Saw palmetto berry extract is sold for an enlarged prostate (urinary symptoms).
Calculator Official intake Study doses Best form Safety Sources
This is not an essential nutrient, so there is no official daily intake. Only study doses are shown.
These are doses tested in research, not personal advice. Some exceed the upper limit because they were short courses or given under medical care.
320 mg a day
In 225 men over 49, 160 mg twice a day for a year did not improve symptoms or urine flow against placebo. A Cochrane review of 32 trials (5,666 men) reached the same conclusion, even at double and triple doses.
No best form
Why: High-quality trials of the standard extract showed no benefit over placebo.
Not a normal food.
No well-documented interactions.
See a doctor about urinary symptoms: they can have other causes that need checking.
Pregnant, breastfeeding, on medication, or managing a health condition? Check with a doctor or pharmacist before starting a supplement.
Values checked: November 12, 2026.