Penis Resources

Penis Extender Studies and Research

Penis extenders, or penile traction devices as they're commonly called, are part of an evolving trend towards do-it-yourself penis enlargement modification therapy. While medical science has already acknowledged the effectiveness of these devices in the treatment of conditions such as Peyronies Disease (curvature of the penis), it is their incredible ability to increase both the length and girth of the penis that has captured the most attention.

If your interest is in using one of these devices to increase penis size rather than reviewing research data, please see our enlargement device comparison table for more information on the latest and most effective models.

Medical Studies

The ever-growing body of documented evidence is proving that penis extenders are not only a safe and inexpensive alternative to surgery, but perhaps one of the most effective means ever developed to naturally enlarge the penis.

Study Confirms Penis Extender Effectiveness

Penis Extender StudyThe results from this penis extender pilot study were published in The Journal of Sexual Medicine (Mar. 2008). Results confirm both the reduction of penile curvature as well as an increase in overall penis length and girth.
Published Study: Penile Traction Therapy ... A Single-Center Pilot Study
DOI 10.1111/j.1743-6109.2008.00814.x

Penis Extender Phase II Study Completed

Penis Extender Phase 2 StudyFollow up to the aforementioned penis extender study published Dec. 2008. Results showed a less than anticipated reduction in penile curvature but "reasonable level of patient satisfaction, probably attributable to increased penile length."
Published Study: Penile Extender Device ... Results of a Phase II Prospective Study
DOI 10.1111/j.1743-6109.2008.01108.x

Penile Extenders Medically Proven to Increase Penis Size

BJUI Penis Extender StudyFirst study performed solely to assess the viability of increasing penis size using extender devices concludes, "...should be regarded as a minimally invasive and effective treatment option to elongate the penile shaft..."
Published Study: Study to test the 'efficacy' of a penile-extender device ...
DOI 10.1111/j.1464-410X.2008.08083.x

X4 Labs Extender Press Release

X4 Labs Press ReleaseMedical study conducted by the Canadian Journal of Phalloplasty in conjunction with X4 Labs Inc. finds men who used traction devices achieved gains ranging between 32% and 36%.
Press Release: Penile Extenders to be Used as Primary Means for Penile Lengthening
PRWeb / March 18, 2009

Scientific Study on Penile Enlargement Devices

Penile Enlargement Device StudyThis prospective study was performed to measure the changes that penile stretching devices promote in flaccid and stretched penile lengths. Researchers concluded "Our findings supported the efficacy of the device in increasing penile length."
Published Study: Effect of Penile-Extender Device in Increasing Penile Size ...
DOI 10.1111/j.1743-6109.2009.01662.x

Penile Traction Devices Lengthen Penis? Fact.

BJUI Article Penis DevicesAn article published in the BJUI examines alternatives to penile enlargement surgery and concludes that penis traction devices (penis extenders) are an ideal and non-invasive method of naturally increasing penis length.
Published Article: Non-invasive methods of penile lengthening: fact or fiction?
DOI: 10.1111/j.1464-410X.2010.09647.x

Penile Prosthesis and Penis Traction Therapy

Penile Prosthesis TractionA case study published in the Journal of Sexual Medicine (Volume 8, Issue 2, pages 607-611, February 2011) shows that traction effectively increases penis size in a patient with a penile prosthesis.
Published Article: Revision of Penile Prosthesis Surgery after Use of Penile Traction ...
DOI: 10.1111/j.1743-6109.2010.02121.x

Penis Traction and Prosthetic Implant Study

Implant Extender StudyA pilot study published in the Journal of Sexual Medicine examines the effectiveness of traction therapy when used prior to penile prosthesis implantation. Study consists of 10 men with a condition known as shortened penis.
Published Article: Traction Therapy for Men with Shortened Penis ...
DOI: 10.1111/j.1743-6109.2011.02285.x

How Long To Wear A Penis Extender Device, Study Reveals

Penis Extender Time StudyStudy to assess the benefit of penile traction therapy used in combination with other non-surgical treatments. Demonstrates a trend toward measured length and curvature improvement related to duration of use of device.
Published Article: Combination of Penile Traction ... Therapies for Peyronie's Disease
DOI: 10.1111/j.1743-6109.2012.02690.x

Penile Traction Therapy For Penis Enlargement

Traction Therapy StudyThis study was conducted in part to determine the outcome of penis length changes on patients undergoing penile curvature correction and measure the impact of penile traction therapy both postoperative and pre-op.
Published Article: A Retrospective Comparative Study of Traction Therapy...
DOI: 10.1111/j.1743-6109.2012.02849.x

Confirmed: Latest Trial Supports Penile Traction Validity

Peyronies CurveIn this trial, a group of Urologists tested the effectiveness of penile traction therapy when used on men suffering from Peyronies Disease. Ultrasound imaging was used to confirm the reduction of plaque deposits.
Published Article: Acute Phase Peyronie's Disease Management with Traction Device...
DOI: 10.1111/jsm.12400

Penis Extender Trial Results

SizeGenetics Enlargement Results

SizeGenetics Test ResultsProduct:
Duration: June 08' - January 09'
Length Increase: 1.95 inches
Width Increase: 1 inch

Jes Extender Growth Results

Jes-Extender Test ResultsProduct: Jes-Extender
Duration: July 08' - February 09'
Length Increase: 1.2 inches
Width Increase: .75 inches

X4 Labs Penis Extender Trial Results

X4Labs Test ResultsProduct: X4 Labs Penis Extender
Duration: October 08' - May 09'
Length Increase: 1.6 inches
Width Increase: .9 inches

FastSize Extender Trial Results

FastSize Test ResultsProduct: FastSize Extender
Duration: February 09' - September 09'
Length Increase: 1.3 inches
Width Increase: .6 inches

ProExtender System Trial Results

ProExtender Test ResultsProduct: ProExtender
Duration: December 09' - July 10'
Length Increase: 1.65 inches
Width Increase: .9 inches

Male Edge Device Trial Results

Male Edge Test ResultsProduct: Male Edge
Duration: May 10' - December 10'
Length Increase: 1.75 inches
Width Increase: .95 inches

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