X4 Labs Extender In-Depth Review [UPDATED]

The X4 Labs extender is a traction-based medical device designed to provide a permanent enlargement of the penis. The device slowly stretches the tissues of the penis, with the claimed growth of up to 35 percent, or about two to three inches for people who start with average-sized penises. The manufacturer also states that the stretching process is safe and produces stronger erections in addition to overall growth.

This company offers its penis extended in one of five traction kits, from a relatively limited starter edition to the company’s X4 Extender Gold Premium edition, which includes stronger tensions springs and a range of extra bonus products. All packages include comfort pads to reduce the risk of injury and a basic instructional CD to help customers learn to use the product correctly. Special extenders and extender parts are available for people who have exceptionally small or exceptionally thick penises, but these come at an additional cost to the purchaser.

How It Works

Traction-based devices like the X4 Labs extender work by constricting the penis and gently pulling it outward. When used correctly, they can increase the size of the internal cavities in the penis, producing a larger erect organ. They may also help increase blood circulation to the penis, increasing overall penile health. Weighted springs help provide consistent pressure and automatic length adjustments, even if an erection occurs while the extender is in place.

A study published in the March 2009 issues of BJU International showed that traction-based penis extenders provided their wearers with an increase in the flaccid length of up to 33 percent. This improvement occurs in patients who wore the devices for between four and six hours per day for six months to a year. Traction-based extenders offer less improvement in girth, but cardiovascular benefits from the device may help wearers enlarge the diameter of their penis rather than just the length.

Only a very small percentage of study participants experienced any significant discomfort or side effects, making this a safe option for many people. This study showed that men who do not technically qualify for enlargement surgery can still gain nonsurgical benefits from extender devices.


X4 Labs advertises the penis extender based on a number of benefits. These include:

  • Ability to increase length and girth by several inches

Safe for men of all ages

  • Clinically tested
  • Used by surgeons and other medical professionals
  • Business has been established for over a decade
  • The extender is adjustable to accommodate penis growth via spare parts
  • Includes instructional DVD and discreet storage box
  • 24/7 customer support
  • Free shipping in the UK, Canada, and the U.S.
  • Durable product
  • Discreet packaging and shipping
  • Comfort strap
  • Extended guarantee


Like most other health products, the X4 Labs extender isn’t perfect. It comes with a few disadvantages of which customers should be aware before they make a purchase. These include:

  • Extra cost to accommodate thick penises or those shorter than four inches
  • Not available in retail stores
  • Traction devices can cause penis damage if misused

 Bonus Offers

The X4 Labs extender comes with several bonus products for customers who choose the more advanced packages. These include a bonus $50 X4 Labs gift certificate, a DVD collection that provides tips to improve sexual performance and enjoyment, and access to more than 30 exercise videos intended to provide increased stamina and penis size.

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