This guide reviews all 15 ProstaStream ingredients, what each one is intended to support, how strong the evidence is, and where the label leaves unanswered questions about dose.
By Dr. Marcus Reed, MD · Last Updated: July 23, 2026
Saw palmetto is the best-known botanical on the label and one of the most studied herbs for urinary symptoms linked with an enlarged prostate. It may influence 5-alpha-reductase, the enzyme that converts testosterone into DHT. Some randomized trials have reported fewer nighttime bathroom trips and improved urinary symptom scores, although results across the wider research base are mixed (PMID 12092634).
Beta-sitosterol is a plant sterol with repeated clinical study in men with BPH-related urinary symptoms. Reviews suggest that daily amounts in the 60–130 mg range may improve symptom scores and urine flow. The important limit is easy to miss: it may ease symptoms, but it has not been shown to shrink the prostate itself (PMID 38148931).
Pygeum comes from the bark of the African plum tree and has a long history of use in European prostate formulas. In a meta-analysis of 18 trials, men taking pygeum reported fewer nighttime bathroom trips and better peak urine flow than those taking a placebo. The review estimated a roughly 19% reduction in nocturia, though the underlying studies were generally small and older (PMID 11099686).
Graviola leaf adds antioxidant compounds to the formula. The makers include it as broader cellular and inflammatory support rather than as one of the best-established BPH ingredients. They also say it was among the lead botanicals selected after screening 144 candidates.
Maitake is one of three mushrooms in the blend. Its beta-glucans are better known for general immune and cellular support than for direct relief of urinary symptoms, so it plays a supporting role beside the more prostate-focused ingredients.
Reishi is the second mushroom in the blend. It contains antioxidant and immune-active compounds, and early research has explored possible effects on 5-alpha-reductase and lower urinary tract symptoms. The evidence is not as strong as it is for the formula's core prostate ingredients.
Shiitake completes the mushroom trio. It contributes beta-glucans and antioxidant compounds, mainly for general wellness support rather than as a primary ingredient for BPH symptoms.
Cat's claw (Uncaria tomentosa) is a South American vine used here for antioxidant and immune support. It is a secondary ingredient, included to complement the formula's broader approach to inflammatory balance rather than to act as a stand-alone prostate treatment.
A natural source of lycopene, the carotenoid that gives tomatoes their color. Higher dietary lycopene intake is associated with better prostate outcomes in observational and meta-analytic research (PMID 26287411).
Green tea supplies catechins such as EGCG, antioxidants studied in men at risk of prostate issues. Included to add polyphenol antioxidant support to the formula.
A cruciferous extract containing sulforaphane-family compounds valued for antioxidant and cellular-protection properties that support general prostate wellness.
An essential mineral concentrated heavily in prostate tissue. Some men with prostate concerns show lower zinc levels, and adequate zinc intake is considered supportive of normal prostate function (PMID 31577095).
Paired with zinc to keep the two minerals in balance, since supplemental zinc can deplete copper over time. Copper supports normal antioxidant enzyme activity.
A trace mineral with antioxidant roles via selenoproteins. It is included as part of the broad micronutrient support layer in the formula.
Vitamin E adds fat-soluble antioxidant protection, while Vitamin B6 supports hormone metabolism and general nervous-system function—both frequently paired with prostate blends.
ProstaStream's main advantage is breadth: the formula includes pygeum and three mushrooms that many basic saw-palmetto products leave out. The trade-off is concentration. With 15 ingredients sharing a daily serving, several components appear at modest amounts compared with the doses used in focused clinical studies.
Fifteen prostate-focused ingredients in one daily capsule, with a 60-day money-back guarantee.
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