Nattokinase vs Saw Palmetto (Serenoa repens)

Mechanism

Nattokinase is a fibrinolytic serine protease extracted from natto (fermented soybeans). It directly degrades fibrin (the structural protein of blood clots) through four mechanisms: direct fibrinolysis, enhancement of endogenous tPA (tissue plasminogen activator) production, conversion of prourokinase to urokinase, and degradation of PAI-1 (plasminogen activator inhibitor-1). It also reduces blood viscosity and may inhibit ACE (angiotensin-converting enzyme), providing mild antihypertensive effects.

Standard Dosing

2000-4000 FU (fibrinolytic units) daily, equivalent to 100-200mg

Timing

On empty stomach, between meals or before bed. Morning and evening split dosing for 24-hour fibrinolytic coverage.

Cycle Duration

ongoing

Side Effects

• Easy bruising
• Nosebleeds
• GI upset
• Rare: serious bleeding events

Contraindications

• Active bleeding or bleeding disorders
• Scheduled surgery (discontinue 2+ weeks prior)
• Concurrent anticoagulant/antiplatelet therapy
• Hemorrhagic stroke history
• Soy allergy
• Active bleeding
• Bleeding disorders
• Pre-surgery (stop 2 weeks prior)
• Concurrent anticoagulation therapy without physician supervision

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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

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