Ingredient profile
Saw Palmetto in Vapofil: A Well-Studied Herb at 1/16 the Dose
Vapofil lists 20 mg of saw palmetto berry extract per two capsules. Trials used 320 mg a day, 16 times more. Even at that dose, a 2023 Cochrane review of 27 studies found little to no benefit for urinary symptoms, and NCCIH calls it probably not helpful. It is usually well tolerated but may add to blood thinners.
Written by the Vapofil editorial teamUpdated
Profile
What does the Vapofil label say about saw palmetto?
Saw Palmetto Berry Extract, 20 mg, is the first line of the Supplement Facts panel.
| Label name | Saw Palmetto Berry Extract |
|---|---|
| What it is | Serenoa repens berry extract |
| Type | Palm berry extract |
| Position on the label | Line 1 of 7 |
| Amount per serving | 20 mg per 2-capsule serving |
| What research shows | Prostate trials used 320 mg a day, and a 2023 Cochrane review of 27 studies found little to no benefit for urinary symptoms |
| Strength of evidence | Studied at 16x the dose, little benefit |
| Why it is in the formula (brand view) | The sales page ties it to prostate claims we cover on one page |
| Main caution | May raise bruising and bleeding risk with warfarin and other blood thinners. Usually mild stomach upset or headache if any. |
The plant
What is saw palmetto?
Saw palmetto is a small palm with dark berries. Extracts of the berry are among the most studied herbal products for men. Most trials asked one question. Does it ease urinary symptoms from an enlarged prostate? That common, noncancerous condition is called BPH.
Vapofil uses a berry extract, the same plant part as the trials. The label prints the weight of dried extract, as federal rules require (21 CFR 101.36, Supplement labels). It gives no standardization, so you learn the extract weight, not the level of any marker compound.
Dose check
How does 20 mg of saw palmetto compare with the trials?
Each bar shows a label amount against a studied amount. Saw palmetto is the first bar.
Trials gave 160 mg twice a day or 320 mg once a day (LiverTox, Saw palmetto). Vapofil's 20 mg is 1/16 of that, about 6%. Reaching 320 mg would take 32 capsules a day. No one should try that: the label says two and warns not to exceed it.
Research
What did the big saw palmetto studies find?
Large trials, one clear pattern.
| Study | Who and how long | Dose | Result |
|---|---|---|---|
| Cochrane review, 2023 | 27 studies, 4,656 men | Usually 320 mg a day | Symptom scores 0.90 points better than placebo: little to no difference |
| Bent trial, 2006 | 225 men for one year | Not stated in our source | No difference from placebo in symptoms, flow or prostate size |
| Two NIH-funded trials | Men with BPH symptoms | One tested up to 3 times the usual dose | Did not improve symptoms |
The Cochrane authors rated their main finding as high-certainty evidence and concluded that saw palmetto alone provides little to no benefit for men with lower urinary tract symptoms (Cochrane review, Saw palmetto). NCCIH sums it up the same way: saw palmetto is probably not helpful for BPH symptoms (NCCIH, Saw palmetto).
In context
Where does saw palmetto sit on the evidence ladder?
Higher means more and better research, not a better result.
- 4Guidelines and large trials
- 3Several trials, pooled
- 2Small human trials
- 1Lab and animal studies
- Vapofil itselfNo trials found(NCCIH, Sexual enhancement supplements)
- Horny goat weed (icariin)Mostly lab and animal(MSKCC, Epimedium) (LiverTox, Horny goat weed)
- Tongkat ali, 100-600 mg extractSmall trials, mixed(Leisegang 2022, Tongkat ali meta-analysis) (LiverTox, Tongkat ali)
- Saw palmetto, 320 mgMany trials: little to no benefit(Cochrane review, Saw palmetto)
- PDE5 inhibitors (prescription)Guideline treatment for ED(AUA, ED guideline) (NIDDK, ED treatment)
Higher means more and better research, not a better result: saw palmetto has strong research showing little benefit for urinary symptoms. Vapofil's doses sit well below the studied amounts, and no trial tested the product.
Saw palmetto climbs higher than any other Vapofil ingredient because so many trials exist. Those trials mostly agree that it does little for urinary symptoms. That is a useful lesson about labels: a famous ingredient is not the same as a working dose.
Safety
Is saw palmetto safe?
For most men, yes, at studied doses. NCCIH says it was generally well tolerated in studies lasting up to 3 years (NCCIH, Saw palmetto). Side effects are uncommon and mild.
Mild side effects
Stomach upset, diarrhea, fatigue, headache, decreased libido and a runny nose, mostly at rates similar to placebo (MSKCC, Saw palmetto).
Blood thinners
It may raise bruising and bleeding risk with warfarin and other blood thinners, and may add to drugs such as clopidogrel (MSKCC, Saw palmetto).
LiverTox rates it a possible, rare cause of liver injury (LiverTox, Saw palmetto), and NCCIH says it may be unsafe in pregnancy or breastfeeding (NCCIH, Saw palmetto). At 20 mg a day, problems are less likely still. The full list of cautions is on the Vapofil side effects page.
Marketing
Why is saw palmetto in Vapofil?
The brand does not explain its dose choices. The sales page ties saw palmetto to prostate and hormone claims that we do not repeat; each one is checked against the evidence on the sales claims page. MSK notes that saw palmetto is not an effective treatment for prostate cancer (MSKCC, Saw palmetto).
New urinary symptoms or erection problems are worth a doctor's visit. Erection trouble can flag heart disease or diabetes early (AUA, ED guideline). For the wider evidence, read our article on saw palmetto and prostate research.
Keep exploring
Which Vapofil ingredient comes next?
Saw palmetto is line 1 of 7 on the label. Pick any other profile below.
FAQ
Saw palmetto FAQ
How much saw palmetto should I take a day?
Trials used 320 mg a day, either at once or as 160 mg twice daily (LiverTox, Saw palmetto). Vapofil gives 20 mg. Even the trial dose showed little to no benefit for urinary symptoms (Cochrane review, Saw palmetto), so ask your doctor before choosing any amount.
Can such a small saw palmetto dose have an effect?
Probably not. It is 1/16 of the trial dose, and the trial dose itself performed about the same as placebo in a review of 27 studies (Cochrane review, Saw palmetto). No study has tested 20 mg.
Does saw palmetto shrink the prostate?
The evidence says no. A one-year trial of 225 men found no difference from placebo in prostate size, urine flow or symptoms (LiverTox, Saw palmetto).
Can saw palmetto lower libido?
It can in some men. MSK lists decreased libido among reported side effects, though most side effects were mild and occurred at rates similar to placebo (MSKCC, Saw palmetto).
Does saw palmetto interact with blood thinners?
It may. MSK says it may raise the risk of bruising and bleeding with warfarin and other blood thinners, and may add to antiplatelet drugs such as clopidogrel (MSKCC, Saw palmetto). Tell your doctor before starting.
Is saw palmetto safe to take long term?
It was generally well tolerated in studies lasting up to 3 years (NCCIH, Saw palmetto). LiverTox rates it a possible, rare cause of liver injury (LiverTox, Saw palmetto).
Does saw palmetto help with prostate cancer?
No. MSK states that saw palmetto is not an effective treatment for prostate cancer (MSKCC, Saw palmetto). Anyone with prostate concerns should see a doctor.
Who wrote this
Written and reviewed by
Plain-language pages built from the label, the sales page and linked public health sources.
Last updated . Our editorial standards explain how we check reviews. This website is run by Vapofildaily, a U.S. stocking partner for Vapofil, not by the manufacturer or the distributor named on the label. Purchases through our order links earn us a commission.
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Saw palmetto evidence
The 2023 Cochrane review, two NIH trials and what 20 mg of saw palmetto means next to the 320 mg studied.
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Dose guide
Each Vapofil amount next to the dose used in research, plus what the label's extract ratios do and do not tell you.
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