Clinical Studies Prove the Effectiveness of Penis Extenders

Penis extenders offer many advantages, such as lengthening of the shaft of the penis, stronger erections and increased penis girth. Some of these changes are well-established and can be measured under laboratory conditions.

Penis traction is very well-researched through numerous scientific studies.

Traction is a scientific and very effective method of tissue lengthening, and it can be used for penis enlargement. Numerous studies prove that extenders and other traction devices lead to penis growth.

Men who wish to use this method of penis enhancement need to wear extenders on a daily basis in order to reach the desired length. This method of penis growth is very well-researched through numerous scientific studies.

Research-Based Evidence

Penis extender

The results have been published in clinical journals and other valid scientific publications. This method is proved to be safe and very effective.

This article lists some of the well-known clinical and scientific studies dealing with penis enlargement via traction.

All of them prove that this method can be used for penis enlargement and they strongly support the use of extenders, especially for increasing the length of the penis.

Study #1: University of Turin (Italy)

This study was first published in the British Journal of Urology[1] and it was performed by the team of researchers from San Giovanni Battista Hospital at the University of Turin, Italy.

This was an extensive, 12-month study. The results provide the most authentic and well-established evidence of penis growth with the help of extenders.

The Participants

The participants were 16 highly motivated patients whose average age was 47. The average flaccid penile length of participants was 7.15 cm (2.82 inches), while the average stretched length was 9.62 cm (3.79 inches), measured at baseline.

The patients were asked to wear a penis extender device on a daily basis. They were required to wear the extender for between 4 and 6 hours a day for six months. Regular follow-ups were performed in month one, three, six and at the end of the study.

Amazing Results: 32% Increase In Penile Length

British Journal of Urology

The results were incredible. The study found that after 12 months:

  • The patient’s average flaccid penile length had increased from 7.15 cm (2.82 inches) to 9.45cm (3.72 inches). This is 32% increase in penile length.
  • The patient’s average stretched length had increased from 9.62 cm (3.79 inches) to 11.32 cm (4.45 inches) at baseline. This is 18% increase in stretched penile length.

In addition to this, patients had reported high satisfaction levels in all the categories.

The researches concluded that “penile extenders should be regarded as a minimally invasive and effective treatment option to elongate the penile shaft in patients seeking treatment for a short penis”.

The results of this study prove that penis extenders are a very effective, safe and durable method of penis enlargement, and they work for both flaccid and stretched penis state.

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Study #2: Canadian Journal of Phalloplasty

This study was performed by the Canadian Journal of Phalloplasty[2]. The results proved that men who used traction methods, such as penis extension devices, achieved remarkable increase in penis length, ranging between 32% and 36%.

If these studies indicate similar results, penis extender devices should used as the primary method for penile lengthening

Participants in this clinical study were asked to wear the device for 6 to 8 hours per day, for 5 months. At the end of the study, the patients reported about a 32% increase in penile length, both flaccid and erect. The most noticeable result, however, was the reported 36% increase in penis girth (thickness).

In addition to this, the patients reported a remarkable (36%) increase in erectile strength. These men experienced increased blood circulation and hardness of the penis. This study shows that penis extenders can be effectively used for both increasing the size of the penis and achieving stronger erections.

It’s important to note that these results did not disappear after the usage.

Study #3: Scandinavian Clinic of Plastic Surgery

This study was performed in Copenhagen, at the Scandinavian Clinic of Plastic Surgery. The goal was to evaluate and measure penis stretching which occurs as a result of using penis extender devices.

Complete Study

The results of this study were presented[3] at the 1st International Interdisciplinary Symposium on Genitourinary Reconstructive Surgery in Barcelona, Spain. The study showed remarkable results in increasing penis length for all patients.

The participants were 18 men (23 to 47 years of age). They were asked to wear the extender for 12 hours a day, 7 days a week, for up to 8 to 24 weeks.

Over the course of 4 months, the reported increase in length averaged almost 2 inches (5 cm). In addition to this, the research team concluded that the average lengthening was 1.9 mm per week.

Did you know that all patients in this study achieved penile extension with the SizeGenetics/JesExtender device?

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Other Notable Studies

Numerous other studies prove the increase of penile length and girth with the help of extension devices. For example, a small study published in the Journal of Sexual Medicine[4] found that penile extenders can be successfully used to reduce penile curvature as well as for adding length to the penis.

All of these clinical studies show a clear evidence in favor of traction devices. It can be safely concluded that penis extension devices can be effectively used for increasing penis length and girth.

In short, these studies prove that penis extenders can be used as a safe alternative to penis surgery and other methods of penis enlargement.

High quality traction devices, such as SizeGenetics are backed by REAL doctors, and REAL medical evidence to prove that if your want to extend your penis YOU CAN!


Peter is a writer for He started in the men's health industry just like you - by searching the Internet for devices and supplements that deliver real results. Show him some love by following @petevita on Twitter.

  1. BJU International Volume 103, Issue 6, pages 793–797, March 2009 A pilot phase-II prospective study to test the 'efficacy' and tolerability of a penile-extender device in the treatment of 'short penis'
  2. Conducted by the Canadian Journal of Phalloplasty in conjunction with X4 Labs Inc., the study indicated that penile extenders or traction devices can effectively be used as an alternative means to plastic surgery or augmentation
  3. The study presented at the International Interdisciplinary Symposium on Genitourinary Reconstructive Surgery, in 1998, at Barcelona, Spain, from a study called Tractive Elongation of the Penis by Means of Stretching by Jørn Ege Siana, MD, Scandinavian Clinic of Plastic Surgery, Copenhagen.
  4. The Journal of Sexual Medicine Volume 6, Issue 2, pages 558–566, February 2009 Use of Penile Extender Device in the Treatment of Penile Curvature as a Result of Peyronie's Disease