NutriStack
Dutasteride and Saw Palmetto, a caution.
Saw palmetto is used for LUTS/BPH and has proposed antiandrogenic activity that overlaps with dutasteride, a dual 5-alpha-reductase inhibitor. PubMed-indexed BPH literature directly compares Serenoa-containing therapy with dutasteride and reviews beta-sitosterol/saw-palmetto pathways, while a recent case series raises concern for persistent sexual and psychiatric symptoms after Serenoa exposure. Co-use may complicate assessment of BPH response, PSA interpretation, sexual adverse effects, and mood symptoms.
One pair, every claim cited. The two substances, the type, the mechanism, the recommendation, and the primary literature.
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What the row says.
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At a glance
- Substances
- Dutasteride and Saw Palmetto
- Pair type
- Caution
- Evidence (highest tier)
- Emerging
- Source citations
- 3 sources
- Stack Score effect
- −5 to your Stack Score (per scored caution row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Caution · Emerging evidence
Caution
What is happening. Saw palmetto is used for LUTS/BPH and has proposed antiandrogenic activity that overlaps with dutasteride, a dual 5-alpha-reductase inhibitor. PubMed-indexed BPH literature directly compares Serenoa-containing therapy with dutasteride and reviews beta-sitosterol/saw-palmetto pathways, while a recent case series raises concern for persistent sexual and psychiatric symptoms after Serenoa exposure. Co-use may complicate assessment of BPH response, PSA interpretation, sexual adverse effects, and mood symptoms.
Mechanism. Dutasteride inhibits type I and type II 5-alpha reductase and substantially lowers DHT. Saw palmetto preparations have proposed antiandrogenic and 5-alpha-reductase-related effects, so the overlap is pharmacodynamic and monitoring-related rather than a proven pharmacokinetic interaction.
Recommendation. Do not add saw palmetto to dutasteride without telling the prescriber. Report changes in libido, erectile function, mood, breast tenderness, urinary symptoms, or PSA monitoring context, especially after starting or stopping saw palmetto.
Sources (3)
- Comparison of Serenoa repens, lycopene, and selenium versus dutasteride for the treatment of LUTS/BPH: an Italian multicenter case-control prospective study (COMP study). Front Urol. 2025. PMID 40777606
- The use of beta-sitosterol for the treatment of prostate cancer and benign prostatic hyperplasia. Am J Clin Exp Urol. 2023. PMID 38148931
- Can we identify a post-Serenoa syndrome (PSS)? A case series on sexual and psychiatric side effects of Serenoa repens. Br J Clin Pharmacol. 2026 Apr. PMID 41507085
Stack Score
How this pair moves the number.
Effect on the composite score
If both Dutasteride and Saw Palmetto are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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