Natural Supplements vs Prescription ED Treatment: What the Evidence Says

Prescription medicines prescribed by a doctor are the standard medical treatment for erectile dysfunction in Australia, and the research behind them is far stronger than the research behind any supplement. The best-studied supplement, Korean red ginseng, produced an improvement in erectile function that was probably too small to notice, according to a 2021 Cochrane review of nine clinical trials Lee et al, 2021. Some products sold as natural have also been found to contain hidden prescription drugs, which makes them riskier than the label suggests Therapeutic Goods Administration, 2026.

That is the short answer. The longer answer covers the evidence for each popular supplement, and how the two options are regulated and prescribed in Australia.

Why many men try supplements first

Supplements are easy to buy. There is no script to get and no conversation that might feel awkward. The marketing also leans heavily on the word natural, which many people read as meaning safe.

Neither assumption holds up well. Listed supplements in Australia are not individually tested by the regulator to confirm they work, and natural ingredients can still interact with other medicines. The research below shows why doctors keep making this point.

What the research shows for popular ED supplements

Korean red ginseng

The most-studied option. A Cochrane systematic review of nine trials covering 587 men found ginseng may improve erectile function slightly, but the effect fell below the threshold considered clinically meaningful, and the evidence was rated low certainty Lee et al, 2021. Side effects in the trials were about the same as placebo.

L-citrulline

An amino acid the body uses to make nitric oxide, which supports blood flow. In one small Italian trial, 12 of 24 men with mild erectile dysfunction returned to normal erectile function on L-citrulline, against 2 of 24 on placebo, and the authors still judged it less effective than prescription treatment Cormio et al, 2011. A 24-man study is far too small to change clinical practice.

L-arginine

Sold on the same nitric oxide logic. High-quality studies have not shown that L-arginine supplements treat erectile dysfunction, and it can cause nausea, stomach cramps and low blood pressure Medical News Today.

Yohimbe

The US National Center for Complementary and Integrative Health says there is not enough research to show yohimbe helps any condition, including erectile dysfunction. It has been associated with irregular heartbeat, blood pressure problems, heart attacks and seizures NCCIH. That risk profile is hard to justify for an unproven benefit.

Horny goat weed and ginkgo

Horny goat weed has no published human trials for erectile dysfunction; the supporting research is laboratory work in animals. Ginkgo biloba lacks solid evidence of benefit for any health condition and raises bleeding risk, a concern for anyone taking blood-thinning medicines Medical News Today.

DHEA

A hormone precursor with mixed trial results. A 2018 review found some studies suggesting benefit and others showing none, with reported side effects including fatigue, headaches, acne and irregular heartbeat Medical News Today.

The pattern across all of these is consistent. The most positive result comes from a single trial of 24 men, and the most rigorous review available found an effect too small to matter.

How prescription ED treatment works

The main prescription medicines for erectile dysfunction belong to a class called PDE5 inhibitors. Healthdirect explains that they work by relaxing blood vessels to improve blood flow to the penis, and that they do not create an erection on their own; sexual stimulation is still needed Healthdirect.

These medicines are prescription-only for a reason. They can interact with other drugs, particularly nitrate medicines used for heart conditions, and erectile dysfunction can itself point to an underlying health issue that needs attention. A doctor's assessment covers both before any script is written.

That is how it works at Menova Health too. A doctor reviews your health history in a consultation and prescribes only where clinically appropriate. Not every man is suited to medication, and responses vary between individuals.

How Australia regulates each option

Most supplements sold here are listed medicines carrying an AUST L number. The TGA does not individually evaluate listed medicines for quality, safety or efficacy before they go on sale; the company supplying the product certifies that it holds evidence for its claims Therapeutic Goods Administration, 2023.

Prescription medicines sit at the other end of the scale. They must be entered in the Australian Register of Therapeutic Goods and assessed by the TGA before they can be supplied.

The gap between those two standards shows up in enforcement. In June 2026 the TGA warned that several products sold as dietary supplements or natural formulas contained the undeclared prescription substances sildenafil, tadalafil and dapoxetine, none of which appeared on the labels Therapeutic Goods Administration, 2026. A man taking one of those products alongside heart medication would have no way of knowing he was exposed to a dangerous interaction.

If you buy supplements at all, choose AUST L products from Australian retailers. The TGA advises that unapproved products bought from unverified websites may be fake or contain harmful undisclosed ingredients.

What each approach costs

Supplements look cheap next to a private prescription, but the spend repeats every month for products that, on current evidence, offer little. There is also the hidden cost of delay if an underlying condition goes unchecked while you work through the supplement aisle.

Prescription costs depend on the medicine, the dose and the quantity, and pharmacy prices vary, so ask for the price before you fill a script. Our guide to ED treatment costs in Australia covers this in detail.

Combining supplements with prescription treatment

Combinations have barely been studied, and some carry genuine interaction risks. L-arginine can lower blood pressure, for example, and prescription ED medicines can do the same, so stacking the two without medical advice is unwise Medical News Today.

The safe route is simple. Tell your doctor about everything you take, including herbal products, and let them check for interactions before you add anything new.

The natural approach with real evidence behind it: lifestyle

Healthdirect recommends quitting smoking, regular exercise, losing excess weight and healthy eating as part of managing erectile dysfunction Healthdirect. These measures improve the blood-vessel health that erections depend on, and they treat the conditions that commonly sit behind the problem, such as diabetes and high blood pressure.

Exercise deserves particular attention, and our guide on how exercise improves erectile function covers the research. Sleep, alcohol and stress matter as well, and simple lifestyle changes can also support testosterone.

When to see a doctor

Erection problems that persist deserve a medical conversation whichever treatment interests you. Healthdirect notes that erectile dysfunction affects more than 1 in 10 men and can be an early signal of cardiovascular disease, diabetes or high blood pressure, which makes early diagnosis valuable Healthdirect.

Keep your regular GP informed even if you use a telehealth service. Online care works best alongside your usual doctor, not instead of them.

If you want a discreet starting point, Menova Health's online assessment collects your symptoms and health history. It is a screening step rather than a diagnosis. A registered doctor then reviews your answers, discusses suitable options in a consultation and prescribes only where clinically appropriate. You can read more about how we treat erectile dysfunction and what the process involves from consultation to delivery.

Frequently asked questions

Do natural supplements work for erectile dysfunction?

The evidence is weak. The best-studied supplement, Korean red ginseng, showed an improvement probably too small to notice in a 2021 Cochrane review. One small L-citrulline trial looked promising but involved only 24 men. Lifestyle changes and doctor-led treatment have far better research behind them.

Are ED supplements legal in Australia?

Yes, provided they are listed with the TGA and carry an AUST L number. Listing means the ingredients are considered low risk. It does not mean the product has been tested and shown to work. Products imported from unverified websites are a different matter and are best avoided.

Can I take supplements with prescription ED medication?

Only after discussing it with your doctor. Some supplements affect blood pressure or interact with other medicines, and most combinations have never been properly studied. Bring a list of everything you take, including herbal products, to any consultation so interactions can be checked.

Is it safe to buy ED medicines online?

Only through a registered Australian pharmacy with a valid prescription. The TGA has found counterfeit and adulterated products sold through unverified websites, some containing undeclared prescription drugs at unknown doses. If a website offers prescription medicine without asking for a script, avoid it.

Can erectile dysfunction improve without medication?

Sometimes. Where weight, inactivity, smoking, alcohol or stress is driving the problem, addressing those causes can improve erections. Because erectile dysfunction can also signal conditions such as diabetes or heart disease, see a doctor rather than waiting, even if you prefer a non-drug approach.

Which natural approach has the best evidence?

Lifestyle change rather than any capsule. Healthdirect recommends regular exercise, weight loss, quitting smoking and healthy eating as part of managing erectile dysfunction. These measures improve the blood-vessel health that erections rely on, which no supplement has been shown to do reliably.

References

• Healthdirect Australia, Erectile dysfunction
• Lee HW, Lee MS, Kim TH et al, Ginseng for Erectile Dysfunction: A Cochrane Systematic Review, World Journal of Men's Health, 2021
• Cormio L et al, Oral L-citrulline supplementation improves erection hardness in men with mild erectile dysfunction, Urology, 2011
• National Center for Complementary and Integrative Health, Yohimbe
• Therapeutic Goods Administration, Listed medicines, 2023
• Therapeutic Goods Administration, Sexual enhancement supplements found to contain undeclared prescription medicines, 2026
• Medical News Today, 11 natural remedies for erectile dysfunction