Herbal Supplements for ED With Little Evidence

Herbal Supplements for Erectile Dysfunction With Little Evidence: What Works Instead?

Published: 17 October 2026

Many herbal supplements for erectile dysfunction with little evidence are widely marketed online, but they lack the rigorous clinical trials and regulatory approval required of licensed medicines. While some men turn to products containing ingredients like ginseng, horny goat weed, or L-arginine, these supplements are not proven to be effective or safe for treating ED. In contrast, prescription PDE5 inhibitors such as sildenafil (Viagra) and tadalafil (Cialis) have been extensively studied and are the recommended first-line treatments for erectile dysfunction in the UK [1][2].

Why Herbal Supplements for Erectile Dysfunction Have Little Evidence

Herbal supplements marketed for erectile dysfunction are not subject to the same rigorous testing as prescription medicines. In the UK, licensed medicines must undergo randomised controlled trials to prove they are effective and safe before they can be approved by the Medicines and Healthcare products Regulatory Agency (MHRA). Most herbal supplements have not been through this process, so there is little reliable evidence that they work [1].

Some herbal products have been found to contain undeclared prescription ingredients, including sildenafil or tadalafil, which can be dangerous if you are taking other medicines such as nitrates for angina. Others may contain contaminants or vary widely in strength from batch to batch. Because these products are not regulated as medicines, you cannot be sure what you are taking or whether it is safe [2].

If you are experiencing erectile dysfunction, it is important to speak to a healthcare professional rather than relying on unproven supplements. ED can be an early warning sign of underlying health conditions such as diabetes or heart disease, so a proper assessment is essential [1].

What Causes Erectile Dysfunction and Why It Matters

Erectile dysfunction is the persistent inability to achieve or maintain an erection sufficient for satisfactory sexual activity. It is very common, affecting around half of men aged 40–70 to some degree [10]. ED can have physical causes, psychological causes, or a combination of both. Physical causes include cardiovascular disease, diabetes, high blood pressure, high cholesterol, obesity, hormonal imbalances, and certain medications [1][2].

Psychological factors such as stress, anxiety, depression, and relationship difficulties can also contribute to ED. Lifestyle factors including smoking, excessive alcohol consumption, lack of physical activity, and poor diet play a significant role. Because ED can be an early sign of cardiovascular disease, it is important to see your GP for a full assessment, especially if you have not been diagnosed with ED before [1].

Treating the underlying cause—whether that means better control of diabetes, stopping smoking, losing weight, or addressing mental health concerns—can often improve erectile function. Your GP can also check whether any medicines you are taking might be contributing to the problem and suggest alternatives if appropriate [2].

When to See Your GP

You should see your GP if you are experiencing persistent erectile difficulties, especially if this is a new problem or if you have other symptoms such as chest pain, shortness of breath, or fatigue. Your GP will take a medical history, check your blood pressure, and may arrange blood tests to look for diabetes, cholesterol levels, and hormone imbalances. This assessment is important because ED can be an early warning sign of heart disease [1][2].

Proven, Licensed Treatments for Erectile Dysfunction

The first-line treatment for erectile dysfunction in the UK is a group of prescription medicines called PDE5 inhibitors. These include sildenafil (Viagra), tadalafil (Cialis), vardenafil (Levitra), and avanafil (Spedra). All four have been extensively studied in clinical trials and are proven to help most men with ED achieve and maintain an erection when sexually stimulated [1][2][9].

Sildenafil is usually taken about one hour before sexual activity, with effects lasting around four to six hours. Tadalafil can be taken on-demand (at least 30 minutes before sex, with effects lasting up to 36 hours) or as a lower daily dose. Vardenafil works in about 25–60 minutes, and avanafil is the fastest-acting, often working within 15–30 minutes. All require sexual stimulation to work and should not be taken more than once a day [3][4][5][6].

These medicines are only available on prescription after a clinical assessment by a UK-registered prescriber. At Cured Pharmacy, you can complete a confidential online consultation, which will be reviewed by a UK prescriber to ensure the treatment is safe and suitable for you. If approved, your medicine is dispensed by our GPhC-registered pharmacy and delivered discreetly to your door.

How PDE5 Inhibitors Work

PDE5 inhibitors work by relaxing the blood vessels in the penis, allowing more blood to flow in when you are sexually aroused. They do not cause an erection on their own—sexual stimulation is still needed. By blocking the enzyme PDE5, these medicines help maintain higher levels of a chemical called cGMP, which keeps the blood vessels dilated and supports a firm erection [9].

Important Safety Information About Herbal Supplements for Erectile Dysfunction With Little Evidence

One of the biggest risks of using herbal supplements for erectile dysfunction with little evidence is that some have been found to contain hidden prescription ingredients. Testing by regulators has found products sold as 'natural' or 'herbal' that actually contain sildenafil, tadalafil, or similar drugs, sometimes in uncontrolled amounts. If you are taking medicines for heart conditions, especially nitrates (such as GTN spray or isosorbide mononitrate), this combination can cause a dangerous drop in blood pressure [1][2].

Even if a supplement does not contain hidden drugs, it may still interact with your other medicines or have side effects. Because these products are not regulated as medicines, there is no guarantee of quality, purity, or consistency. Some may be contaminated with heavy metals, pesticides, or other harmful substances. If you are considering any supplement, always tell your GP or pharmacist what you are taking [2].

If you want to try a treatment for ED, it is much safer to use a licensed medicine that has been prescribed for you after a proper assessment. This way, a healthcare professional can check your medical history, current medicines, and any conditions that might make certain treatments unsuitable. You will also know exactly what you are taking and in what dose.

Lifestyle Changes That Can Help Erectile Dysfunction

Alongside prescription treatment, lifestyle changes can make a significant difference to erectile function. Stopping smoking is one of the most effective steps you can take, as smoking damages blood vessels and reduces blood flow to the penis. Reducing alcohol intake, maintaining a healthy weight, and eating a balanced diet rich in fruits, vegetables, whole grains, and lean protein all support cardiovascular health, which is closely linked to erectile function [1][2].

Regular physical activity—aiming for at least 150 minutes of moderate exercise per week—improves circulation, reduces stress, and can help with weight management. Exercise has been shown to improve erectile function in men with ED, particularly when combined with other healthy lifestyle changes. Managing stress and getting enough sleep are also important, as fatigue and anxiety can worsen ED [2].

If you have an underlying condition such as diabetes or high blood pressure, working with your GP to keep it well controlled can improve your symptoms. Some men also benefit from talking therapy or counselling, especially if psychological factors such as performance anxiety or relationship difficulties are contributing to the problem. Your GP can refer you to appropriate support services [1].

The Role of Diet and Exercise

A diet that supports heart health also supports erectile function. The Mediterranean diet—rich in olive oil, fish, nuts, fruits, and vegetables—has been associated with better erectile function in research studies. Regular aerobic exercise, such as brisk walking, cycling, or swimming, improves blood flow and can reduce ED symptoms. Pelvic floor exercises may also help some men by strengthening the muscles involved in maintaining an erection [2].

How to Access Safe, Effective ED Treatment at Cured Pharmacy

At Cured Pharmacy, we offer a straightforward, confidential way to access prescription ED treatments without the need for a face-to-face appointment. You start by completing a short online consultation, which asks about your medical history, current medicines, and any health conditions. This consultation is reviewed by a UK-registered prescriber, who will assess whether a PDE5 inhibitor is safe and suitable for you [2].

If your consultation is approved, you can choose from a range of licensed treatments including sildenafil (generic Viagra) from £0.45 per tablet, tadalafil (generic Cialis) from £7.95, vardenafil (generic Levitra) at £16.95, and avanafil (Spedra) at £20.95. We also stock branded Viagra and Cialis, as well as Teva-branded generics. First-time customers can use the code Ednew for a discount on their first order. Your medicine is dispensed by our GPhC-registered pharmacy and delivered discreetly in plain, unmarked packaging.

If the prescriber feels that a PDE5 inhibitor is not suitable for you—for example, if you are taking nitrates or have certain heart conditions—they will explain why and may suggest you see your GP for further assessment. Our service is designed to be safe, convenient, and supportive, with pharmacist advice available if you have any questions about your treatment.

Scientific References

1. NHS. (n.d.). Erectile dysfunction (impotence). NHS website. https://www.nhs.uk/conditions/erection-problems-erectile-dysfunction/ [accessed 17 October 2026]
2. National Institute for Health and Care Excellence. (n.d.). Erectile dysfunction. Clinical Knowledge Summaries. https://cks.nice.org.uk/topics/erectile-dysfunction/ [accessed 17 October 2026]
3. Joint Formulary Committee. (n.d.). Sildenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/sildenafil/ [accessed 17 October 2026]
4. Joint Formulary Committee. (n.d.). Tadalafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/tadalafil/ [accessed 17 October 2026]
5. Joint Formulary Committee. (n.d.). Vardenafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/vardenafil/ [accessed 17 October 2026]
6. Joint Formulary Committee. (n.d.). Avanafil. British National Formulary. NICE. https://bnf.nice.org.uk/drugs/avanafil/ [accessed 17 October 2026]
7. Goldstein, I., Lue, T. F., Padma-Nathan, H., Rosen, R. C., Steers, W. D., & Wicker, P. A. (1998). Oral sildenafil in the treatment of erectile dysfunction. New England Journal of Medicine, 338(20), 1397–1404. https://pubmed.ncbi.nlm.nih.gov/9580646/ [accessed 17 October 2026]
8. Feldman, H. A., Goldstein, I., Hatzichristou, D. G., Krane, R. J., & McKinlay, J. B. (1994). Impotence and its medical and psychosocial correlates: Results of the Massachusetts Male Aging Study. Journal of Urology, 151(1), 54–61. https://pubmed.ncbi.nlm.nih.gov/8254833/ [accessed 17 October 2026]

Information on this page is for educational purposes only and is not medical advice. Prescription treatments require clinical assessment by a UK-registered prescriber. Always consult a qualified healthcare professional before starting or changing any medication.

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