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SizeGenetics Reviews: Will it really work for penis enlargement?

We test and study whether SizeGenetics will give you the size advantage you’re looking for

Last Updated: Jan 4, 2023
Sizegenetics Reviews

If you’re insecure about the size of your penis, you’re in good company — studies show that men of every age and background are nervous that their equipment doesn’t measure up to their peers. For many people, it creates a sense of dread that you really ought to be bigger, or else your partners will be left sexually unsatisfied. It doesn’t help that this insecurity is reinforced by media, cultural mores, and even other men (who are also insecure).

There are about as many touted penis enlargement techniques as there are men looking for them. Many companies are just trying to sell you a bill of goods, while some of them are genuine articles and will help you permanently increase your penis size.

SizeGenetics is one product that claims to help you lengthen, thicken, and correct the curvature of your penis and even help you achieve harder erections. But can you trust them? Does this device work? Our testers examined all the aspects of the experience to give you the answers you need.

Editor's Summary

Editor's Summary

Overall Rating 7.9 / 10

SizeGenetics offers a device that works. If you use it as directed, it will lengthen your penis, and you may also experience an increase in girth. The science is sound, and the design and durability of the traction system are among the best in the business.



  • Requires extensive use
  • Might snag pubic hair if untrimmed
  • Metal bars can be uncomfortable
  • Poor customer service
Our Top Picks


SizeGenetics is a trusted and scientifically backed option for men who want penis enlargement but don’t want to go under the knife.

There are many customized solutions offered as both individual products and packages that take into account your desired effect and daily routine. With a money-back guarantee, SizeGenetics’ proven method promises results.

Value Edition
Reviewed by Innerbody Research
Comfort Package
Reviewed by Innerbody Research
Curvature and Peyronie's
Reviewed by Innerbody Research
Ultimate System
Reviewed by Innerbody Research

Why you should trust us

At Innerbody Research, we extensively test each health service we review, including SizeGenetics. All told, our testers and team have collectively spent thousands of hours testing and researching SizeGenetics and its competitors to provide an accurate, unbiased analysis of how they stack up, free of marketing jargon and gimmicks.

Over the past two decades, Innerbody Research has helped tens of millions of readers make more informed decisions to live healthier lifestyles. We evaluate the service based on adherence to quality, the latest medical evidence and health standards, and a simple question: would we buy the product or service ourselves if it weren’t part of our job, and would we recommend it to family and friends?

Additionally, like all health-related content on this website, this guide was thoroughly vetted by one or more members of our Medical Review Board for accuracy.

What is SizeGenetics?

SizeGenetics has been around since 1995, and in that time, they’ve established themselves as a reputable and scientifically sound option for penis enlargement that doesn’t require surgery. They offer a range of penis extenders and accessories, both individually and in complete kits, all of which come with a money-back guarantee if you’re not completely satisfied with the services they have to offer. There’s a range of versatility in their products, and SizeGenetics gives you the freedom to customize the exact penis enlargement routine that works for you.

Their product line includes the following:

  • Value Edition
  • Comfort Package
  • Ultimate System
  • Peyronie’s Disease Home Treatment
  • Various parts and accessories

Among their available parts and accessories, SizeGenetics offers anything you could need to repair or replace any portion of your device. They also sell various comfort enhancements and an arousal gel for use during intercourse.

Is SizeGenetics legit?

You can’t always be sure that penis enlargement therapies and products will deliver on their promises. Still, in SizeGenetics’ case, the answer to whether or not you can trust them is a resounding yes. The devices take advantage of penis traction, a proven method of enlarging and strengthening penis tissue by stretching it using suspension devices that hold it in place. At the same time, your body enacts the same cell regeneration processes at the heart of weight training. Traction doesn’t bring miraculous gains in short periods — it takes consistent use and patience, but if you stick with it for months, SizeGenetics pays dividends.

How does SizeGenetics work?

SizeGenetics’ penis extenders use a system of elongation bars and straps to create traction, which causes microscopic tears in the tissue of your penis over time. Similar to how your body builds muscle repairing microtears after a workout, your penis also enlarges as your body repairs these microtears.

The process goes like this:

  1. Measure your penis. Before strapping in for the first time, you’ll measure your penis in its flaccid state but stretched out. Don’t pull too hard — just enough that it feels fully extended.

  2. Set up the device. Use small thumbscrews at the base of each arm, so there’s a tiny gap between them and the base. Then, attach enough extension bars so that the length of the device from the base to the end of the bars is 1cm longer than your stretched flaccid penis. After that, insert each end of the strap one notch into the slots in the rest.

  3. Put on the device. Slip your penis through the base and gently guide your head through the loop created between the rest and strap. You will need to compress the spring bars slightly here. Tighten the strap comfortably around the head of your penis using the included comfort material for protection. The spring bars will expand and gently stretch your penis when you release the rest.

  4. Add tension. You can add extra tension by turning the thumbscrews at the base. The more you turn, the more tension you add to a session. If you see the threads of the screws, you’ve gone too far. Go back and add more elongation bars, then try again.

  5. Wear it. Once you achieve a comfortable stretch, you’ll wear the device for several hours daily, with occasional days off for rest and recovery. Keep this up for several months, and you can attain permanent results.

Insider Tip: Despite using protection pads, gauze, or other comfort material, the device will feel very awkward for the first several uses. We recommend putting it on and taking it off at least three times with each use for the first week. The faster you get used to applying it, the easier to stick with your program.

Does SizeGenetics work?

SizeGenetics’ products are effective when you use them properly for at least 12 weeks. For the best results, it’s essential to wear the SizeGenetics device for at least a few hours each day. Its intuitive design means you can wear the device pretty comfortably for much of the day, even underneath clothing, without people knowing that you’re wearing it.

Many users report gains of up to 1.5 inches after eight months of use, and you’ll see short-term gains too, though these will be temporary if you suspend your program early.

Products and prices

Remember that SizeGenetics is based in Europe as you consider making a purchase. Because of this, shipping to the US costs a flat rate of $19 – an unavoidable addition to the overall price.

Sizegenetics Parts

Here’s a quick look at SizeGenetics’ product lineup:

  Value Edition Comfort Package Ultimate System Peyronie’s Home Treatment
Price $199.95 $249.95 $299.95 $299.95
Maximum extension 6.6” 9.1” 9.1” 9.1”
Travel case    
Extra comfort accessories  
Maximum tension 2,800g 2,800g 2,800g 2,800g

Value Edition – $199.95

The Value Edition is SizeGenetics’ most affordable package, and while it doesn’t have some of the accessories of more comprehensive packages, it has everything you need to get started:

  • SizeGenetics device
  • One-year warranty
  • Product case
  • Dual-function front piece
  • Comfort strap
  • Protection pad
  • Two elongation bars (1in/2.5cm)
  • Two elongation bars (2in/5cm)
  • Quick start guide

Comfort Package – $249.95

The Comfort Package has everything included in the Value Edition and adds a few extras:

  • SizeGenetics device
  • One-year warranty
  • Luxury leather case (with key)
  • Dual-function front piece
  • Silicone tube
  • Comfort strap
  • Protection pad
  • Two elongation bars (1in/2.5cm)
  • Four elongation bars (2in/5cm)
  • Two elongation bars (0.5in/1.25cm)
  • No-slip Protech
  • 3M advanced comfort plaster
  • Quick start guide

Ultimate System – $299.95

The Ultimate System contains everything in the comfort package and adds a travel case, moisturizer, and talcum powder. The moisturizer and talcum powder would normally cost $48 to purchase, so you’re essentially getting the travel case for free at this level. Together, the whole kit includes:

  • SizeGenetics device
  • 1-year warranty
  • Luxury leather case
  • Dual-function front piece (with extra)
  • Silicone tube (with extra)
  • Comfort strap
  • Protection pad
  • Two elongation bars (1in/2.5cm)
  • Four elongation bars (2in/5cm)
  • Two elongation bars (0.5in/1.25cm)
  • One set of keys
  • No-slip Protech
  • 3M advanced comfort plaster (with extra)
  • Quick start guide
  • Bottle of Accellerate Cream Moisturizer
  • Bottle of Accellerate Traction Talcum Powder

Peyronie's Disease Home Treatment – $299.95

The Peyronie’s Disease Home Treatment kit is ideal for users who suffer from curvature of the penis, discomfort from erections, lack of libido, or weak erections. It includes:

  • SizeGenetics device
  • 1-year warranty
  • Luxury leather case
  • Two Dual-function front pieces
  • Three Silicone tubes
  • Comfort strap
  • Protection pad
  • Two elongation bars (1in/2.5cm)
  • Four elongation bars (2in/5cm)
  • Two elongation bars (0.5in/1.25cm)
  • One set of keys
  • No-slip Protech
  • Two 3M advanced comfort plasters
  • Quick start guide
  • Gauze


SizeGenetics allows you to purchase any part of the base device, so if something goes wrong outside your one-year warranty period, you can inexpensively fix it without having to buy a new one. The company also sells additional comfort accessories you can sometimes find in their various packages.

These available accessories include:

Accellerate moisturizing cream

Stretching the penis affects the skin as readily as the cavernous tissue beneath it. This moisturizer can reduce dryness and soothe skin that may chafe against the device after hours of use.

Accellerate talcum powder

To prevent chafing in the first place, you can apply a small amount of talcum powder to your penis before stretching sessions. Remember, though, that talcum powder bears a link to reproductive issues in the ovaries. Even if those effects don’t translate to you, you’ll want to clean yourself thoroughly before intercourse.

Accellerate Boost

This multivitamin supplement contains folate, iron, zinc, and vitamins D and B12. While not directly related to penis enlargement, these elements may play a significant role in repairing damaged tissue and building new cells.

Accellerate disinfectant spray

You must keep your device clean, given the length and frequency of its use. This disinfectant spray can prevent bacteria, yeast, and fungus from endangering your penis.

Zestra Essential Arousal Oil

This oil-based compound can increase a woman’s arousal and enjoyment of sex. You can apply it during foreplay and expect results to last up to 45 minutes. Be careful if you’re using latex condoms, however. Like oil-based lubricants, Zestra can damage latex, potentially increasing the risk of pregnancy or STD transmission.


This handy device doubles as a ruler and protractor, with the ability to measure up to 16 inches and 180 degrees. Use it to track your progress and accurately set your device length before your sessions.

Payment, shipping, and insurance

SizeGenetics accepts major credit cards and payments through PayPal. UK customers can utilize wire transfers, as well. One annoying part of the checkout process is that the system makes you enter your billing address twice, so be ready to do that.

Because the company’s headquarters are in London, shipping to the US costs $19. As frustrating as that may be, it is a fast shipping process. Our testers bought their devices on 10/14 and received them by 10/19.

Don’t expect your insurance to cover a purchase through SizeGenetics. Most companies would consider this an elective cosmetic procedure. Still, if you have a clinical Peyronie diagnosis, you might be able to make an out-of-network claim with your insurer and recoup some of the cost that way.

Privacy considerations

SizeGenetics does a fine job of protecting your personal information.

  • All shipments arrive in featureless boxes for discretion
  • SizeGenetics will never collect or distribute any financial or personal details
  • Payment through the website with a card or PayPal is secure

SizeGenetics FAQ

Is SizeGenetics safe?

SizeGenetics is perfectly safe and comfortable to use. The key to maintaining a healthy and pleasant penis-enlarging routine is to listen to what your body is telling you — if circulation to your penis is cut off or you experience a level of discomfort beyond gentle stretching, recalibrate and try again. Gains won’t happen overnight, and it’ll take patience to see the significant results you want. Still, as long as you follow the comprehensive instructions included with SizeGenetics kits, you’ll be in great shape.

How long until you see results?

While using SizeGenetics for 5-6 hours per day, most users report seeing a 10% increase in growth in the first two to three months. This isn’t necessarily long-term growth, however; continuous use for six months can produce growth of up to 28% in length and 19% in girth. Using the device for several months is the key to seeing a permanent increase in size.

Does penis extension hurt?

Penis extension should not be painful. You may experience some mild discomfort from your first protracted stretching sessions when you first start. Still, if you take the appropriate breaks throughout the day and don’t push beyond SizeGenetics’ recommendations, you should be fine. If you notice any bruising, significant pain, or sensitivity, you may be misusing your device. Double-check the manual and your device’s settings, and reach out to the company for added guidance.

How SizeGenetics stacks up against the competition

SizeGenetics is just one of many penis extension devices on the market. There are dozens to choose from, and we’ve broken the field down to its most essential players in a complete guide. In the meantime, here’s a snapshot of some of the top competitors.

Quick Extender Pro

Quick Extender Pro offers a remarkably similar device to SizeGenetics, but that our testers found a bit easier to use. Instead of turning a handscrew to dial in tension, its spring system affords tension based on the addition and subtraction of extension rods. That results in more consistency throughout your program. And given that their prices are similar and that Quick Extender Pro has superior customer service, we recommend starting with them for most men. Check out our complete Quick Extender Pro review for more.

PeniMaster Pro

PeniMaster Pro offers some of the best comfort features in the business and is our favorite device for vacuum-based traction. That said, the device is more expensive and more complicated to use than SizeGenetics or Quick Extender Pro. One big benefit of vacuum-based traction is that it may have a more significant effect on girth than simple stretching. If you’re that concerned about the thickness of your penis, you might want to take a look at our PeniMaster Pro review for more information.


If you’re looking to test the waters without spending too much money, MaleEdge offers a moderately effective budget option. Its initial tension is lower than much of the competition, which means it will take longer to yield results. That also means that you’re less likely to encounter any bruising or adverse side effects that you might get from applying too much tension early in your routine. Ultimately, its build quality isn’t the best, so we’d advise you to stick with something like Quick Extender Pro instead.

Jes Extender

Moving gradually through extension bar lengths is key to a successful, pain-free process. Jes Extender offers a decent product, but their extension bars adjust in 0.5-inch increments, which can be too large a jump for some users. Even worse, their emphasis on a luxury aesthetic makes them an irresponsibly expensive choice, considering that their quality is on par with the likes of SizeGenetics and Quick Extender Pro.

Phallosan Forte

This is a complicated piece of equipment. Phallosan Forte comes with a lot of parts — some of which you’ll never use if your penis is already a certain girth. Its instructions are difficult to comprehend, and it’s a little on the expensive side. All that said, it is remarkably comfortable and effective. If you have the budget, time, and energy to devote to it, you’ll likely be pleased. But other options are more straightforward and just as useful.

How we evaluate SizeGenetics

At Innerbody Research, we customize our evaluation criteria depending on the type and nature of the health-related service or product. For SizeGenetics and other health products, we have several areas that we use for our evaluations, including:



There’s no denying that SizeGenetics works if you use it properly. With a minimum 12 weeks of consistent treatment, you should see permanent gains in length and girth. Traction methods pass test after test in the scientific literature, and positive side effects like increased erection strength and orgasm intensity far outweigh common adverse reactions like mild discomfort.



In general, penis extension devices are a good value. Men would likely have offered thousands for a guaranteed way to increase the size of their penises, but these devices generally cost in the low hundreds. For SizeGenetics, the price is fair. Some of the companies offer a little more for a little less. Still, the SizeGenetics packages — especially the value edition — give you everything you need to get started for a reasonable cost. And if you start with the value edition and add extension rods as you go, you’ll find that SizeGenetics prices these accessories reasonably.



The SizeGenetics device itself is relatively simple, so you can trust it to be durable. Its design makes for a straightforward application, and once you get used to using it, you’ll find it’s easy to put on and take off. The storage case in all the tiers above the value edition is a nice touch, especially as it features a lock to keep anyone from discovering its contents. While we wouldn’t rate the device best-in-class, it does beat out most of the competition.



A lot about the SizeGenetics experience is convenient. The device is easy to use, and the website is easy to navigate. The purchasing process is fast and painless. Shipping is quick, too. But since we’re dealing with a very sensitive body part, the included instructions must be as clear as possible, and they are not. The poorly worded instruction booklet is often at odds with the video that SizeGenetics hosts on their website. This forces you to take extreme caution and slowly figure out how to use the device safely and effectively, minimizing the convenience we see everywhere else.



SizeGenetics protects your privacy in the real world by shipping your devices in packages that don’t give away what’s inside. You also won’t see anything to do with SizeGenetics or penis extension on your credit card bill.

The company protects your privacy online by safeguarding your personal information in a secure database for your convenience and their tax purposes. After five years, the system automatically deletes your data. Like many companies, SizeGenetics uses cookies and analytics to track how you use the site and improve their pages advertising. Unlike most companies, they have a link to a guide on deleting cookies should you wish to do so.

Customer support


Our testers were extremely disappointed with SizeGenetics customer support. Their phone banks are non-existent; we waited more than an hour multiple times and never got through to anyone. When the company shipped one of our testers an incomplete product (missing extension rods), they didn’t initially believe us. Then, they made us jump through warranty hoops and fill out forms to get the rods shipped to us instead of owning up to their mistake and simply creating the shipment then and there. All told, the process took over a week, not counting the shipping time to receive the rods. Fast email responses and an occasionally accessible chat option on their site add some level of support, but this is SizeGenetics’ Achilles’ heel.

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