Sexual Health for Men protocol

Sexual Health for Men

hormonesmoderate evidence

About this protocol

Male sexual function is downstream of vascular health, hormonal balance, nervous system regulation, and psychological state. Most "natural Viagra" supplements are over-marketed and under-evidenced, but a handful of compounds have real trial backing. L-citrulline is the most-evidenced supplement for erectile function in mild-to-moderate ED — it works through the same nitric oxide pathway as PDE5 inhibitors. Panax ginseng has the second-strongest evidence and works through somewhat different mechanisms. Zinc supports testosterone synthesis when deficient. Maca has small trial evidence for libido specifically. This stack is for mild-to-moderate symptoms and for healthy men optimizing function — not a substitute for proper medical workup of new-onset erectile dysfunction, which can be an early sign of cardiovascular disease.

Where to start

Start with L-citrulline. The strongest evidence in the natural supplement category for erectile function. Take 3-6 g daily; effects build over 4-8 weeks. Particularly effective when paired with proper hydration and cardio.

Add panax ginseng (Korean red ginseng). The second-most-evidenced compound. Works through dopaminergic and direct nitric-oxide-modulating mechanisms.

Add zinc if your dietary intake is low or your serum testosterone is borderline. Don''t mega-dose — 15-30 mg is sufficient for most men.

Add maca if libido (desire) rather than function (erection) is your primary concern. Trial evidence is specifically for sexual desire, not erection mechanics.

Tongkat ali is the most speculative — small trials show benefit on testosterone and sexual function but the literature needs replication. Worth a 12-week structured trial.

If you have new-onset erectile dysfunction — see a urologist or your primary care doctor. ED can be an early sign of cardiovascular disease, diabetes, or low testosterone, and these are all addressable when caught early. Don''t self-supplement past a workup.

5 nutrients

Start here

Strongest evidence — the foundation of the stack.

L-Citrulline

3-6 g daily, on an empty stomach (or 1-2 hours before activity for acute use)
morningempty stomach

L-citrulline is converted to L-arginine in the kidneys, where it serves as a substrate for nitric oxide synthesis — the same mechanism PDE5 inhibitors target indirectly. Citrulline has better bioavailability than arginine itself. Trials in mild-to-moderate erectile dysfunction show improvements in hardness scores over 4-8 weeks. Pure L-citrulline is more cost-effective than citrulline malate for this use case.[1, 2, 3]

Panax Ginseng (Korean Red)

900 mg standardized extract three times daily
morningwith food

Korean red ginseng has the second-strongest evidence base in the natural sexual-health category. Multiple randomized trials show improvements in erectile function scores, libido, and sexual satisfaction over 8-12 weeks. Mechanism involves nitric-oxide modulation plus dopaminergic effects. Choose a standardized extract.[4, 5, 6]

Add if needed

Add these only if the foundation isn't enough.

Zinc

15-30 mg elemental, with breakfast
morningwith food

Zinc is required for testosterone synthesis. Severe zinc deficiency demonstrably suppresses testosterone in human studies. In replete men, additional supplementation does not raise testosterone further — this is a deficiency-correction nutrient. Picolinate and bisglycinate forms are well-absorbed. Do not exceed 40 mg/day for extended periods.[7, 8, 9]

Maca (Lepidium meyenii)

1.5-3 g powder daily, with breakfast
morningwith food

Maca has small but consistent trial evidence for improving sexual desire and libido — distinct from erection mechanics, which is the citrulline + ginseng wheelhouse. Effect is independent of testosterone levels (maca does not raise testosterone). Useful when desire rather than function is the primary concern.[10, 11, 12]

Experimental

Emerging evidence — try last, only if curious.

Tongkat Ali (Eurycoma longifolia)

200-400 mg standardized extract daily
morningwith food

Tongkat ali has emerging trial evidence for improvements in testosterone levels, sexual function, and stress markers — particularly in men with low-normal baseline testosterone. The literature is dominated by smaller Southeast Asian trials and needs broader replication. Treat as the most speculative item — worth a 12-week structured trial with measurable endpoints.[13, 14, 15]

Warnings

Do not take with: PDE5 inhibitors (Viagra/sildenafil, Cialis/tadalafil) — generally no major interactions but citrulline may amplify the vasodilation effect; introduce supplements one at a time. Nitroglycerin or other nitrates — DO NOT combine with high-dose citrulline. Anticoagulants (panax ginseng may have mild anti-platelet effects). MAOIs and antidepressants — panax ginseng has some stimulant activity. Antihypertensives — citrulline can lower blood pressure modestly. Discuss with your prescriber.
Do not take if: You are taking nitrates or nitroglycerin (severe hypotension risk with citrulline). You have a known hormone-sensitive cancer history. You have hypertension that is being actively managed (citrulline can lower blood pressure modestly). You have bipolar disorder (panax ginseng can be stimulating). You are taking testosterone replacement therapy (this stack is generally redundant; discuss with your prescriber). You have new-onset erectile dysfunction without prior medical workup — please see your doctor first; ED can be an early sign of cardiovascular or metabolic disease.

Lifestyle improvements

Cardiovascular health is sexual health

Erectile function is downstream of vascular health. The same factors that damage arteries — high blood pressure, high LDL/ApoB, smoking, diabetes, sedentary lifestyle — damage the smaller arteries of the penis first. ED is often an early warning sign of cardiovascular disease. Address the upstream causes; everything downstream improves.

Cardio + strength

30-45 minutes of zone 2 cardio 3-4× per week plus 2-3 strength sessions has effect sizes on erectile function comparable to many supplements. The combination matters more than either alone.

Sleep 7-9 hours

Testosterone is produced primarily during REM sleep. Chronic short sleep (under 6 hours) suppresses testosterone by 10-15% within a single week. Sleep is the highest-leverage hormonal lever available.

Body composition matters

Excess adipose tissue increases aromatase activity (testosterone → estrogen conversion). Losing 5-10% body weight in overweight men reliably raises testosterone and improves erectile function.

Limit alcohol

Acute alcohol is a vasodilator but chronic moderate-to-heavy alcohol use suppresses testosterone and damages vascular function. 1-2 drinks max, not daily.

Manage chronic stress

Cortisol and testosterone share precursor pathways and are inversely correlated. Chronic work, financial, or relationship stress directly suppresses sexual function. Address the source.

Psychological factors

Anxiety, depression, relationship dynamics, and pornography habituation can produce or amplify functional symptoms. A urologist + therapist combination has better outcomes than either alone for most cases.

Annual labs

Track total + free testosterone, SHBG, estradiol, LH, FSH, lipid panel, ApoB, HbA1c, and morning cortisol. Lab work tells you whether the stack is moving anything. Symptoms alone are a poor proxy.

References

  1. L-Citrulline — supplement research overviewExamine.com link
  2. Cormio L, et al. Oral L-citrulline supplementation improves erection hardness in men with mild erectile dysfunction. Urology. 2011;77(1):119-122.PubMed link
  3. Lauer T, et al. Oral L-citrulline supplementation enhances the effects of L-arginine on plasma nitric oxide markers. Br J Nutr. 2008;100(2):255-261.PubMed link
  4. Panax ginseng — supplement research overviewExamine.com link
  5. Jang DJ, et al. Red ginseng for treating erectile dysfunction: a systematic review. Br J Clin Pharmacol. 2008;66(4):444-450.PubMed link
  6. Hong B, et al. A double-blind crossover study evaluating the efficacy of korean red ginseng in patients with erectile dysfunction. J Urol. 2002;168(5):2070-2073.PubMed link
  7. Zinc — supplement research overviewExamine.com link
  8. Prasad AS, et al. Zinc status and serum testosterone levels of healthy adults. Nutrition. 1996;12(5):344-348.PubMed link
  9. Fallah A, et al. Zinc is an Essential Element for Male Fertility: A Review of Zn Roles in Men''s Health. J Reprod Infertil. 2018;19(2):69-81.PubMed link
  10. Maca — supplement research overviewExamine.com link
  11. Gonzales GF, et al. Effect of Lepidium meyenii (MACA) on sexual desire and its absent relationship with serum testosterone levels in adult healthy men. Andrologia. 2002;34(6):367-372.PubMed link
  12. Shin BC, et al. Maca (L. meyenii) for improving sexual function: a systematic review. BMC Complement Altern Med. 2010;10:44.PubMed link
  13. Tongkat Ali — supplement research overviewExamine.com link
  14. Tambi MI, et al. Standardised water-soluble extract of Eurycoma longifolia, Tongkat ali, as testosterone booster for managing men with late-onset hypogonadism? Andrologia. 2012;44 Suppl 1:226-230.PubMed link
  15. Talbott SM, et al. Effect of Tongkat Ali on stress hormones and psychological mood state in moderately stressed subjects. J Int Soc Sports Nutr. 2013;10(1):28.PubMed link

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Disclaimer: These statements have not been evaluated by the FDA. This protocol is educational, not a substitute for personalized medical advice. Talk to your doctor before starting any new supplement regimen — especially if you're pregnant, breastfeeding, on medications, or managing a chronic condition. Last updated 5/20/2026.