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Men often turn to herbal remedies to manage lower urinary tract symptoms (LUTS) linked to benign prostatic hyperplasia (BPH), often without discussion with a clinician. A review of the evidence suggests that while some plant-based medicines may offer modest symptom relief, their benefits are inconsistent, and important questions about their effectiveness persist.

Saw Palmetto

Saw palmetto (Serenoa repens) contains free fatty acids, phytosterols, and other lipophilic compounds. These compounds exhibit antiandrogenic, anti-inflammatory, and antiproliferative effects.

Clinical evidence varies considerably depending on the specific extract used. A Cochrane review found no clinically meaningful benefit compared with placebo, even at higher doses. However, the findings have been inconsistent throughout studies. Differences in manufacturing in terms of extraction methods and product composition may partly explain this variability.

Pumpkin Seed

Cucurbita pepo (pumpkin) contains phytosterols, unsaturated fatty acids, tocopherols, carotenoids, and other trace elements. The proposed mechanisms include effects on inflammation, bladder function, and androgen metabolism.

In one randomized study, pumpkin seed oil improved symptoms of BPH compared with no treatment but was less effective than guideline-recommended therapy with tamsulosin.

A larger placebo-controlled trial conducted over 12 months demonstrated clinically meaningful reductions in symptoms, measured using the International Prostate Symptom Score, compared with placebo.

Another study suggested that pumpkin seed extract might improve symptoms and quality of life without adversely affecting sexual function.

Nettle Root

Stinging nettle root (Urtica dioica radix) contains lignans, polysaccharides, sterols, lectins, and phenolic compounds. These substances appear to exert anti-inflammatory effects and influence several signaling pathways associated with BPH and LUTS.

BPH is not caused solely by elevated androgen levels but results from interactions among hormonal, inflammatory, and growth-related pathways. Stinging nettle roots is thought to target several of these mechanisms.

A randomized double-blind trial showed symptomatic benefits in men with BPH. Earlier studies also reported improvements in symptom scores and reductions in inflammatory and oxidative stress markers. However, the overall evidence remains limited.

Pollen Extract

Rye pollen extract (commonly known by its marketed brand, Cernilton) contains water-soluble and lipid-soluble pollen fractions, amino acids, phytosterols, and phenolic compounds.

Systematic reviews suggested moderate improvements in overall urinary symptoms, particularly nocturia. However, most available studies were older, relatively small, and limited by methodological limitations.

Beta-Sitosterol

Beta-sitosterol is a plant-derived phytosterol widely used in phytotherapy for the management of BPH.

One review found improvements in symptom scores and urinary flow compared with placebo. However, most studies were short-term and conducted many years ago. Data on long-term safety, disease progression, urinary retention, and avoidance of surgery remain limited.

Although beta-sitosterol may improve symptoms, it is not clinically equivalent to established pharmacologic therapies.

African Cherry

Extracts from the bark of Prunus africana, commonly known as African cherry or pygeum, contain phytosterols, triterpenes, and ferulic acid esters.

Anti-inflammatory and antiproliferative effects have been proposed as potential mechanisms of action.

Systematic reviews and meta-analyses have reported moderate improvements in urinary symptoms and urinary flow measures. However, most of these studies were older, relatively small, and methodologically limited.

Pygeum may be an option for men with mild LUTS but should be used only in standardized formulations.

Combination Products

Many supplements combine saw palmetto, stinging nettle, pygeum, pumpkin seeds, and plant sterols.

This approach reflects the multifactorial nature of LUTS, including inflammation, smooth muscle dysfunction, prostate enlargement, and bladder overactivity. However, substantial variation in formulations makes meaningful comparisons across studies difficult.

Therefore, such herbal medicines represent a pragmatic approach to symptom management rather than clear evidence-based therapy.

Conclusion

Among herbal remedies, beta-sitosterol and certain standardized saw palmetto extracts have the strongest supporting evidence, although the overall quality of evidence remains limited.

Their effects are substantially less effective than those of guideline-recommended pharmacologic treatments such as alpha blockers and 5-alpha reductase inhibitors.

Although the European Association of Urology Guidelines often evaluate herbal remedies for these conditions, they also highlight the significant heterogeneity across different formulations and the limited comparability of clinical data.

In clinical practice, herbal remedies remain an option for patients with mild-to-moderate LUTS who do not have warning signs if the products undergo appropriate evaluation and maintain realistic expectations regarding potential benefits.

Herbal remedies serve as a viable, low-side-effect management strategy for patients with mild-to-moderate LUTS without warning signs, provided they receive a comprehensive medical evaluation and maintain realistic expectations.

This story was translated from Medscape’s German edition.