Saw Palmetto · Serenoa repens

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Connected to · 2

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BPH
Saw palmetto is the best-selling prostate supplement, yet two large randomized trials, STEP and CAMUS, found it no better than placebo for the urinary symptoms of an enlarged prostate, and a Cochrane review of 32 trials reached the same conclusion. It is broadly safe, but it has been tested and showed no effect.
Milk Thistle
Two examples of one pattern: early small trials looked positive, and the effect disappeared once larger, stricter randomized trials were done. For saw palmetto that means the STEP and CAMUS trials plus an updated Cochrane review; for milk thistle, a Cochrane review that found no effect on death or complications.

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Enlarged prostate and saw palmetto

EVIDENCEGUIDE 1 · COHORT 1

READ THE ORIGINAL

Saw palmetto is the most common herbal supplement sold for an enlarged prostate. Its selling point sounds plausible as a mechanism, yet in large, rigorously designed trials it did no better than placebo.

Start with the problem it is sold to fix. The prostate does not sit beside the urethra; it wraps all the way around it, like a doughnut slipped over a hose, so when it thickens, the hose is what gets squeezed. With age, testosterone inside prostate cells is rewritten by 5α-reductase into DHT (dihydrotestosterone), which binds its receptor far more strongly, and DHT drives the gland and the surrounding stroma (which holds a lot of smooth muscle) to grow. With the urethra cinched, the stream is slow to start, runs thin, and never feels finished; the bladder, pushing against that narrow outlet every day, turns sensitive itself and wants to go when only a little has collected. That is benign prostatic hyperplasia (BPH).

Saw palmetto's pitch lands at the very top of this chain: in a test tube, it can block the enzyme that rewrites testosterone.

If one day you cannot pass urine at all and your lower belly is swollen and painful, that is acute urinary retention: go to the emergency department now, and do not wait for any supplement to work.

Educational content, not medical advice — consult a clinician.

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Saw Palmetto · Serenoa repens

Story

Connected to · 2

contrast · 2

BPH
Saw palmetto is the best-selling prostate supplement, yet two large randomized trials, STEP and CAMUS, found it no better than placebo for the urinary symptoms of an enlarged prostate, and a Cochrane review of 32 trials reached the same conclusion. It is broadly safe, but it has been tested and showed no effect.
Milk Thistle
Two examples of one pattern: early small trials looked positive, and the effect disappeared once larger, stricter randomized trials were done. For saw palmetto that means the STEP and CAMUS trials plus an updated Cochrane review; for milk thistle, a Cochrane review that found no effect on death or complications.

Read full story

Stop 1/5

Enlarged prostate and saw palmetto

EVIDENCEGUIDE 1 · COHORT 1

READ THE ORIGINAL

Saw palmetto is the most common herbal supplement sold for an enlarged prostate. Its selling point sounds plausible as a mechanism, yet in large, rigorously designed trials it did no better than placebo.

Start with the problem it is sold to fix. The prostate does not sit beside the urethra; it wraps all the way around it, like a doughnut slipped over a hose, so when it thickens, the hose is what gets squeezed. With age, testosterone inside prostate cells is rewritten by 5α-reductase into DHT (dihydrotestosterone), which binds its receptor far more strongly, and DHT drives the gland and the surrounding stroma (which holds a lot of smooth muscle) to grow. With the urethra cinched, the stream is slow to start, runs thin, and never feels finished; the bladder, pushing against that narrow outlet every day, turns sensitive itself and wants to go when only a little has collected. That is benign prostatic hyperplasia (BPH).

Saw palmetto's pitch lands at the very top of this chain: in a test tube, it can block the enzyme that rewrites testosterone.

If one day you cannot pass urine at all and your lower belly is swollen and painful, that is acute urinary retention: go to the emergency department now, and do not wait for any supplement to work.

Educational content, not medical advice — consult a clinician.