Benefits
Supports normal daytime urinary frequency and urgency
In a randomized, double-blind, placebo-controlled trial of 150 adults, a standardized Crataeva nurvala stem bark extract combined with horsetail and Lindera lowered daytime urinary frequency and urgency over 8 weeks versus placebo. The extract was tested inside a three-herb formula and the study was funded by its maker, so the result is not attributable to Crataeva alone.
Supports comfortable nighttime urinary patterns
In the same 150-adult trial, episodes of waking to pass urine at night were fewer over 8 weeks with the Crataeva-containing formula than with placebo, and participants reported better quality of life. The findings reflect a three-herb blend rather than Crataeva nurvala on its own, and the trial was funded by the product maker.
Bladder tone and healthy urinary flow
Crataeva nurvala is used in Ayurveda to support bladder tone and comfortable urination, and standardized extracts are positioned this way. In a placebo-controlled trial in children, a Crataeva-containing formula reduced nighttime bedwetting and daytime urinary urgency, but this was a small multi-herb study funded by the maker.
Supports healthy urinary mineral balance
In a randomized placebo-controlled trial in adults with urinary tract stones, an Ayurvedic two-herb formula of varuna and banana stem reduced stone size and pain scores over three months versus placebo. In rat studies, Crataeva bark decoction and its triterpene lupeol lowered urinary oxalate. This evidence comes from blends and animals, not Crataeva alone.
Antioxidant markers in animal tissue studies
In laboratory and animal research, Crataeva nurvala bark extract and lupeol reduced markers of oxidative stress in rat kidney and prostate tissue and supported the activity of natural antioxidant enzymes. These are preclinical findings in animals and do not show an effect in people.
Mechanism of action
Triterpenes including lupeol
The bark and stem of Crataeva nurvala are rich in pentacyclic triterpenes, especially lupeol. In laboratory and animal studies, lupeol is the constituent most often linked to the herb's effects on the urinary tract, including lower urinary oxalate handling by the kidney.
Support for bladder muscle tone
Traditional use and preclinical research focus on supporting the tone of the bladder's detrusor muscle and normal bladder emptying. Human trials of Crataeva-containing formulas report fewer urinary urgency and frequency episodes, consistent with this idea, though those formulas also contain other herbs.
Antioxidant and anti-inflammatory activity
In cell and animal studies, Crataeva triterpenes scavenge reactive oxygen species and dampen inflammatory signaling in kidney and prostate tissue. These effects have not been measured as clinical outcomes in people.
Clinical trials
Randomized, double-blind, placebo-controlled trial at two primary care centers of Urox, a formula of Crataeva nurvala stem bark with horsetail and Lindera, versus placebo for 8 weeks; funded by the formula's maker. (Schoendorfer et al. 2018, BMC Complement Altern Med)
150 adults (59% women, mean age about 64) with overactive bladder and urinary incontinence.
At 8 weeks, daytime urinary frequency was lower with the formula (about 7.7 vs 10.9 voids/day), with fewer nocturia episodes (about 2.2 vs 3.1 per night) and lower urgency and total incontinence (all p<0.01), plus better quality of life. The formula's inventor holds its patent and the maker funded the study. Crataeva was one of three herbs, so the result cannot be credited to Crataeva alone.
Randomized, double-blind, placebo-controlled trial of Urox (Bedtime Buddy), a 420 mg blend of Crataeva nurvala stem bark standardized to 1.5% lupeol with horsetail and Lindera, once daily; maker-funded. (Schloss et al. 2021, Phytomedicine)
Children aged 6 to 14 with primary nocturnal enuresis; 41 completed the trial.
By two months, 41.7% of children improved on the formula, a statistically significant reduction in bedwetting versus placebo (p=0.034), and daytime urinary urgency fell significantly in the treatment group. The trial was small and maker-funded and tested a three-herb blend rather than Crataeva on its own; a published erratum applies to the paper.
Prospective, randomized, double-blind, placebo-controlled trial of an Ayurvedic two-herb formula of varuna (Crataeva nurvala) and banana stem over three months. (Patankar et al. 2008, J Altern Complement Med)
77 adults with urinary tract calculi larger than 5 mm, grouped by stone size (5 to 10 mm and over 10 mm).
In the 5 to 10 mm group, stone size fell about 33% with the formula versus a 5% increase on placebo (p=0.017); the larger-stone group showed a smaller, non-significant difference. Pain scores were lower with the formula. It was a small two-herb study, and the authors called the results preliminary and asked for a larger phase III trial.
Controlled animal study of ethanolic Crataeva nurvala bark extract (150 mg/kg) in rats given testosterone and a chemical carcinogen over four months. (Kumar et al. 2012, Pharmacogn Mag)
Male Wistar rats with chemically induced prostate oxidative stress (animal model).
The bark extract reduced lipid peroxidation and restored the activity of antioxidant enzymes in prostate tissue compared with untreated animals. This is an animal study of oxidative markers in tissue, not a measure of prostate symptoms or any outcome in people.
Controlled animal study of lupeol (25 mg/kg/day), a triterpene from Crataeva nurvala stem bark, in rats made hyperoxaluric for 15 days. (Malini et al. 1995, Jpn J Med Sci Biol)
Adult male Wistar rats with ammonium-oxalate-induced hyperoxaluria (animal model).
Lupeol lowered urinary oxalate excretion and reduced urinary markers of kidney tubular damage compared with untreated animals, which the authors described as a possible antilithic effect. This is an animal study and does not show stone prevention in people.