Penis extender guide · Updated for 2026

Do Penis Extenders Work? What Studies and 5,777 Men Show

A straight answer on length, girth, how long it takes and whether the gains last. With the published studies, what urology groups say, and what thousands of men logged in our app.

Baseem Najjar

By Baseem Najjar, CEO of Epic Extender

146K subscribers on YouTube. Inventor on US Patent 11,918,505. Has tested 17 extenders. We make extenders, so read this knowing we are biased too. That is why we show data, and the studies that are not in our favor.

Baseem with the penis extenders he bought and tested, lined up on a table

The short answer

Yes, penis extenders work, for length. Published studies measured gains of about half an inch to an inch after 3 to 6 months of daily wear. In our app, 90% of men who logged 250 or more hours measured longer, and the top 10% had gained +1.02" or more by month 12. It takes months of regular wear, and the hours decide it.

What an extender does not do is add girth. That is the job of a penis pump.

90%

of men who logged 250+ hours measured longer

+1.02"

length gained by the top 10% at month 12, or more

0.5 to 0.9"

length gained in published studies

5,777

men logged training in our app

What Does a Penis Extender Do?

A penis extender, also called a penis stretcher or a traction device, holds your penis at a steady, gentle stretch for hours at a time. That is all it does, and it is why hours matter more than force.

Epic penis extender with its rods, base and cup
An extender holds the head and pulls gently forward, hour after hour.

How Does a Penis Extender Work?

Over months, the tissue adds length, the same way skin grows when it is stretched slowly. Doctors call this penile traction therapy.

Diagram of traction: a steady gentle pull on both ends, with new growth along the middle
A steady, gentle pull for hours. That is all it does.
  1. Fit. A cup holds the head, and a base rests against your body.
  2. Stretch. The rods hold the two apart with a light, steady pull.
  3. Hold. You wear it for an hour or more, with a short break every 30 minutes.
  4. Repeat. Most days, for months. Newer extenders show the exact pull on a screen, so you can start light and add more over time.

Realistic Gains From Penile StretchingUroChannel on YouTube · 8 min

In this video, a urologist says traction causes real tissue growth, and to expect 1.5 to 2 cm with daily use for about 6 months.

Ready to try one? The setup, step by step, is in how to use a penis extender.

Do Penis Extenders Really Work? It Depends on Your Goal

An extender is built for one job, and it does that job well. Here is the answer for each goal, and what it is based on.

Four goals for a penis extender shown as icons: length, gains that last, girth and fast results
An extender does the first two. It does not do the last two.
Your goalDoes an extender work?Based on
More lengthはい4 studies and our app. 90% of men with 250+ hours measured longer
Gains that lastYes, in the studies that checkedLength held for the 3 to 6 months men were followed after they stopped
More girthいいえGirth did not change in any study, or in our data. A pump is what adds girth
Fast resultsいいえThe typical man first measured a quarter inch longer at month 9
A curved penisIt has been studiedA randomized trial in men with a curve found length gains. Our products are not sold to treat it, so see a urologist first

Study numbers come from published trials. App numbers come from our free PE Trainer app. They are self-measured, not a clinical trial. Results vary.

What the Studies Found

Three studies measured men who wanted more length. A fourth, with a control group, measured men with a curved penis.

StudyWhoWorn each dayForLength gained胴回り
Gontero 2009
BJU International		Men who wanted more length. Small pilot studyAt least 4 hours6か月+2.3 cm soft, +1.7 cm stretchedNo change
Nikoobakht 2011
Journal of Sexual Medicine		Men who wanted more length. 23 men4 to 9 hours3 months+1.7 cm soft, +1.7 cm stretchedNo change
Nowroozi 2015
Journal of Sexual Medicine		Men who wanted more length. 54 men4 to 6 hours6か月+1.7 cm soft, +1.3 cm stretched, +1.2 cm erectNo change
Ziegelmann 2019
Journal of Urology, randomized		Men with a curved penis. 110 men, with a control group30 to 90 minutes3 months+1.5 cm stretched. 0 cm without the deviceNot reported

1.2 cm is about 0.47 inches and 2.3 cm is about 0.9 inches. Soft means flaccid length. The first three studies had no control group.

Length went up in every studyBetween 1.2 and 2.3 cm, depending on how it was measured.
The gain held after men stoppedIn the one study that kept measuring, length did not change in the 3 months after.
Girth did not changeNot in any of the studies.

Good to know. The studies in men without a curve are small, and most have no control group. A review that pooled trials in men with a curve found no clear length effect (Almsaoud 2023). An earlier review still called extenders "the only evidence-based technique of penile elongation" (Oderda 2011). All the studies are on our clinical studies page.

What 5,777 Men in Our App Measured

Studies are small. Our app is not. 225,802 hours logged and 14,238 men measured, all with our free PE Trainer app. Men who put the hours in did best: 90% of men with 250 or more hours measured longer, and 59% of them gained half an inch or more.

Close up of the Epic Pro digital tension screen
The Epic Pro shows your exact tension and logs your hours.

Here is erect length gain by month, for men who measured at each month.

Time on an extenderTypicalTop 25%Top 10%Men
Month 1+0.08"+0.24"+0.47"787
Month 3+0.22"+0.43"+0.63"468
Month 6+0.28"+0.55"+0.82"262
Month 9+0.35"+0.59"+0.99"150
Month 12+0.47"+0.75"+1.02"107

Bone-pressed erect length, self-measured in our PE Trainer app, not a clinical trial. Typical means the middle man. Every number, filter and chart is in the Epic Traction Report.

More Hours, More Length

The more hours men logged, the more of them measured longer.

Measured, no hours loggedtypical +0.12", 498 men59%
Under 25 hourstypical +0.12", 703 men63%
25 to 100 hourstypical +0.24", 423 men79%
100 to 250 hourstypical +0.32", 206 men82%
250+ hourstypical +0.55", 81 men90%

Share of men who measured longer than at the start, by traction hours logged. Men who logged no hours still show a small gain. That is the noise of measuring yourself, so compare the groups.

Every number, one per line, is in our penis enlargement statistics.

How Long Do Penis Extenders Take to Work?

Months, not weeks. Most men feel a change before they can measure one.

Twelve rising bars, one for each month on a penis extender, with the biggest at month twelve
Months, not weeks.
About 4 weeksWhen men in our Discord first noticed a change. It was usually erection quality or a fuller soft hang, not erect length.
Month 9When the typical man first measured a quarter inch longer. 62% of men who measured for a year got there.
Month 11When the typical man who reached half an inch got there. 42% of men who measured for a year did.

How Long Does It Take To See Results?Baseem on YouTube · 6 min

Baseem says real gains build over months, and the biggest come after a year. Plan your hours with how long to wear a penis extender.

Do Penis Extender Gains Last?

In the studies that kept measuring, yes. Small studies that followed men after they stopped found the length held for the 3 to 6 months they were followed.

A ruler with a padlock on it, next to a calendar with a check mark
In the studies that kept measuring, the length held.

That is what men tell us too. One Epic owner wrote this on Reddit.

I gained a little more than 0.5” in length so definitely noticeably bigger, and permanent as far as I can tell

Epic Pro owner, 2026 Read on Reddit

Once you reach your goal, our coaches still suggest a few short sessions a week to keep it.

Why Extenders Do Not Work for Some Men

The device is the same for everyone. What changes is how men use it.

Two jars of logged hours, one nearly empty and one full, showing that hours decide results
Same device. Different hours.
  • Hours decide it90% of men with 250+ hours measured longer, and 59% gained half an inch or more. Under 25 hours, men measured the same as men who logged nothing.
  • More days beat longer daysOnly 2.4% of men who trained 3 or more days a week lost length, against 9.5% under 1.5 days. Wearing it 90+ minutes a day did no better than 45 to 90.
  • Most men stop early52% of extender users still log training after a month, and only 21% after a year. Most men who say it did not work quit before it could.
  • Start light, build slowlyTypical Epic Pro tension rose from 1.9 kg in week 1 to 2.7 kg by week 13. Too much too soon brings blisters and forced breaks.

The Mistakes Our Coaches Fix Most

Wrong cup or sleeve size, or an air leakabout 225
Measuring the wrong wayabout 173
Too little tension for hours, with no real stretch firstabout 157
Poor tapingabout 151
Expecting fast resultsabout 95
Too few hoursabout 94

How often our coaches corrected each mistake in our Discord, counted by hand. Fit and measuring come first, so fix those before you blame the device.

Penis Enlargement, What Works and What Does NotBaseem on YouTube · 6 min

Traction works, Baseem says, and most men fail from quitting, not from the device. Set yours up right with how to use a penis extender.

What Doctors and Urology Groups Say

Traction is the non-surgical option urology guidelines name for length. Here are their own words.

An open guideline book with a bookmark and a stethoscope
Traction is the non-surgical option urology guidelines name for length.

Penile traction therapy is an effective treatment to achieve penile lengthening.

European Association of Urology, 2026 guideline. The guideline rates the evidence behind it as limited. Source

Consider the use of penile traction therapy as a conservative treatment to increase penile length.

The same guideline, advice to doctors. It is graded a weak recommendation. Source

Penile traction therapy can be offered to achieve penile lengthening ... (average 2 cm after a minimum of 3 months of daily traction).

International Consultation on Sexual Medicine, 2024. Source

Structured counseling should be always performed, with extenders eventually used by those still seeking enhancement. Injectables and surgery should remain a last option, considered unethical outside of clinical trials.

A review by size-anxiety experts, 2020. Source

Not everyone agrees. A patient page from the International Society for Sexual Medicine says traction is ineffective for enlargement (source). No large US urology group has taken a position on extenders for size.

Scientifically Proven Ways to Increase Penile Length? A Urologist ExplainsDr. Rena Malik on YouTube · 11 min

Dr. Rena Malik calls extenders the only non-surgical option with length data, about 2 cm after months of daily use.

Increase Penile Length? What Is True and What Is NotDoctor Eric on YouTube · 5 min

Doctor Eric, a urologist, says traction shows true length gains in small studies, while pills, lotions and jelqing have no proof.

Do Penis Extenders Add Girth?

No. Girth did not change in any study, and men in our app who only used an extender had a median girth change of 0.00" (183 men). For girth, men use a pump.

No pump hours734 men42%
Under 10 pump hours731 men50%
10 to 50 pump hours240 men62%
50+ pump hours82 men72%

Share of men who measured thicker, by pump hours logged in our app. Self-measured.

Pump vs Extender, Which One Actually Builds Size?Baseem on YouTube · 5 min

An Epic kit with the extender, the Epic Pump, cups, sleeves and tape
Our kits pair the extender for length with the pump for girth.

Each does a different job, and they work best together. In our app, men who used both for a year had a typical combined gain of +0.75", and the top 10% gained +1.60" or more, length and girth together.

Men who message us after 12 to 16 months of extending and pumping report an average gain of 1.6 inches, length and girth combined, and often more when they stay consistent.

The pump side of the story is in do penis pumps work, and every girth method is in how to increase girth.

Are Penis Extenders Safe?

For most men, yes, when used as directed. Here is what studies and our own community report.

What studies sawSide effects were mild and passed on their own, such as discomfort or a numb tip. No study reported a serious problem. About 1 in 10 men stopped early.
What our members reportThe top reason men pause is a skin issue such as a blister (26% of 106 men who gave a reason). They said it healed in about 8 days. Reports of weaker erections were rare.
The rules we teachStart at low tension. Take a break every 30 minutes. Never wear it overnight. Stop if you feel pain, numbness or cold, or see a color change.

Study summary from the 2024 expert consensus. Member reports are from our Discord, counted by hand. If you have a medical condition, talk to your doctor first.

Extenders vs Other Ways to Add Length

The other options cost more, risk more, or have no measured gain at all.

MethodGain in studiesHow long it lastsIn short
Penis Extenders (Traction)+0.47 to +0.90 in length in studies (erect +1.2 cm in one). No girth.No loss in the 3 months after stopping (one study).The best-tested way to add length without surgery or needles. It takes months of daily wear.
Ligament Release Surgery+0.51 to +1.10 in hanging length. Erect length usually does not change.Long-term data is poor. It can reattach.Adds hanging length, not erect length. Doctors advise an extender afterward so it does not heal back.
Penuma (Himplant) Implant+1.22 to +1.92 in soft girth, +0.98 to +1.61 in soft length.As long as the implant stays in.The biggest soft gains on record, with a real chance it has to come out.
Jelqing and Manual StretchingNo measured data.Nothing to keepFree, but no study has measured any gain.
Pills, Creams and SupplementsNo measured data.Nothing to keepNo trial shows any size gain, and many contain hidden drugs.

From the studies linked on our methods page. Surgery and implant gains are soft or hanging length, not erect length. All 16 methods, with prices and risks, are in penis enlargement methods ranked.

What Makes an Extender Work Better

All extenders pull. The good ones make it easy to pull the right amount, for enough hours.

I started at about 14 cm bone-pressed, about 5.5 inches. My first inch came in about 3 months, on the extenders I tested before Epic existed. That is not typical, and I think some of it was better erection quality.

Then I stopped being consistent. Wearing those devices for hours was uncomfortable, so I wore them maybe 3 days a week, and my progress slowed down. That is the problem Epic was built around. A device comfortable enough to wear every day, with a tension you can read, and an app that logs every session.

Years later I still measure 16.5 cm, about 6.5 inches. That held even after a 2.5 month break when my first child was born.

From Baseem's own YouTube videos and his posts in our Discord. He designs every Epic device.

What to look for in an extender

  • A tension you can read. Men build from about 1.9 kg to 2.7 kg over three months.
  • Comfort for an hour a day. The extender you can wear most days is the one that works.
  • An app that keeps count. The men who gained most logged 250+ hours.
  • A real guarantee. Every Epic kit comes with a 180-day money back guarantee.

I Have Tried 17 Penis Extenders, Here Is the Best OneBaseem on YouTube · 7 min

Baseem shows which designs are hard to wear, which need too many hours, and which three he rates best.

See it in action

Epic Pro, Know Exactly How Long You Stretched

Extenders work when you put the hours in at a tension you can read. The Epic Pro shows your tension and your time on its screen, and the app logs every session. Baseem walks through it in about 5 minutes.

Epic Pro, The Most Advanced Penis ExtenderBaseem on YouTube · 5 min

  • Session timerThe screen shows how many minutes you have stretched.
  • Exact tensionA digital readout up to 22 lb, in pounds or kilograms.
  • Logs every sessionBluetooth sends your time and tension to the PE Trainer app.
  • Hands-freeA neck strap lets you stretch while you walk around the house.

Comparing brands? We compare 15 extenders side by side in our guide to the best penis extenders.

Real Results From Epic Buyers

Photos our buyers sent us. The previews are blurred. The real photos are graphic, so they open only when you tap.

Deon J.

+1.7" length14 months
Deon J. photo pair, +1.7 inches length, 14 months (blurred preview)

Graphic photos

One night I saw a guy post his 9-month results and I thought that could be me in 9 months or I could still be scrolling. Ordered the starter kit that night. Fourteen months in. +1.7 inches.

Used: Epic Extender and ADS

Andre P.

+1.6" length
Andre P. photo pair, +1.6 inches length (blurred preview)

Graphic photos

+1.6 inches length from consistent extender use.

Used: Epic Extender Pro

James Navarro

+1.2" length3 months
James Navarro photo pair, +1.2 inches length, 3 months (blurred preview)

Graphic photos

At 35 I'd basically given up on my sex life because of my size. I finally feel like there's real hope.

Used: Epic Extender Pro

Diego F. Castillo

+1.1" length+0.6" girth
Diego F. Castillo photo pair, +1.1 inches length and +0.6 inches girth (blurred preview)

Graphic photos

Thousands of dollars over four years. This bundle is the first system where pump and extender actually work together and gains STAYED.

Used: Epic Extender, ADS and pump

These are some of our best individual results, not what most men get. The typical man in our app was up about 0.47 inches at month 12. Some buyers were rewarded for sharing their photos. Results vary. See more stories and photos in penis extender before and after.

What Men on Reddit Say About Epic

Word for word, from men who own our extenders. No paid affiliates.

0.14 inch gain in 1 month with the epic extender. Glad to break the plateau.

Epic Pro owner, 2025 Read on Reddit

Epic extender pro is legit. Pricy but worth it in my opinion. You can even track progress in app.

Epic Pro owner, 2026 Read on Reddit

The digital scale is really cool and tracks accurately when extending in different directions

Epic Pro owner, 2026 Read on Reddit

it fits well, it comes with different cups and sleeves of different sizes and is a pretty comfy stretch.

Epic Pro owner, 2026 Read on Reddit

Their extender is top tier as well. I haven’t tried any other ones but iv never had issues with mine

Epic Pro owner, 2026 Read on Reddit

I personally use the epic extender and have since day 1 of my PE journey and have loved it.

Epic Pro owner, 2025 Read on Reddit

Quotes from men who own or used Epic gear, from r/gettingbigger.

The Extenders We Build

An extender for length. Add a pump for girth. Every kit works with the free PE Trainer app.

Best for length

EPIC Extender

Epic Extender Pro

4.9 from 44 reviews

Vacuum cup, digital tension screen and the free PE Trainer app that logs every session.

From $379

See the Extender Pro

Length and girth

EPIC ハイドロキット

Epic Hydro Kit

The Epic extender for length plus the Epic Hydro pump for girth, which works with water or air.

From $599

See the Hydro Kit

Length and girth, air only

EPIC エアキット

Epic Air Kit

The Epic extender for length plus the Epic Air pump for girth, in one kit.

From $549

See the Air Kit

Every Epic kit comes with a 180-day money back guarantee.

Do Penis Extenders Work FAQ

Do penis extenders really work?

Yes, for length. Published studies found gains of 1.2 to 2.3 cm after 3 to 6 months of daily wear. In our app, 90% of men who logged 250 or more hours measured longer than when they started. Our numbers are self-measured, not a clinical trial.

Do penis stretchers work?

A penis stretcher is another name for a penis extender, so the same data applies. All-day stretchers are a lighter kind you wear under clothes at low tension. Our coaches use them after an extender session, not in place of one. Read more in what is an all-day stretcher.

How much length can you gain with a penis extender?

It varies a lot from man to man. In our app, the typical man had added about 0.47 inches by month 12, and the top 10% had added 1.02 inches or more. Men with 250 or more hours did best. 59% of them gained half an inch or more.

How long does a penis extender take to work?

Months. Most men notice a first change after about 4 weeks, usually in erection quality or soft hang. The typical man first measured a quarter inch longer at month 9.

How many hours a day do you need to wear a penis extender?

Older studies used 4 to 9 hours a day. A newer trial used 30 to 90 minutes. In our app the typical extender day is 60 minutes. Our coaches say to do at least 1 hour a day and build to 2 to 3 hours, in sessions of 30 to 60 minutes with short breaks.

Are penis extender gains permanent?

Small studies that kept measuring men after they stopped found the length held for the 3 to 6 months they were followed. Once you reach your goal, our coaches still suggest a few short sessions a week to keep it.

Do penis extenders increase girth?

No. Girth did not change in any study, and men in our app who only used an extender had a median girth change of 0.00 inches. A pump is what adds girth. 72% of men with 50 or more pump hours measured thicker. Read do penis pumps work.

Are penis extenders safe?

Used as directed, yes for most men. In studies, side effects were mild and passed on their own. Start at low tension, take breaks and never wear it overnight. Stop if you feel pain or numbness, or see a color change. If you have a medical condition, talk to your doctor first.

Do doctors recommend penis extenders?

Some do. Europe's urology guideline tells doctors to consider traction for men who want more length, and rates the evidence as limited. A 2024 expert consensus says it can be offered. No large US urology group has taken a position on extenders for size.

Do penis extenders work for a curved penis?

Traction has been studied for it. In a randomized trial, men with a curve who wore a traction device 30 to 90 minutes a day gained 1.5 cm of stretched length, while men without it did not change. Our products are not intended to treat any disease, so talk to a urologist first. Read penis extenders and Peyronie's disease.

Why did my penis extender not work?

The usual reasons are too few hours, a poor fit or measuring the wrong way. In our app, men with under 25 hours measured no better than men who logged nothing. Our coaches most often fix the cup or sleeve size first.

Is a penis extender better than surgery?

It is the option experts say to try first. Lengthening surgery adds hanging length, not erect length, and a review by size-anxiety experts said injections and surgery should stay a last option. An extender costs far less and you can stop any time.

How we wrote this. Study numbers come from the published abstracts, each linked above. Guideline quotes are word for word. App numbers come from the Epic Traction Report: 18,917 accounts and 225,802 logged training hours, self-measured, with no control group. Epic Extender sells extenders, so we kept the studies and statements that are not in our favor too.

Read Next

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Results vary. This article is general information, not medical advice. Our products are not intended to diagnose, treat, cure, or prevent any disease and have not been evaluated by the FDA. Consult your doctor if you have a medical condition.