Male Sexual Dysfunction (Erectile Dysfunction) Protocol

Men's HealthModerate Evidence

supplements

Primary

Supporting

Grade A

Studies

Primary Stack

Core supplements with strongest evidence

L-CitrullineB

1.5-3g daily (or 6-8g citrulline malate)

Increases arginine and nitric oxide production, improving blood flow to erectile tissue

10 studies400 participants

Supporting Studies (1)

PMID: 21195829 - L-citrulline for mild erectile dysfunction: RCT (2011)

Panax Ginseng (Korean Red Ginseng)A

900-1800mg Korean red ginseng daily

Ginsenosides enhance nitric oxide release, improve smooth muscle relaxation, and support testosterone

↑Erections↑High-density lipoprotein (HDL)↓Low-density lipoprotein (LDL)↑Prolactin↑Testosterone

15 studies800 participants

Supporting Studies (2)

PMID: 18803972 - Korean red ginseng for erectile dysfunction: meta-analysis (2008)PMID: 28648659 - Panax ginseng for sexual function: systematic review (2017)

Supporting Stack

Additional supplements for enhanced results

Maca RootB

1.5-3g daily

Adaptogen that improves sexual desire and may enhance erectile function independent of hormones

↑Estrogen↑Follicle-Stimulating Hormone↑Libido↑Luteinizing Hormone↑Prolactin

10 studies500 participants

Supporting Studies (1)

PMID: 19260845 - Maca for sexual dysfunction: systematic review (2009)

PycnogenolB

40-120mg daily (often combined with L-arginine)

Pine bark extract that enhances endothelial nitric oxide production and blood flow

↑Erections

8 studies300 participants

Supporting Studies (1)

PMID: 12851125 - Pycnogenol plus L-arginine for erectile dysfunction (2003)

Tongkat Ali (Longjack)B

200-400mg standardized extract daily

May increase testosterone and reduce cortisol, improving libido and erectile function

8 studies400 participants

Supporting Studies (1)

PMID: 23754792 - Tongkat ali for male sexual health: review (2013)

FenugreekB

500-600mg standardized extract daily

Contains furostanolic saponins that may support testosterone and enhance libido

↑Libido↑Prolactin↑Prostate-Specific Antigen↑Testosterone

8 studies400 participants

Supporting Studies (1)

PMID: 26009750 - Fenugreek for male sexual function: RCT (2015)

ZincB

15-30mg daily (if deficient)

Essential for testosterone production; deficiency impairs sexual function

10 studies500 participants

Supporting Studies (1)

PMID: 8875519 - Zinc and testosterone in men (1996)

How This Protocol Works

Simple Explanation

Erectile dysfunction (ED) affects up to 50% of men over 40 to some degree. While it can have psychological components, ED is often a vascular issue—erections depend on adequate blood flow. In fact, ED can be an early warning sign of cardiovascular disease. This protocol supports erectile function through improving blood flow and supporting healthy testosterone levels.

IMPORTANT: ED can signal underlying cardiovascular disease, diabetes, or hormonal issues. Get evaluated by a healthcare provider before relying solely on supplements.

•L-Citrulline is converted to arginine in the body, which then produces nitric oxide (NO)—the key molecule that relaxes blood vessel walls and allows increased blood flow to the penis. Citrulline is actually more effective at raising arginine levels than taking arginine directly (which is poorly absorbed). One study found that over 50% of men with mild ED reported improvement after taking citrulline.

•Panax Ginseng (Korean Red Ginseng) is the most studied herb for ED with consistently positive results. Its ginsenosides enhance nitric oxide release in erectile tissue, relax smooth muscle, and may support testosterone. Multiple meta-analyses support its effectiveness, with improvements in erectile function scores comparable to some pharmaceutical treatments.

•Maca Root is a Peruvian plant that has been used for centuries to enhance fertility and libido. Research shows it improves sexual desire and may help erectile function, interestingly without directly affecting testosterone levels—suggesting it works through other mechanisms, possibly affecting neurotransmitters.

•Pycnogenol (pine bark extract) enhances nitric oxide production by the endothelium (blood vessel lining). Studies combining Pycnogenol with L-arginine show significant improvements in erectile function, with up to 92% of participants achieving normal erections in one trial.

•Tongkat Ali (Eurycoma longifolia) may help by supporting healthy testosterone levels and reducing stress hormones (cortisol). It's particularly useful when low testosterone or high stress contributes to dysfunction.

•Fenugreek contains compounds that may support testosterone levels and enhance libido. Studies show improvements in sexual function and satisfaction.

•Zinc is essential for testosterone production. Many men are mildly deficient, and correcting this can improve testosterone levels and sexual function. Don't exceed recommended doses long-term.

Expected timeline: Citrulline and Pycnogenol may show effects within days to weeks. Ginseng: 2-4 weeks. Maca and Tongkat Ali: 4-8 weeks for full effects. Address cardiovascular health for long-term improvement.

Clinical Perspective

Erectile dysfunction involves failure to achieve or maintain an erection sufficient for satisfactory sexual performance. Pathophysiology is primarily vascular (80%) involving endothelial dysfunction and impaired NO-cGMP signaling. Risk factors include cardiovascular disease, diabetes, hypertension, obesity, smoking, and medications (antihypertensives, SSRIs). ED is an independent predictor of cardiovascular events. This protocol targets NO-mediated vasodilation and hormonal optimization.

•L-Citrulline (B-grade): Converted to L-arginine in kidneys, then to NO via eNOS. Citrulline has better oral bioavailability than arginine for raising plasma arginine. NO activates guanylate cyclase → cGMP → smooth muscle relaxation in corpus cavernosum. RCT: 1.5g/day improved erection hardness score in 50% of men with mild ED (PMID: 21195829). May be synergistic with PDE5 inhibitors (both affect NO-cGMP pathway). 1.5-3g L-citrulline or 6-8g citrulline malate daily.

•Panax Ginseng (Korean Red Ginseng) (A-grade): Ginsenosides (Rg1, Rb1) enhance eNOS activity and NO production, relax corpus cavernosum smooth muscle, and may have anti-fatigue effects. Meta-analysis of 7 RCTs: significant improvement in IIEF scores vs placebo (PMID: 18803972). Systematic review confirms efficacy (PMID: 28648659). Red ginseng (steamed) preferred for sexual function. 900-1800mg/day. May affect anticoagulation.

•Maca (Lepidium meyenii) (B-grade): Mechanism not fully understood—does not directly affect testosterone but may influence neurotransmitters or act as adaptogen. Systematic review: improves sexual desire; mixed evidence for erectile function (PMID: 19260845). May take 4-8 weeks. 1.5-3g/day root powder or equivalent extract. Well-tolerated.

•Pycnogenol (B-grade): Proanthocyanidins stimulate eNOS expression and NO production. Often combined with L-arginine. Study: L-arginine 3g + Pycnogenol 40-120mg achieved 92.5% normal erections after 3 months (PMID: 12851125). Also has antioxidant and anti-inflammatory effects supporting endothelial health. 40-120mg/day.

•Tongkat Ali (Eurycoma longifolia) (B-grade): Contains eurypeptides and quassinoids. May increase testosterone via reduced SHBG binding and potential LH stimulation. Also reduces cortisol. Review: improvements in testosterone, libido, and erectile function in hypogonadal or stressed men (PMID: 23754792). 200-400mg standardized extract. Quality varies significantly.

•Fenugreek (B-grade): Furostanolic saponins may inhibit aromatase (reducing E2) and 5α-reductase, or increase SHBG-bound testosterone release. RCT: 600mg/day improved sexual function, orgasm frequency, and libido (PMID: 26009750). May affect blood glucose—monitor in diabetics.

•Zinc (B-grade): Essential for testosterone synthesis; deficiency causes hypogonadism. Many men have marginal deficiency. Supplementation restores testosterone in deficient individuals (PMID: 8875519). Check serum zinc; supplement if low. 15-30mg/day; avoid long-term high doses (copper depletion).

Biomarker targets: IIEF-5 score (validated ED assessment), testosterone (total, free), SHBG, prolactin, glucose/HbA1c, lipid panel, PSA (if indicated), cardiovascular risk assessment.

Protocol notes: PDE5 inhibitors (sildenafil, tadalafil) remain first-line for ED and are highly effective. Supplements may be adjunctive or for mild cases. Address underlying conditions: optimize cardiovascular health, control diabetes, stop smoking, exercise regularly, lose excess weight. Psychological factors: consider sex therapy if anxiety/performance issues. Low testosterone: may require TRT (medical decision). Avoid unregulated 'male enhancement' products (often contain hidden PDE5 inhibitors). Vacuum devices and penile injections are options for refractory cases. Tadalafil daily (2.5-5mg) also treats BPH.

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