Penis extender device
Penis Extenders & Traction
Traction devices are the only non-surgical option with clinical evidence for adding flaccid and erect length — worn consistently over months. We recommend the Phallosan Forte.
How it works
Gentle, sustained traction.
A penis extender applies a gentle, sustained stretch along the shaft. Held under steady tension over a long period, the tissue gradually adapts and lengthens — the same principle used elsewhere in medicine. Results depend on consistent daily wear over several months; the evidence points to modest but real gains, and Androfill's core girth treatment (filler) is separate from this.
The device we recommend
Phallosan Forte.
Phallosan Forte
A comfortable, vacuum-protector traction system designed for long daily wear — clinically studied for length gain in both the flaccid and erect states, and also used for correcting curvature (Peyronie's). Developed with urologists at the Fraunhofer Institute, with numerous patents since 1996.
Order Now →Using the device
How to wear it.
Phallosan Forte works differently from a rigid rod extender. The glans is held in a soft, vacuum-sealed protector cap, which is then connected to a sleeve and an adjustable belt worn around the waist. The belt applies a gentle, even pull to the side — so the device sits flat and is discreet under clothing.
- Create the vacuum seal so the protector cap holds the glans comfortably and securely.
- Attach the sleeve and fasten the belt around your waist, routing the device to the left or right.
- Set the tension using the colour-coded strength bands — start gentle and build up over time.
- Wear it for a few hours a day (the study averaged about 6 hours); comfortable enough for long sessions and even overnight once accustomed.
Always follow the manufacturer's instructions. Reduce tension or stop if you feel pain, numbness or discolouration. Full fitting and usage guidance is supplied with the device and at phallosan.com.au.
The evidence
The Phallosan clinical study.
A German urological clinical study
Following the launch of Phallosan Forte in 1999, a German urological healthcare facility ran a clinical study to assess whether the device could meaningfully lengthen the penis. Of 26 men initially enrolled (aged 20–68), 24 were included in the analysis. Participants wore the device for an average of 6 hours a day (range 2–10 hours) over 6 months.
- Flaccid length increased markedly by 3 months and significantly more by 6 months — with greater gains in the second three months than the first.
- Erect length followed the same pattern: higher at 3 months, higher again at 6 months.
- Girth also increased at 3 and 6 months, with gains described as evenly distributed.
- Curvature: one participant with a curved penis showed noticeably reduced curvature after 6 months.
- Satisfaction: 22 of 24 reported higher overall satisfaction; improvements were also reported by some in erection quality, duration, hardness and sensitivity.
In 2006, The Journal of Sexual Medicine reported the clinic's findings, concluding that with continuous use men can increase penis length by wearing the extender for six months or more. Individual results vary; figures are averages, not a single result.
| Result* | After 3 months* | After 6 months* |
|---|---|---|
| Length increase at rest | 3.5 cm (1.38″) | 4.9 cm (1.93″) |
| Length increase erect | 3.8 cm (1.5″) | 4.8 cm (1.89″) |
| Increase in circumference | 2.5 cm (0.98″) | 2.5 cm (0.98″) |
* The results are peak values. A longer period of use can potentially achieve even better results. In addition to the regularity and duration of use of PHALLOSAN forte, individual factors also play a role. Accordingly, results vary from user to user and cannot be guaranteed.
The wider science
Do extenders really work?
Penis extension devices have some scientific validity. In theory, sustained traction should stimulate new tissue growth in the penis, and — unlike penis lengthening surgery (ligamentolysis), which only increases flaccid length — a traction device can increase both flaccid and erect length.
Gontero et al. (2009)
A pilot phase-II prospective study of a penile extender in men with a "short penis." Wearing the device 4–6 hours daily over 6 months produced a measurable mean increase in flaccid length (~1.3–1.7 cm), and the device was well tolerated.
Read the study (PDF) ↗Phallosan study · P-04-230
The German urological study of Phallosan Forte itself: with continuous use over 6 months, participants increased penile length in both the flaccid and erect states, with gains in girth and high satisfaction (22 of 24 men).
Read the study (PDF) ↗Modern traction devices (2025)
A contemporary review of 15 studies (1,000+ patients) found modern traction devices achieved penile length gains averaging 1.5–2.3 cm with high adherence, alongside curvature reduction in Peyronie's disease. A noted limitation across the field: long-term persistence of gains after stopping is not yet well established.
Read the review ↗The honest caveat: results require a high level of commitment (often 1,000+ hours of wear), and many extenders are uncomfortable. In practice a significant permanent gain is hard to achieve, and many users stop after a month or two. The key to results is finding a device comfortable enough to wear for the maximum time under tension — which is exactly the problem Phallosan's vacuum-and-belt design sets out to solve, replacing the loop-around-the-head pressure point with a sealed vacuum that transmits tension via a waist belt.
Phallosan Forte · FAQ
Common questions.
What gains can I expect? +
Will the head (glans) enlarge too? +
Does it increase girth as well as length? +
How do I use it if I'm uncircumcised? +
Is there a minimum size to use it? +
Can I wear it at work or in public? +
What's the recommended usage time? +
Can I wear it while sleeping? +
Can it help penile curvature or Peyronie's disease? +
Is shipping discreet? +
Pros & cons
Extender vs filler.
A lot of patience is required to achieve results with Phallosan Forte, or any penis extender. While the science behind extenders is sound, in practice many men give up due to the amount of commitment required.
The Androfill filler procedure, by contrast, provides an instant increase in girth — which can be dramatic depending on how much filler is used. The trade-off is cost: Androfill is considerably more expensive than buying a penis extender.
- Non-surgical, one-off cost
- Adds length (flaccid & erect)
- Needs months of daily wear
- Many give up before results
- Instant, often dramatic girth
- In-clinic, ~30 minutes
- Higher upfront cost
- Adds girth, not length
Before & After
Book Androfill
* Individual results vary from person to person.
Where Androfill fits
Girth is our speciality.
Extenders target length. Androfill's core treatment is girth enhancement with reversible filler — an in-clinic procedure with an immediate, visible result. The two can be used alongside each other if length is also a goal.
For immediate thickness, see penis fillers or estimate your result with how much filler.
Questions about length vs girth?
A private consultation with Dr Anderson will point you the right way.
About this page
Last reviewed on 28 July 2026.
Written and medically reviewed by Dr Brent Anderson (MBChB), Fellow of the New Zealand Society of Cosmetic Medicine, who leads Androfill in New Zealand.
Information on this page is drawn from the published literature on hyaluronic-acid penile filler and from Androfill’s clinical experience since 2012. It is general information, not a substitute for a consultation — your own suitability, options and risks must be assessed in person by your doctor.