Do Supplements Help You Last Longer, and What the Evidence Shows

No supplement is licensed in the UK to treat premature ejaculation, and none can legally claim to. Food supplements cannot be marketed as though they were licensed medicines for treating a medical condition.

That distinction matters. It explains why supplement labels use general language about sexual health or performance, while the stronger claims appear in online reviews and third-party marketing instead.

This page sets out the regulatory position, what the ingredients people ask about are actually established to do, what enforcement has found, and what the honest alternatives are. It contains no product recommendations, because there is nothing here that could responsibly be recommended.

Key things to know

• Food supplements are regulated as food, not as medicines, and there is no requirement to register one in the UK before selling it
• They are not permitted to contain medicinal ingredients, and the MHRA decides whether a product counts as medicinal
• A product presented as treating a condition becomes a medicine by that presentation, and then needs a licence it does not have
• Between 2021 and 2025 the MHRA seized around 19.5 million doses of unlicensed erectile dysfunction medicines, 4.4 million of them in 2025 alone
• It warns that unauthorised products may contain no active ingredient, the wrong dose, hidden medicines or toxic ingredients
• No regulator source reviewed for this page identifies zinc, magnesium, ashwagandha or L-arginine as a treatment for premature ejaculation
• Placebo produced a real measured improvement in the licensed medicine trials, which is exactly why personal accounts of supplements working cannot be relied on

Are Supplements Regulated in the UK?

Yes, but as food rather than as medicine, and the difference is the whole point.

Food supplements are governed by the Food Supplements (England) Regulations 2003 and equivalent legislation in Scotland, Wales and Northern Ireland, alongside general food law.

What That Regulation Requires

UK guidance states there is no general requirement to register a food supplement before placing it on the market.

That does not mean supplements are unregulated. Manufacturers, importers and retailers remain responsible for food safety, composition, labelling and advertising requirements.

What is different is that a food supplement does not go through the pre-market assessment a licensed medicine needs, demonstrating its safety, quality and effectiveness for a specific medical use.

What They Are Not Allowed to Contain

Where a product is presented as treating a medical condition, or where its ingredients and intended use meet the legal definition of a medicinal product, the MHRA can determine that it should be regulated as a medicine.

That turns the presence of a working ingredient into a legal problem rather than a selling point. A supplement containing something with a genuine pharmacological effect is not a better supplement. It is an unlicensed medicine.

The Claim Trap, and Why It Explains the Market

A product can fall within the definition of a medicinal product because of how it is presented, even when it is sold in a form that looks like an ordinary supplement.

The Two Limbs of the Definition

By presentation: any substance, or combination of substances, presented as having properties of preventing or treating disease.

By function: any substance, or combination of substances, that may be used to restore, correct or modify a physiological function by pharmacological, immunological or metabolic action.

What Claims Are Permitted

Nutrition and health claims must comply with the relevant regulation, meaning only authorised claims from the Great Britain nutrition and health claims register may be used.

That register is why claims are worded in that particular flat way. Anything outside it is not permitted, and treating a named condition is well outside it.

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What Enforcement Keeps Finding Inside These Products

This is where the regulatory question stops being administrative.

Between 2021 and 2025 the MHRA seized approximately 19.5 million doses of unlicensed erectile dysfunction medicines, 4.4 million in 2025 alone. Many were sold illegally online and contained sildenafil, tadalafil, vardenafil or avanafil.

The MHRA warns that unauthorised products may contain no active ingredient, the wrong dose, hidden medicines or toxic ingredients.

For someone buying a product marketed as natural, the problem is that they do not know what they are taking, or whether it is safe alongside their existing medicines and health conditions.

The Ingredients People Ask About

Each of these is a common search, and each gets the same treatment: what it is, and what regulator sources establish about it for this condition.

Zinc

Zinc is an essential mineral and a permitted supplement ingredient. No regulator source reviewed for this page identifies it as a treatment for premature ejaculation or for ejaculation control.

Zinc supplementation has established uses in documented deficiency, which is a different question, and one for a clinician rather than a shelf.

Magnesium

Magnesium is an essential mineral available in supplements. No regulator source reviewed identifies it as a treatment for premature ejaculation.

That magnesium is involved in normal muscle and nerve function does not establish that taking a supplement improves ejaculatory control.

Ashwagandha

Ashwagandha is a herbal ingredient. No regulator source reviewed identifies it as a treatment for premature ejaculation.

Herbal ingredients raise a question minerals do not. A herbal product with a genuine pharmacological action can be classified as a medicine by function, and herbal preparations can interact with prescribed medicines. Anyone taking one should tell their prescriber, whatever they are taking it for.

L-arginine

L-arginine is an amino acid. MHRA guidance notes that supplements containing familiar substances such as vitamins, amino acids or minerals are generally subject to food safety and labelling law rather than medicines control, unless they are presented for medicinal uses.

No regulator source reviewed identifies L-arginine as a treatment for premature ejaculation. The claims made for it usually concern blood flow, which is relevant to erectile function rather than ejaculation control, and those are separate conditions with separate treatments.

Why Personal Accounts Are Unusually Unreliable Here

Reviews and discussion threads are what most people rely on for supplements, and this is one of the conditions where that evidence fails most badly.

The Placebo Problem, With Numbers

In trials of licensed treatments, participants on placebo showed measurable improvements in ejaculation time. In the tablet trials, the placebo group's mean measured time rose from 0.9 minutes to 1.9 minutes. In the topical spray trials, it rose from 0.56 minutes to 0.94 minutes.

That does not mean the improvement was imaginary. It shows why changes reported by people taking an unproven product cannot automatically be credited to the product.

The Other Explanation for a Supplement That Works

If a supplement produces a strong, unmistakable, reliable effect, one explanation is that it contains an undeclared prescription ingredient.

That is not theoretical. It is what the seizure figures above describe. A product that works dramatically is a reason for suspicion rather than confidence.

Supplements Compared With Licensed Treatment

What Actually Helps, Without a Supplement

Approaches That Do Not Involve a Medicine

NICE records demonstrated benefit for various behavioural techniques, which are indicated for men uncomfortable with medicine. The same guidance describes them as time-intensive, dependent on a partner's support, and difficult to do. Counselling and education are also recorded among the beneficial non-medicine approaches.

The Two Things Guidance Says to Deal With First

Where erectile difficulty is present, guidance says it should be treated before or at the same time. Infection such as prostatitis is named alongside it.

Both are treatable, both are checkable, and neither is addressed by a supplement. Working through a shelf of capsules while one of those sits unexamined is solving the wrong problem.

Getting a Straight Answer About Your Own Situation

An assessment establishes what is actually going on, which is the step supplements are usually bought to avoid.

It covers when the difficulty started and whether there was a settled period beforehand, whether erectile function has changed, urinary or prostate symptoms, every current medicine, any supplement you take, heart history including any fainting, and mental health history.

Mention supplements honestly. Herbal preparations in particular can interact with prescribed medicines, and a prescriber cannot check for something they have not been told about.

The Claims This Page Is Careful Not to Make

• No supplement is described here as ineffective in the sense of having been tested and failed. The position is that no regulator source establishes any of them for this use, which is a different and more accurate statement
• No dosing information for any supplement or medicine appears here
• No supplement product is named, recommended or ranked, because none could responsibly be
• No individual result is predicted. Results vary between individuals

Medical Disclaimer

This page provides general information about the regulatory status of supplements marketed for sexual performance. It is not a diagnosis, and does not provide treatment or dosing advice. Treatment suitability depends on an individual clinical assessment.

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