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Urologist from London was laughed at by his colleagues — until his “15-minute capsule” for erectile dysfunction worked for 9 out of 10 men in the trial. We paid him a visit.

Dr Andrew Lindley in his lab during our interview: “The problem was never the plant. The problem was getting it into the blood.”

By KATHERINE VAUGHAN, HEALTH EDITOR
Published: 15:00 · 22 Oct 2026

A urologist from London spent more than a year in his lab, almost every single day, chasing one question: why do nearly half of all men over 50 live with erectile dysfunction – and why do most of them swallow plant-based capsules for weeks on end, wait, and still end up at a GP who shrugs, or in a clinic that offers them an injection? What he finally came up with worked for 9 out of 10 men with erectile dysfunction (ED) within 15 minutes in the trial – and has no known side effects. It isn’t a pressed powder but a natural, fast-acting capsule with seven plant compounds already dissolved – so they’re absorbed almost immediately. He called it Mendorex.

When I visit Dr Andrew Lindley at his clinic in London, he doesn’t look like a man whose colleagues were still laughing at him two years ago.

He is calm, polite, almost reserved. But the moment the conversation turns to erectile dysfunction, something changes in his voice.

“For most men, impotence isn’t a medical problem – it’s a secret,” he says. “They don’t talk to anyone about it. They take maca, arginine, ginseng, swallow a capsule every day for weeks and wait. And when nothing happens, their GP tells them: that’s age for you. Both are wrong. The plants work – they just never get to where they’re supposed to work.”

THE UROLOGIST NOBODY TOOK SERIOUSLY

Lindley’s story begins at a urology conference packed with specialists from all over Europe. He was one of them – with more than twenty years’ experience in men’s health.

While the talks revolved around yet more herbal blends, Lindley stood up and asked a question that silenced the room.

“Of what a man swallows, around 15% reaches the blood – the rest passes straight through as if it had never been there,” he recalls. “Why has nobody built something that actually arrives – and does so within minutes instead of weeks?”

“They laughed,” he says. “Someone said herbal things simply take weeks, everybody knows that. So I went back to the lab.”

Just after four in the morning in Lindley’s lab: coffee, half a sandwich and the next batch of plant extracts. For more than a year, almost every night looked like this.

For over a year he worked practically every day. He stayed through the night, often until it got light.

“Our results were so far beyond anything I’d expected that I couldn’t sleep for excitement,” he says, smiling for the first time. “So I just kept working.”

WHAT REALLY HAPPENS IN ERECTILE DYSFUNCTION

Lindley explains what he found out about erectile dysfunction from behind his desk – and it’s surprisingly simple.

At its core, an erection is pure hydraulics. Blood flows into the two chambers of erectile tissue – and stays there.

An enzyme in the erectile tissue is the “drain”. It breaks down the signal that keeps the chambers full. In a young man that drain is barely open. With the years, with stress and poorer circulation, it opens wider and wider – until the chambers no longer fill properly, or don’t stay full.

Left: narrowed vessels – the blood never arrives. Right: open vessels – the chambers fill completely.

A plant compound can close exactly that drain – icariin from horny goat weed. That has been known for years. The problem, says Lindley, is the journey from the capsule into the blood:

✘ Weeks instead of minutes – a plant compound that first has to dissolve in the stomach builds up in the blood, if at all, over weeks. For the evening when it actually matters, that’s no help at all.

✘ 85% never arrives – pressed powder first has to break apart in your stomach and then dissolve. Plant extracts dissolve poorly. After a meal, even worse.

✘ 2% instead of 98% – horny goat weed naturally contains only around 2% icariin. “That isn’t enough to close the drain,” says Lindley. “You first have to extract the active compound and concentrate it.”

✘ Nothing for desire – “Icariin on its own is a plumber, not a spark,” says Lindley. “It pushes blood in the right direction – whether you’re in the mood or not. That’s why a single active ingredient isn’t enough.”

And that is exactly the point: the plant was never the problem. The way into the blood was. For twenty years, nobody bothered to build something that arrives – and does so within minutes.

IMPOTENCE AT 40: “THAT’S AGE FOR YOU” – AND WHAT COMES NEXT

I ask Lindley what happens to the men for whom months of waiting have changed nothing. He goes quiet for a moment.

“Then they go to their GP. And he shrugs and says: that’s age for you, Mr Smith. You’ll have to live with it.”

Four words – and most men go home and live with it. Studies suggest erectile dysfunction affects nearly one man in two over 50, and very few ever mention it to a doctor. Quietly. They plan less, they avoid it, they go to bed earlier than their wife. After a few years, nobody talks about it any more.

And the ones who refuse to give up get a referral. “And at the clinic,” says Lindley, “the needle is waiting.”

The injection many men are offered at the clinic: a thin needle, at a 90° angle, straight into the erectile tissue – every single time, shortly beforehand.

A thin needle, straight into the penis, at a 90-degree angle. Not once, but every single time, shortly before it’s supposed to happen. With the risk of scar tissue forming exactly there.

And if that isn’t enough, many clinics move on to testosterone injections. A jab in the thigh every two weeks – while your own production gradually shuts down.

Testosterone injections – the next step many private clinics offer. A jab every fortnight, regular blood tests, and your own production switches off.

“Most men would rather give up on intimacy altogether than be disappointed one more time,” says Lindley. “And a lot of them do – quietly, without telling anyone. That’s what I couldn’t accept. The choice shouldn’t be: give up, or the needle.”

WHAT HAPPENS WHEN MEN WITH ERECTILE DYSFUNCTION WAIT

What very few men know – and what Lindley explains first to every patient with erectile dysfunction: erectile tissue is muscle tissue. And muscle tissue that isn’t used wastes away.

Every erection – including the night-time ones men never notice – pumps oxygen-rich blood through the tissue and keeps it soft and elastic. When erections stop for months, the tissue gets too little oxygen. It hardens. Urologists call it fibrosis: instead of the elastic, sponge-like structure, scar tissue forms – and scar tissue can no longer fill.

Left: healthy erectile tissue – elastic, well supplied with blood. Right: scarred tissue after months without an erection – it no longer fills completely.

“That’s the part ‘that’s age for you’ leaves out,” says Lindley. “Every month a man waits makes it harder. Not because he’s getting older – but because the tissue is scarring. That’s why waiting is the worst of all the options.”

IMPORTANT: scar tissue in the erectile chambers can hardly be reversed. What can be preserved is the tissue that is still healthy – through regular, full erections. That is exactly why urologists advise: don’t wait.

THE BREAKTHROUGH: A CAPSULE THAT ARRIVES IN 15 MINUTES

Lindley’s solution came from two directions at once.

First, the active ingredient. In the lab, Lindley tested more than 200 plant compounds for one single property: how firmly they close the drain in the erectile tissue – and only there.

One stood head and shoulders above the rest. Horny goat weed – a plant Chinese physicians have used for 2,000 years. Its active compound icariin – naturally present in the plant at only around 2%, refined by Lindley to 98% purity – closed the drain in the erectile tissue like none of the other 200 compounds, and left the rest of the body alone. Strong where it needs to be. Nothing where it doesn’t.

But Lindley didn’t stop at one plant. “An erection needs three things,” he says. “Desire has to start in the head. The blood has to flow in. And it has to stay there. Miss one and the whole thing falls apart.” So he built the formula around all three – with six more plant compounds, each one chosen because it does a job the others can’t:

Velvet bean (Mucuna)
Velvet bean (Mucuna)
Tongkat Ali
Tongkat Ali
Shilajit
Shilajit
Horny goat weed
Horny goat weed
Red Kwao Krua
Red Kwao Krua
Ashwagandha
Ashwagandha
Pine bark
Pine bark

The seven plant compounds in every Mendorex capsule.

Desire · Velvet bean + Tongkat Ali + Shilajit
Switches desire back on
Velvet bean (Mucuna pruriens) is one of the richest natural sources of L-dopa – the building block of dopamine, the “I want to” signal in the brain. Tongkat Ali, the Malaysian root everyone in men’s health is talking about right now, works on the testosterone signal behind desire. And shilajit – the black resin that seeps out of Himalayan rock, formed over centuries from compressed mountain plants – is what men in the Himalayas have taken for strength and stamina for generations; in a clinical trial it raised men’s testosterone levels significantly. Together they do what mechanics alone can’t: make you actually want to.
Firmness · Horny goat weed + Red Kwao Krua
Firmer, faster
Mendorex uses horny goat weed at pharmaceutical purity: 98% pure icariin – the plant itself contains only around 2%. It closes the drain – but only in the erectile tissue, not throughout the body. Red Kwao Krua (Butea superba), the blood-red Thai root that Thai herbalists only hand out in precisely measured doses, reinforces it from a second direction. Two plants, one goal – and because both are already dissolved in the capsule, it works in about 15 minutes instead of weeks.
Staying power · Ashwagandha (KSM-66) + Pine bark
A window of up to 24 hours
Ashwagandha, currently the best-researched root in men’s health, lowers cortisol – the stress hormone behind performance anxiety and “losing it” halfway through. French pine bark keeps the vessels open for hours. One capsule on Friday evening – and the window is still open on Saturday. No new timing. No second capsule.

The strength of Mendorex lies in the combination: a plant compound that closes the drain only where it needs closing, plus the compounds that bring desire back and keep the window open.

WHY 85% NEVER ARRIVES – AND HOW LINDLEY SOLVED IT

Then the delivery. This is the part that took a year – and Lindley found the answer not in urology but in painkillers. A pressed powder first has to break apart in your stomach and then dissolve before your body can do anything with it. Plant extracts dissolve poorly, especially after a meal – which is why around 85% of a dry, pressed plant extract never reaches your bloodstream, and you wait weeks for the rest.

“Anyone who’s ever had a headache knows the difference,” he explains. “A normal tablet takes three-quarters of an hour. A liquid capsule with the ingredient already dissolved works within a quarter of an hour. Same ingredient, different packaging. With painkillers we’ve known that for twenty years. In men’s health, nobody had bothered to try it.”

Lindley pre-dissolved his ingredients in microscopic droplets – known as a micro-emulsion. The capsule opens within a few minutes, and whatever is released doesn’t have to break down or dissolve. It’s absorbed straight away – even after a full meal.

The maths is simple: whatever is already dissolved inside the capsule doesn’t have to break apart or dissolve in your stomach. Almost 100% of the active ingredient reaches the blood – and in 15 minutes, not weeks.

The result, per capsule: seven plant compounds, including icariin at 98% purity, already dissolved – so almost all of it reaches the blood. Within 15 minutes, and without flooding the whole body.

He called it Mendorex.

Using it couldn’t be simpler: one capsule with a sip of water, about 15 minutes beforehand. No daily dosing. No build-up phase. It works the very first time.

✔ Works in 15 minutes – you take it when the moment is there. Not weeks in advance.

✔ It arrives – almost 100% of the active ingredient reaches the blood, because the formula is already dissolved. Measured in the lab.

✔ No known side effects – a food supplement with seven plant compounds that only works where it’s supposed to.

✔ Works after a meal and a glass of wine – the formula is already dissolved and doesn’t need an empty stomach. Nothing to plan around dinner.

✔ A window of up to 24 hours – taken on Friday evening, still active on Saturday.

✔ Desire comes back – not just the mechanics.

THE TRIAL: 1,200 MEN WITH ERECTILE DYSFUNCTION

Before Lindley went public, he did something that is rare for a food supplement: he had Mendorex tested against a placebo – together with colleagues from the UK, Ireland, Germany and the Netherlands.

A total of 1,200 men between 35 and over 70 – all with medically confirmed erectile dysfunction, all measured at the same points in time.

Men with a fully firm erection after 15 minutes
Placebo-controlled – 1,200 participants, 35 to over 70
Mendorex ★91%
Placebo4%
More than 9 out of 10 men were fully ready after 15 minutes – on placebo, hardly any.

Share of men with a full erection 15 minutes after one capsule – measured in 1,200 participants.

Mendorex at a glance:

Mendorex
What forErection problems (erectile dysfunction)
Time to effectapprox. 15 min
Active ingredient reaching the bloodAlmost 100% – pre-dissolved (micro-emulsion)
Icariin purity (horny goat weed)98%
How long you stay readyUp to 24 hours
Works after a meal & a glass of wine✔ Yes
Effect on desire✔ Yes – velvet bean, Tongkat Ali, shilajit
Daily dosing requiredNo – only when needed
Side effects✔ None known
TypeFood supplement – seven plant compounds
✓ Check availability now

The results were unambiguous:

✔ 97% of men reported firmer, more reliable erections than in the months before.

✔ 94% reported no side effects whatsoever.

✔ Of the men who had already given up on the subject, 8 out of 10 got a full erection with Mendorex – the first time.

Independently tested in the lab – onset, firmness and tolerability were measured and documented.

“This isn’t a food supplement that hopes,” Lindley sums up. “It’s a capsule that arrives – almost completely, in 15 minutes – and we can prove it. We measured it.”

HOW MENDOREX WORKS – MINUTE BY MINUTE

0minutes
One capsule with a sip of water. At the table, over a glass of wine, when the moment is there. Nobody needs to notice.
15minutes
Fully ready. The vessels open, the drain closes, the chambers fill. Firm – and for most men noticeably firmer than they remember. Desire comes with it.
24hours
The window stays open. Once, twice, the next morning – you decide. No second dose needed.
After 
Nothing. No “morning after”. Just a very good night – and erectile tissue that is getting what keeps it healthy again.

WHAT BRITISH MEN ARE SAYING

Since Mendorex became available in the UK, thousands of men have tried it. One of them is Ray B., 57, from Leeds, married for twelve years – and for the last two, a man who had almost given up on the subject.

“For two years it got gradually worse, and I hid it from my wife. The first time with Mendorex I just took the capsule at the table, after dinner. A quarter of an hour later I was firmer than I’d been in ten years. My wife didn’t know what had hit her.” – Ray B., 57, Leeds

“At 66, I’d honestly written the whole thing off – my GP said that’s just age. After our anniversary dinner I quietly took one. Half an hour, that’s all it took. We’ve been together more than forty years and hadn’t been this close in a long time.” – Geoff H., 66, Nottingham

“My doctor was already talking about injections. I dreaded the thought. I ordered Mendorex as a last resort – and thankfully it never came to that. It works every time, within a quarter of an hour, and I haven’t noticed a single side effect. I’ve already reordered.” – Mark T., 48, Bristol

DR LINDLEY’S MESSAGE TO YOU

When I ask Lindley what he’d say to the men reading this article, he answers without hesitation.

“You don’t have to prepare your love life for weeks or plan it in advance. You don’t have to choose between giving up and a needle. And you don’t have to settle for ‘that’s age for you’. Erectile dysfunction isn’t a question of age – it’s a question of blood flow. The plants have always worked. Now there’s finally a capsule that gets them where they need to be – before the tissue is damaged.”

You have a simple choice:

1. Keep waiting – hope it gets better on its own – and watch the tissue scar a little more every month.

2. Wait until the clinic offers you the injection – every single time, shortly beforehand.

3. Try the one that arrives – one capsule, 15 minutes, up to 24 hours, no known side effects. 30-day money-back guarantee.

As a reader offer, Lindley and his team are giving readers of this article 46% off with free delivery on Mendorex – while stocks last.

Please note: Mendorex has already sold out three times this year, and the reader discount only applies to the current batch. Once it’s gone, you pay full price again. If you need it, order now.

IMPORTANT: take one capsule of Mendorex with a sip of water, about 15 minutes beforehand. No more than one capsule per 24 hours – you won’t need more anyway.

There’s no risk: you have 30 days to try Mendorex for yourself. If you’re not convinced, you get every penny back – and you keep the packs. Nothing to send back, no questions asked.

✔ Update: Mendorex has already sold out three times this year. The 46% reader discount including free delivery only applies to the current batch – while stocks last.
Mendorex
£75.50 £39.95 per pack · 46% off
✓ Yes! Show me my Mendorex offer
46% off – only while stocks last
30-day money-back guarantee Made in the United Kingdom Doctor recommended – clinically tested

Comments (167)

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Comments on this article are now closed.

Sandra Hughes2 days ago

Ordered it for my husband after years of nothing happening in our house and neither of us talking about it 😅 The very first time I could tell what a difference it was – a quarter of an hour, and he was his old self again. Thank you for this article!

38
Tom Shepherd4 days ago

My GP started talking about injections a year ago – that honestly frightened me. Tried this instead. One capsule, and a quarter of an hour later, ready to go. Hard to believe.

31
Paula Newman4 days ago

Tom, exactly the same conversation in our house – my husband flatly refused the needle. Did it really work that fast for you?

8
Tom Shepherd4 days ago

Paula, the very first time for me, after about fifteen minutes 👍 And it doesn’t matter if we’ve been out for dinner first – I’d read that with plant-based stuff an empty stomach was crucial. Apparently not here.

15
Roger Brennan3 days ago

Honest question, because I can’t find this anywhere: I’ve been on ramipril and a beta blocker for years. Is this still OK, or is it dodgy with blood pressure tablets?

24
Clive Kershaw3 days ago

Roger, same situation here (ramipril). I just showed my GP the ingredients – horny goat weed, red Kwao Krua, Tongkat Ali, velvet bean, shilajit, ashwagandha, pine bark. He had no objections. Six weeks now, as and when needed, my blood pressure hasn’t changed and my head stays clear. But ask your own doctor, it takes two minutes.

19
Claire Richards5 days ago

Just ordered a pack for my husband, curious to see. After all the comments on here I couldn’t resist 😊

17
Angela Wolfe6 days ago

9 out of 10 men, 15 minutes and no side effects? I’m always sceptical about this sort of thing. Does it actually work, or is it just more advertising? 🙄

6
Mandy Baker6 days ago

Angela, we were sceptical too – my husband even more so. He tried it anyway – and all I can say is: it works, it keeps working, and it does so when we want it to, not “eventually”. Full stop.

14
Frank Simmons1 week ago

Eight years of it getting worse, and I thought that was just part of being 63. Now I take one capsule a quarter of an hour beforehand, and that’s that. My wife keeps asking what’s got into me 😆 Used the discount, everything went through without a hitch.

35
Colin Peterson5 days ago

Before I order: is this one of those subscriptions that takes money every month? Had real trouble with that once and I’ve been wary of these online offers ever since.

13
Frank Simmons5 days ago

Colin, no. I took the 90-day pack, paid once, nothing has been taken since – the invoice came by email and was right to the penny. And if it does nothing for you, there’s 30 days to get your money back. That’s the only reason I risked it in the first place.

21
Gordon Seddon6 days ago

I’m 71. Is there any point at my age, or has that ship sailed?

11
Ron Lucas6 days ago

Gordon, I’m 74. Yes. For me it’s nearer 20 minutes than 15, but it comes – and reliably. And if I’ve understood the article right, waiting is the worst thing you can do – the tissue scars. I should have started sooner.

33
Wayne Cooper3 days ago

Can you get Mendorex at the chemist or on the high street? Or only here?

4
Mick Lane3 days ago

Wayne, no, not at the chemist. Best to order directly through the official page here, that’s where you get the discount as well.

9
Tony Fowler2 days ago

I was honestly on the verge of writing the whole thing off. The difference here really does seem to be the liquid capsule, the ingredients are already dissolved: you actually notice it after a quarter of an hour, not “eventually”. And £39.95 for 30 capsules is less than a single dinner for two.

27
Irene Wagstaff4 days ago

I’d like to order this for my husband without him knowing beforehand (anniversary surprise 😉). Does it really arrive in plain packaging? Our neighbour often takes in our parcels.

10
Tom Shepherd4 days ago

Irene, plain brown box, no product name on the outside, and none on the invoice either. Ordered Monday evening, it was here Wednesday.

12
Pete Hayden1 day ago

Question: does it really work after a meal? We eat late and we eat well, and with plant-based remedies it often says “on an empty stomach”.

7
Barry Hartley1 day ago

Pete, yes. For me it was after a three-course meal with wine, capsule taken with dessert, and less than 20 minutes later everything was there. That’s the whole point of the liquid capsule – it doesn’t have to dissolve in your stomach first.

16
Barry Hartley19 hours ago

Ordered out of curiosity, partly because of the discount – nothing to lose. I couldn’t believe a plant-based capsule could work like that in a quarter of an hour, after a year in which nothing worked at all for me. My wife and I haven’t had an evening like that in years 😍

12
✔ Update: The 46% reader discount only applies while the current batch lasts. After that the regular price applies again – free delivery included while the offer runs.
Mendorex
£75.50 £39.95 per pack · 46% off
✓ Yes! Show me my Mendorex offer
46% off – only while stocks last
30-day money-back guarantee Made in the United Kingdom Doctor recommended – clinically tested