evidence doesn't support
It doesn't support alfalfa supplements, tea, seeds or sprouts as something that prevents or dissolves kidney stones, lowers the risk of forming one, or treats, slows or manages kidney disease. That's a different statement from a trial that tested the question and found nothing — no controlled human study has looked at either outcome at all, so there's no research record to draw a conclusion from either way.
What the trials found
A 1980 study gave three human volunteers a diet containing whole alfalfa seeds for three weeks and tracked their cholesterol levels; it didn't measure kidney function, stone formation, or urine chemistry. A 2024 randomized trial gave 60 men with a fertility diagnosis 6 grams a day of alfalfa seed powder alongside vitamin E for 12 weeks and tracked sperm count, motility and shape; it recorded two withdrawals (one for bloating, one for a respiratory allergic reaction), but no kidney-related outcome. A 2014 study fed a concentrated alfalfa saponin extract to 40 hyperlipidemic rats and measured cholesterol and liver markers; the published results don't report a kidney or renal finding either. Between them, these three studies are the entire controlled record for alfalfa, human or animal, and none of them answers a question about kidney stones or kidney disease.
Questions people ask
Does alfalfa help with kidney stones?
No trial has tested this. Alfalfa shows up in folk remedies and online lists for kidney stones, but there's no controlled study — in people or in animals — measuring stone formation, stone passage, or urine chemistry with alfalfa.
Is alfalfa good for kidney disease, or bad for it?
Neither has been tested directly. What we do have is a documented drug interaction relevant to some kidney patients: a National Institutes of Health reference monograph advises against combining alfalfa with warfarin because of its vitamin K content — worth raising with a doctor if you take a blood thinner and have kidney disease. See alfalfa and medications: what to check.
Does alfalfa tea affect the kidneys?
No trial has tested alfalfa tea for kidney stones, kidney function, or any other outcome. See alfalfa tea for what the (unrelated) human research actually used instead of brewed leaf.
Can alfalfa "detox" the kidneys?
No — "kidney detox" isn't a measurable, tested outcome, and no trial has given alfalfa to anyone for that purpose. See does alfalfa help with detox and cleanse? for the fuller picture on that framing.
When to talk to a doctor
Kidney stones and kidney disease are diagnosed and monitored medically, and alfalfa is not a treatment for either. Sudden flank pain, blood in the urine, or a known kidney condition are reasons to see a doctor, not to self-treat with a supplement that hasn't been tested for the purpose. See who should not take alfalfa and alfalfa side effects for the documented safety picture.
Sources
- Alfalfa seeds: effects on cholesterol metabolism In 1980, three people who ate alfalfa seeds for three weeks had lower plasma cholesterol afterward, with no toxicity detected on blood tests during that short period — the entire human record on alfalfa and cholesterol.
- Effect of Medicago sativa seed powder (Plus vitamin E vs. vitamin E alone) on semen analysis in men with idiopathic infertility: A double blind randomized clinical trial In a 2024 trial, 60 men with a fertility diagnosis who took 6 g/day of alfalfa seed powder alongside vitamin E for 12 weeks had bigger improvements in sperm count, motility and shape than men taking vitamin E alone; one person dropped out with bloating and one with an allergic reaction.
- The regulation of alfalfa saponin extract on key genes involved in hepatic cholesterol metabolism in hyperlipidemic rats In rats fed a high-fat diet, a concentrated alfalfa saponin extract changed liver gene activity in a pattern consistent with the liver clearing more cholesterol — a plausible mechanism, but from an animal study using an extract, not a human trial.
- Alfalfa A National Institutes of Health reference monograph describes alfalfa's composition (saponins, isoflavones, vitamin K, L-canavanine), notes it's generally recognized as safe as a food, and flags two specific concerns: possible lupus worsening and a vitamin K interaction with warfarin.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.