In the world of male enhancement devices, few products have the medical heritage and clinical credibility of the ProExtender. Developed in 1994 by Jorn E. Siana, M.D. in Denmark, this device was initially designed as a treatment for Peyronie’s disease – a condition where fibrous scar tissue causes penile curvature, discomfort, and, in some cases, functional problems.
Unlike many extenders that entered the market purely for cosmetic enlargement, the ProExtender began its life as a medical therapy. It has been recommended by doctors in over 29 countries, used in more than 60 hospitals, and continues to be sold as a clinically supported solution for both curvature correction and enlargement.
But the real question in 2025 is this: can a nearly 30-year-old design still hold its own against newer, more advanced traction devices? At Alpha John, we put it through a detailed evaluation – combining hands-on testing with a deep dive into the scientific literature – to find out.
📊 What Science Says About Penile Traction Therapy
Before we explore the specifics of the ProExtender, it’s important to understand the science behind penile traction therapy (PTT) – the principle upon which all extenders operate.
A large randomized controlled trial using the RestoreX device for Peyronie’s patients showed an average length gain of +1.5 cm in 3 months and a −11.7° curvature reduction with just 30–90 minutes of daily use (PubMed).
After 6 months, the same study reported 2.0–2.2 cm gains and curvature improvement in 61% of participants (Tau AME Groups).
Other clinical reports have documented increases up to 2.5 cm and curvature improvements of up to 45°, especially with longer daily wear times (PMC).
Beyond size, PTT can improve erectile function and blood flow, suggesting potential benefits in mild erectile dysfunction (Time.com).
The ProExtender uses the same fundamental mechanism, which means that, in theory, its results should align with those seen in modern PTT studies – assuming proper use and sufficient daily wear time.
History and Development
The ProExtender’s story begins in the early 1990s, when Dr. Siana adapted orthopedic traction concepts — techniques already used for limb lengthening and post-fracture bone realignment — for use in penile correction. This adaptation wasn’t just theoretical; it was rigorously tested before being introduced to patients.
By 1998, the ProExtender had been presented at the International Interdisciplinary Symposium on Genitourinary Reconstructive Surgery in Barcelona, Spain. Clinical case studies documented that sustained traction could not only reduce curvature but also trigger measurable increases in both penile length and girth.
In trials, patients reported unexpected secondary benefits: firmer erections, increased stamina, heightened arousal, and greater overall sexual satisfaction. These effects aligned with the biological principle of mechanotransduction — where cells respond to prolonged, gentle mechanical stress by dividing and forming new tissue.
Design and Construction
The ProExtender is a rod-based traction device consisting of a base ring, adjustable metal rods, and a glans attachment system using a silicone noose. The rods can be lengthened by adding short or long extension bars, allowing the device to adapt as gains are made.
Its traction spring system offers force settings between 300–1500g, which is sufficient for tissue expansion but lower than the maximum tension available in newer models (some reaching up to 2800g). Lower tension can be gentler on beginners but may slow down potential gains for experienced users.
Kit Contents
Basic Package (Cardboard Box)
Original ProExtender device
Foam padding
1 silicone noose
1 set of short extension bars
1 set of long extension bars
Instructional DVD
Instruction manual
Complete System (Metal Case)
Everything from the Basic Package
1 bottle of VigRx Plus
1 bottle of Semenax
Using the ProExtender
Setup and Comfort
Wearing the ProExtender involves inserting the penis through the base ring, securing the glans under the silicone noose, and adjusting the rods to create the desired tension. Beginners are advised to start at the lowest tension and wear the device for 1–2 hours daily, gradually building up to 4–6 hours.
The silicone noose attachment is functional but can cause discomfort or slippage for some users, especially during longer wear sessions. Modern vacuum bell systems tend to offer more comfort, but the noose is still considered effective when adjusted properly.
Expected Results Timeline
1–2 months: Initial tissue adaptation, improved flaccid hang, and minor curvature improvement.
6–12 months: Maximum potential gains reached; results typically become permanent.
Consistency is critical. Skipping weeks or reducing wear time dramatically slows progress.
Permanence of Results
Traction-induced changes are structural, meaning they persist over time. While minor retraction can occur if the penis is neglected for years, the bulk of gains remain long-term once new tissue has formed.
Additional Benefits Reported in Trials
Reduction in Peyronie’s curvature
Improved sexual pleasure and arousal
Increased stamina and erection duration
Potential improvement in mild erectile dysfunction symptoms
Maximizing Results with ProExtender
To get the best from the ProExtender:
Wear it consistently, building up to 4–6 hours daily
Ensure proper hygiene and cleaning of device components
Use a mild talcum powder or comfort padding to reduce skin irritation
Pair with cardiovascular exercise and healthy nutrition to improve circulation
Consider using a quality male enhancement supplement to support vascular health
Pros and Cons
Pros
Decades of clinical and hospital use
Proven track record for both Peyronie’s and enlargement
Durable construction with replaceable parts
Backed by medical professionals in multiple countries
Cons
Lower traction force compared to newer extenders
Silicone noose is less comfortable than vacuum systems
Dated aesthetics and packaging
High retail price without promotional discount
Price and Availability
The ProExtender is available directly from the official ProExtender System website. The regular price is $859.90, but a current promotion reduces it to $429.95 (50% off). The promotional code is displayed on their website, but no end date for the offer is stated.
Comparison with Modern Extenders
While the ProExtender remains effective, newer models such as SizeGenetics and Phallosan Forte have introduced upgrades:
SizeGenetics: Higher maximum tension (up to 2800g), more comfort options, and better concealment under clothing.
Phallosan Forte: Belt-based, vacuum bell system for superior comfort and discreet wear.
If comfort, higher tension, and modern aesthetics matter to you, one of these newer options may be preferable. However, the ProExtender’s medical pedigree and proven track record still make it a credible choice.
Alpha John’s Verdict
The ProExtender is a true pioneer in the penile traction space. It has helped thousands of men improve confidence, correct curvature, and increase size – all without surgery or drugs. While it lacks some of the comfort and design refinements of modern extenders, it remains a legitimate, medically-backed option for those willing to commit to consistent daily use.
If you value proven history over cutting-edge features, the ProExtender still deserves consideration in 2025. For men seeking faster results and maximum comfort, exploring more modern alternatives may be worthwhile.
I am interested in all aspects related to mens's health, in particular sexual health as we age. In my spare time I like to train with weights since that's a great way to boost your testosterone levels and feel overall happy. It is never too late to change your lifestyle into something better. Small positive changes will accumulate over time and bring you happiness in life. You can find my opinions on supplements and devices for men on this website, and also from users such as yourself. Remember to do your research before buying anything.
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