Saw Palmetto (Serenoa repens) vs Urolithin A

Mechanism

Saw palmetto berry extract contains fatty acids (lauric acid, oleic acid, myristic acid) and phytosterols (beta-sitosterol) that inhibit both isoforms of 5-alpha-reductase (types I and II), reducing conversion of testosterone to dihydrotestosterone (DHT). It also exhibits anti-androgenic activity by competing with DHT at androgen receptor binding sites. Additional mechanisms include: inhibition of cyclooxygenase and 5-lipoxygenase (anti-inflammatory in prostate tissue), induction of apoptosis in prostate epithelial cells, and relaxation of bladder smooth muscle via alpha-1 adrenergic receptor antagonism.

Standard Dosing

320mg daily (standardized to 85-95% fatty acids and sterols)

Timing

With food (fat-soluble lipophilic extract). Morning or evening.

Cycle Duration

Minimum 3 months to assess response; ongoing for maintenance

Side Effects

• Mild GI discomfort
• Headache
• Dizziness
• Rare: erectile dysfunction (DHT reduction)
• Rare: liver injury (case reports)

Contraindications

• Pregnancy (anti-androgenic — teratogenic potential for male fetus)
• Hormone-sensitive conditions (complex hormone modulation)
• Children

Best Stacking Partners

Mechanism

Gut metabolite of ellagitannins that activates mitophagy — selective clearance of damaged mitochondria. Improves mitochondrial function, muscle endurance, and cellular energy production. Only ~40% of population can produce it endogenously.

Contraindications

• Limited long-term safety data beyond 4 months