Do Penile Traction Devices Work? Length, Girth, and Medical Traction Research

Some penis-enlargement methods use a dedicated device to pull the penis in one direction.

Unlike jelqing or self-directed hanging with weights, medical Penile Traction Therapy, or PTT, has clinical research.

The 2026 ICSM recommendations present penile traction as one option for length. The expected change is limited, and research on dedicated devices and conditions cannot be converted into self-directed pulling.

The 2026 ICSM recommendations report an average of about 2 cm

The 2026 International Consultation on Sexual Medicine recommendations summarize reports of an average increase of about 2 cm in length after at least three months of daily penile traction.

It is tempting to read this as “the device adds 2 cm,” but it does not mean everyone gained 2 cm.

Devices, participants, durations, and measurement methods differed between studies. The ICSM also states that long-term durability and whether one device is better than another remain uncertain.

Not every product sold commercially has the same performance as a device used in a clinical trial.

The EAU separates length from girth

The EAU guideline on penile size states that penile traction may increase flaccid or stretched length.

It does not describe it as an effective way to increase girth.

It is therefore not medically sound to conclude that a device will reliably increase both length and girth.

The EAU considers traction a conservative option for penile length, but the quality of evidence is not high. There are few randomized controlled trials, and study populations are small and heterogeneous.

There are also medical uses such as Peyronie’s disease

Penile traction is not studied only for cosmetic length.

The EAU discusses research for curvature from Peyronie’s disease and for preserving or restoring length after prostate surgery.

The Peyronie’s guideline says traction devices and VEDs may be proposed to reduce deformity or as part of combination treatment, but the outcome data remain limited.

A device used in a medical condition cannot be reframed as “pull harder yourself and it will grow more.”

It is different from hanging or pulling by hand

Research on a traction device does not prove the effectiveness of attaching weights to the penis or pulling hard by hand.

Medical PTT studies use devices designed for that purpose.

Self-directed traction makes the applied force difficult to control, so clinical-trial results cannot simply be applied.

BananaUp does not include hanging, strong traction, jelqing, or clamping as Routines. It also does not provide specific self-use instructions for medical PTT such as time or tension.

Commercial products are not all equivalent

The ICSM notes that many devices on the market may not have undergone strict scientific evaluation.

There are also not enough comparative trials to show which device is best.

Separate “medical traction has some research” from “this device found online has the same effect.”

If concern about size is strong and you are considering traction, it is safer to discuss actual size and possible conditions with a urologist or another qualified professional first.

BananaUp does not create a size-enlargement Routine

BananaUp is not designed to change size by applying strong force directly to the penis.

It focuses on Routines that can be followed with daily Condition, such as pelvic-floor work, Cardio, sleep, and stress.

The medical research on traction is not hidden, but it is not converted into a general self-care Routine.

Stop and seek medical advice for pain, swelling, numbness, skin injury, sudden curvature or deformity, or a change in erections after using a device or self-directed traction.

If your concern is firmness or ease of maintaining an erection rather than size, the Male Condition Check can help organize other factors.