When evaluating a treatment for Erectile Dysfunction, there are three important considerations:
- Is it the right treatment for the cause of your ED?
- Is it an effective treatment?
- Is it safe?
Choosing the Right Treatment
There are many different causes for ED, and you can’t choose an effective treatment without understanding your specific problem. To understand how different conditions can affect erections, see our articles, “How Do Erections Work?” and “Causes of Erectile Dysfunction.”
If you intend to try herbal supplements, you should first consult a doctor to understand the underlying cause. This is especially important, because sometimes ED is based on a serious underlying medical condition.
Once you know the cause of your ED, you need to evaluate the effectiveness of the treatments you are considering.
Many herbal supplements are promoted as miracle drugs. If there are claims that a supplement will do everything from curing baldness to preventing heart disease, it’s very likely that the claims are bogus.
There have been some clinical trials of herbal supplements used to treat erectile dysfunction, and in general the results are not impressive. Some supplements have shown small improvements, mostly in men with minor ED. The results are much less significant than those obtained from prescription medications.
A study1 conducted by the ED Treatment Information Center in 2018 found that 81% of the men who had tried herbal supplements were either Not at All Satisfied or Not Very Satisfied with the results. 18% were Somewhat Satisfied, and only 1% were Very Satisfied.
Also note that herbal supplements will not cure ED. In order to be effective, even for very mild cases, you will need to take them on a daily basis.
When a doctor prescribes a drug, he makes sure that it won’t cause complications for any medical conditions you have. He also checks it against the other medications you take, to be sure there aren’t dangerous effects when the drugs are combined. When you use herbal supplements, you don’t have these safeguards.
Several of the supplements used to treat ED actually have side effects that, in some cases, can be severe.
Most importantly, herbal supplements are not well regulated in the United States. Studies have shown that 40-50% of herbal supplements do not even contain the supposed main ingredient, and many contain substances that are not listed which may have dangerous side effects2.
In recent years, the FDA has found over 300 herbal products that contain hidden, deceptively labeled, or dangerous ingredients3.
No matter how you look at it, using herbal supplements is a risky proposition.
Note that the clinical studies referenced below are based on the use of tested, pharmaceutical grade supplements in controlled dosages. Supplements purchased over-the-counter may not yield the same results.
Effectiveness: No evidence of effectiveness in humans. Increases levels of estrogen, and may lower levels of testosterone.
Risks: Appears to be safe at low levels. May cause acne.
Effectiveness: Reputed to increase levels of dopamine and nitric oxide (NO). No evidence of effectiveness for ED in humans.
Risks: May reduce clotting and increase risk of bleeding.
Ginseng (Korean Red Ginseng)
Effectiveness: Stimulates blood flow into the penis by increasing nitric oxide (NO).
Risks: A small number of patients experience stomach upset, constipation, headache or insomnia.
Horny Goat Weed (epimedium)
Effectiveness: No evidence of effectiveness for ED in humans. Although it is reputed to increase levels of nitric oxide (NO), very little actually makes it into the bloodstream.
Risks: May effect heart function. May cause mood changes.
Effectiveness: Reputed to stimulate blood flow into the penis by increasing nitric oxide (NO). The NO produced by L-Arginine is metabolized in the digestive tract; there is no evidence that improves erectile function6.
Risks: Side effects may include nausea, cramps and diarrhea, as well as heart arrhythmia.
Effectiveness: In a small clinical study of 24 men with mild erectile dysfunction9, about half the subjects showed improvement. Researchers concluded that L-Citrulline is more effective than L-Arginine for mild cases of ED, but less effective than PDE5 inhibitors (Viagra, Cialis, Levitra, etc.)
Risks: L-Citrulline may cause harmful interactions with nitrates for heart disease, blood pressure medications, and PDE5 inhibitors. Consult your doctor before taking L-Citrulline.
Effectiveness: There is some evidence that Maca Root may increase sexual desire or erectile function.10
Risks: Side effects may include mild stomach upset, cramps, and mood swings.
Effectiveness: Pharmaceutical-grade Nattokinase (NK) has been used in Japan for the treatment of cardiovascular disease11. There is no clinical evidence that it is an effective treatment for ED.
Risks: Nattokinase is a blood thinner which may make bleeding disorders worse. It can also increase the risks of surgery. It is generally safe in small dosages.
Pycnogenol (Pine Bark)
Effectiveness: Stimulates blood flow into the penis by increasing nitric oxide (NO)12. May be effective in the treatment of ED when used in combination with L-Arginine (see above).
Risks: Safe in small dosages.
Effectiveness: In an animal-based clinical test, Tribulus was not effective in treating ED13. There is no clinical evidence that it is an effective treatment for ED.
Risks: Might decrease blood sugar levels to dangerous levels for diabetics. Otherwise, probably safe in small dosages.
Effectiveness: There is some evidence that a shortage of certain vitamins (notable B3, C, and D) may be linked to erectile dysfunction. For men with deficiencies, taking vitamin supplements may improve erections. However, vitamins have no effect unless there is a deficiency.
Risks: Safe if taken in recommended dosage.
Effectiveness: Stimulates blood flow into the penis by increasing nitric oxide (NO)14. May also increase libido, but the mechanism is not understood.
Risks: Side effects include increased blood pressure, fast or irregular heartbeat, anxiety, insomnia. May interact with blood pressure medications or anti-depressants. May cause kidney damage. Yohimbe shouldn’t be used without a doctor’s supervision.
Effectiveness: A zinc deficiency can lower testosterone. For men with a zinc deficiency, taking zinc supplements can raise testosterone, increase the libido, and improve erections. However, zinc has no effect unless there is a deficiency.
Risks: Safe if taken in recommended dosage. Ingesting levels of zinc in excess of the recommended dietary amount can result in diarrhea, vomiting, and stomach cramps.
There are a many supplements on the market that do not disclose their specific ingredients. It’s impossible to evaluate the effectiveness and safety of these products, and we strongly advise not purchasing them.
For More Information
- Nicholson, Robert T. “Comprehensive Study on the Impact of Erectile Dysfunction.” ED Treatment Information Center, 21 Mar. 2018, edtreatment.info/ed-impact-study/.
- Newmaster, Steven G.; Grguric, Meghan; Shanmughanandhan, Dhivya; Ramalingam, Sathishkumar; and Ragupathy, Subramanyam. “DNA Barcoding Detects Contamination and Substitution in North American Herbal Products.” BMC Medicine. 11/2013:222.
- US Food & Drug Administration (FDA). “Beware of Fraudulent Dietary Supplements.” 15 Mar 2011. <https://www.fda.gov/forconsumers/consumerupdates/ucm246744.htm>
- Spitz, Aaron. The Penis Book. Rodale Wellness, 2018.
- Mayo Clinic Staff. “Dietary supplements for erectile dysfunction: A natural treatment for ED?” Mayo Foundation for Medical Education and Research, 17 Jan 2016. <https://www.mayoclinic.org/diseases-conditions/erectile-dysfunction/in-depth/erectile-dysfunction-herbs/art-20044394>
- Klotz, T; Mathers, MJ; Braun, M; Bloch, W; Engelmann, U. “Effectiveness of oral L-arginine in first-line treatment of erectile dysfunction in a controlled crossover study.” Urology International. 1999;63(4):220-3.
- Stanislavov, R.; Nikolova, V. “Treatment of erectile dysfunction with pycnogenol and L-arginine.” Journal of Sex & Marital Therapy. May-Jun 2003:207-13.
- Spitz, Aaron. The Penis Book. Rodale Wellness, 2018.
- Cormio, L; De Siati, M; Lorusso, F; Selvaggio, O; Mirabella, L; Sanguedolce, F; Carrieri, G. “Oral L-citrulline supplementation improves erection hardness in men with mild erectile dysfunction.” Urology. Jan 2011;77(1):119-22
- Shin, Byung-Cheul ; Lee, Myeong Soo; Yang,Eun Jin; Lim, Hyun-Suk, and Ernst, Edzard. “Maca (L. meyenii) for Improving Sexual Function: a Systematic Review.” BMC Complementary and Alternative Medicine. Aug 2010. <https://bmccomplementalternmed.biomedcentral.com/articles/10.1186/1472-6882-10-44>
- Weng, Yunqi; Yao, Jian; Sparks, Sawyer; Wang, Kevin Yueju. “Nattokinase: An Oral Antithrombotic Agent for the Prevention of Cardiovascular Disease.” International Journal of Molecular Science. Mar 2017; 18(3): 523.
- Rohdewad, P. “A Review of the French Maritime Pine Bark Extract (Pycnogenol), and Herbal Medication with a Diverse Clinical Pharmacology.” International Journal of Clinical Pharmacology and Therapeutics. 2002: 158-68.
- Gauthaman, K1; Ganesan, A. P. “The hormonal effects of Tribulus terrestris and its role in the management of male erectile dysfunction–an evaluation using primates, rabbit and rat.” Actas Urológicas Españolas. Jan 2008;15(1-2):44-54.
- Israel, J.; Laborde, E. “Alternative and Internet Drugs that Affect Sexual Function.” Contemporary Treatment of Erectile Dysfunction. 13 Aug 2016: 137-144.