The Valve & the Tap
Getting up to urinate at night — nocturia — is one of the most common complaints men bring to a doctor after 50. It usually gets framed as a prostate problem. Often it's two problems at once.
The Valve is the outlet: the prostate and the neck of the bladder. With age the prostate tends to grow and the outlet tightens. The stream weakens or stops and starts, the bladder doesn't fully empty, and the muscle of the bladder wall can become more reactive. A bladder that never fully empties calls again sooner.
The Tap is how much urine your body produces overnight. In younger adults, a hormone rhythm (vasopressin) turns urine production down after dark. That rhythm weakens with age. On top of that, fluid that collects in the legs during the day moves back into circulation when you lie down, and the kidneys process it at night. Clinicians call this nocturnal polyuria — producing a large share of the day's urine at night — and studies of older adults with nocturia report it in a large share of cases.
A prostate-only pill works on the Valve. If your tank is refilling fast at night, it can't touch that side.
That's the thinking behind Kestran: one formula taken morning and evening to support the Valve through the day and night, plus a simple routine aimed at the Tap.
Why there's no saw palmetto
Saw palmetto is the default ingredient in most prostate supplements. It's also the one that has been tested hardest.
- The STEP trial (NIH-funded, published in the New England Journal of Medicine, 2006) compared saw palmetto with placebo for a year and found no difference in urinary symptoms or flow.
- The CAMUS trial (NIH-funded, JAMA, 2011) raised the dose up to three times the usual amount over 72 weeks. It still did not outperform placebo.
- An updated Cochrane review of randomized trials reached the same conclusion for urinary symptoms.
Plenty of men still swear by it, and it's generally well tolerated. But capsule space is limited, and we'd rather spend it on ingredients with a stronger evidence base.
Ingredients & doses
Per daily serving of two capsules. "Studied at" is the amount used in the research we cite below.
| Ingredient | Kestran | Studied at | Supports* |
|---|---|---|---|
| Beta-sitosterol from plant sterols | 300 mg | 60–130 mg/day pure beta-sitosterol in randomized trials [1] | Normal urine flow, more complete emptying |
| Stinging nettle root extract Urtica dioica | 360 mg | 360 mg/day in a 6-month placebo-controlled trial [2] | Healthy prostate function |
| Pumpkin seed oil Cucurbita pepo | 320 mg | 320 mg/day in a placebo-controlled trial [3] | Bladder comfort |
| Flower pollen extract rye grass, Secale cereale | 126 mg | Rye-grass pollen extracts reviewed across controlled trials, including effects on nighttime urination [4] | A calm bladder overnight |
| Pygeum bark extract Prunus africana, 2.5% total sterols | 100 mg | 75–200 mg/day across trials in a Cochrane review, which reported improvement in nighttime urination versus placebo [5] | Prostate function, bladder comfort |
Other ingredients: hypromellose (vegetable capsule), microcrystalline cellulose, silicon dioxide. Contains flower pollen.
Why one formula, two doses
Kestran is a single formula. You take the same capsule twice: once with breakfast and once after dinner. Splitting the daily amount keeps the dose manageable — one capsule at a time instead of a handful — and puts the second dose closer to the hours when nighttime symptoms show up.
The Night Routine
These are standard, low-cost habits clinicians suggest for nighttime urination, and they work on the Tap side of the problem [6]. A card with the routine comes in every box.
- Caffeine curfew at 2 p.m. Caffeine increases urine production and bladder irritability for hours.
- Taper fluids after dinner. Drink well earlier in the day and go easy in the last few hours before bed, including alcohol.
- Legs up in the late afternoon. Thirty minutes with your feet raised lets fluid that pooled in your legs return before bedtime rather than overnight.
- Go twice before bed. Empty your bladder, wait a minute or two, then try again.
Count your trips each night on the Night Count card. Invisible progress is the reason most people quit; a number on paper makes it visible.
What Kestran doesn't do
Kestran is a dietary supplement. It is not a drug and it is not intended to diagnose, treat, cure or prevent any disease, including benign prostatic hyperplasia or prostate cancer. It does not lower PSA and it does not replace screening.
References
- Wilt T, Ishani A, MacDonald R, et al. Beta-sitosterols for benign prostatic hyperplasia. Cochrane Database of Systematic Reviews. 1999;(3):CD001043.
- Safarinejad MR. Urtica dioica for treatment of benign prostatic hyperplasia: a prospective, randomized, double-blind, placebo-controlled, crossover study. Journal of Herbal Pharmacotherapy. 2005;5(4):1–11.
- Hong H, Kim CS, Maeng S. Effects of pumpkin seed oil and saw palmetto oil in Korean men with symptomatic benign prostatic hyperplasia. Nutrition Research and Practice. 2009;3(4):323–327.
- MacDonald R, Ishani A, Rutks I, Wilt TJ. A systematic review of Cernilton for the treatment of benign prostatic hyperplasia. BJU International. 2000;85(7):836–841.
- Wilt T, Ishani A, MacDonald R, et al. Pygeum africanum for benign prostatic hyperplasia. Cochrane Database of Systematic Reviews. 2002;(1):CD001044.
- Nocturia in older adults: highlighting nocturnal polyuria. U.S. Pharmacist. See also: The prevalence of nocturnal polyuria in the United States — results from the Epidemiology of Nocturnal Polyuria Study. European Urology Focus. 2022.
- Bent S, Kane C, Shinohara K, et al. Saw palmetto for benign prostatic hyperplasia. New England Journal of Medicine. 2006;354(6):557–566.
- Barry MJ, Meleth S, Lee JY, et al. Effect of increasing doses of saw palmetto extract on lower urinary tract symptoms: a randomized trial. JAMA. 2011;306(12):1344–1351.
- Tacklind J, MacDonald R, Rutks I, et al. Serenoa repens for benign prostatic hyperplasia. Cochrane Database of Systematic Reviews. 2012;12:CD001423.
*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.
