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Not medical advice. The Atlas is not a substitute for a clinician who can examine you.

Traction Device Brands Compared

RestoreX vs PeniMaster Pro vs Phallosan Forte vs SizeGenetics / Quick Extender Pro

Evidence grade 3 of 5, Mixed. Read how the Atlas grades evidence.

The written rationale for this grade is still being prepared.

FDA
Most marketed as wellness devices; RestoreX has registered medical-device claims for Peyronie's

Reference only. Not medical advice.

This is something to take to a clinician. The Atlas can tell you what is known about traction device brands compared in general. It cannot tell you what is happening in your body, and the difference matters most for exactly the symptoms that bring people to this page.

Penile traction therapy (PTT) applies sustained mechanical tension to the shaft to drive tissue remodeling. The critical distinction, emphasized by the ISSM/SMSNA, is between traction for Peyronie's disease and post-prostatectomy length preservation (where there is real randomized evidence) versus traction for cosmetic lengthening of a normal-size penis (where evidence is thin and gains are modest). Brands differ mainly in attachment mechanism (rod-and-noose, vacuum cap, or counter-bend hinge) and comfort, which drives the adherence that actually determines results.

Strong evidence for Peyronie's curvature; weak-to-none for lengthening a normal penis.

What people take it for

These are the reasons people give for taking it. They are not effects it has been shown to have.

  • Peyronie's disease curvature reduction (best evidence)
  • Post-prostatectomy length preservation
  • Adjunct before/after penile surgery
  • Cosmetic lengthening (weak evidence)

How it is supposed to work

Sustained tension induces mechanotransduction, cyclic stretch activates fibroblasts and collagen turnover, theoretically lengthening the tunica albuginea and, in Peyronie's, remodeling the fibrotic plaque to reduce curvature. The biology is plausible and supported in connective-tissue models, but the magnitude of cosmetic gain in a normal penis is small and slow.

The Peyronie's vs lengthening distinction

ISSM/SMSNA guidance treats these as different questions with different evidence. For Peyronie's and for post-prostatectomy preservation, randomized data (notably the RestoreX trials from Mayo Clinic) support real, measurable benefit. For lengthening an anatomically normal penis purely for cosmetic reasons, the evidence is far weaker, gains in uncontrolled studies are typically under 1-2 cm, require months of daily wear, and may regress without maintenance. Marketing routinely blurs the two, citing Peyronie's-disease data to sell cosmetic lengthening to normal-size men.

Safety in detail

Penile traction involves sustained mechanical force on erectile tissue and nerves. Excessive or improper use can cause numbness, bruising, skin tears, and discomfort. Men with erectile dysfunction or Peyronie's disease should not begin traction without evaluation by a urologist; do not self-treat curvature.

What people get wrong

  • Often saidExtenders permanently add inches to a normal penis

    ActuallyRigorous data show modest gains (commonly <1-2 cm) only with months of disciplined daily wear, and the strongest evidence is in Peyronie's and post-surgical contexts, not cosmetic enlargement.

  • Often saidAll extenders are equivalent

    ActuallyMechanism and comfort drive adherence, and adherence drives results. The counter-bend (RestoreX) and vacuum-cap designs differ meaningfully in wear time tolerated.

Who profits, and who pushes back

Nobody is named here yet, because we have not done that work on this entry. Read that as unfinished. Somebody almost certainly sells this, and somebody almost certainly disputes it. Assume both until we have checked.

At a glance

Typical regimen
30-90 min/day, often 3-6+ months
RestoreX Peyronie's RCT gain
mean ~1.5 cm length vs 0 in controls
Adherence
The single biggest predictor of any result
Cosmetic length evidence
Limited, small, mostly uncontrolled

What this entry does not yet cover

What follows is unfinished work on our side, not a finding about Traction Device Brands Compared. A short entry is not a safe entry.

  • Timeline. We have not built the dated record of research and regulatory events.
  • Cost and market. We have not documented what it sells for or who sells it.
  • Supply chain. We have not mapped where it is made.
  • Who uses it. We have not documented the user groups.
  • What could change. No forward-looking summary yet.
  • How it compares. We have not set it against the alternatives.
  • Children and teenagers. We have not checked what is known about younger people.
  • What can go wrong. We have not written the risk line for this one. Read the safety section below rather than treating its absence as reassurance.
  • Where we land. We have not taken a position on this yet.

Sources

The studies below are named and described, but not linked. You cannot open them from here and check our reading against them, which means this page is our summary of the literature rather than a document you can verify. Weigh it accordingly until the links exist.

The studies that matter

  • RestoreX randomized single-blind trial (Peyronie's), J Urol2019

    110 men: traction group gained mean ~1.5 cm length vs 0 in controls (p<0.001) and ~17 degrees curvature improvement; no significant adverse events.

  • RestoreX open-label and follow-up, J Sex Med2020

    Sustained curvature and length benefit at follow-up; ~94% of an extended cohort achieved a mean ~1.6 cm gain with high adherence.

  • RestoreX post-prostatectomy RCT, J Urol2022

    Single-center RCT showing length preservation/improvement and erectile-function benefit after radical prostatectomy.