Is KSI On Steroids? | Natty or Not

Dr. Mike Jansen

Last Updated December 17, 2022

Dr. Mike Jansen

 December 17, 2022


Is KSI on steroids?

Then you’ve come to the right place. Inside, you’ll find the official breakdown of whether or not KSI has ever used gear before…

KSI is a British YouTuber, rapper, and professional boxer.

He is famous for his incredibly popular gaming videos, and of course, for beating Logan Paul in a professional boxing match.

Some people have accused KSI of using anabolic steroids. This is understandable, as KSI is one of the biggest and strongest professional boxers in the world.

Is KSI natty? Or did he use anabolic steroids to prepare for his fight against Logan Paul? Let’s find out!

Disclaimer: The contents of are for informational and educational purposes. We do not provide legal advice. Likewise, we do not provide medical advice, diagnosis, or treatment. Please consult your physician prior to consuming any over-the-counter supplements, like a natural testosterone booster, and/or getting a prescription for a pharmaceutical medication. Your access to is subject to our full disclaimer and terms of use.

KSI Stats

Age: 29 Years Old
Height: 6’0”
Weight: 187 Pounds
Estimated Body Fat %: About 10 Percent
Nickname: The Nightmare

What Are Steroids?

Steroids are one of the most controversial topics in the fitness industry.

The truth is, steroids are just man-made chemicals that mimic the effects of testosterone in the human body.

They were originally developed by researchers to treat men suffering from low testosterone levels and different muscle-wasting diseases. However, many men choose to use steroids as a “performance enhancing drug” [1]. The truth is, steroids have the following benefits [2]:

  • Increased muscle mass
  • Increased muscle strength
  • Faster recovery from workouts
  • Faster recovery from injuries
  • Improved cardiovascular endurance

As you can see, anabolic steroids are extremely beneficial for bodybuilders and other athletes.

Unfortunately, they also have many dangerous side effects. Some people have died following long-term steroid abuse, while others have damaged their internal organs, such as their heart, liver, and kidneys [3] [4].

Anyone interested in anabolic steroids should perform extensive research before experimenting with these potentially dangerous drugs.

KSI Steroids

Signs of Steroid Usage

Can you really tell if someone is using anabolic steroids just by looking at them? It’s hard to say for sure. However, most long-term steroid users have specific side effects that you can look for.

Here are some of the most common side effects of long-term steroid use:

  • Round / Bloated Stomach
  • Massive Shoulders / Traps
  • Massive Head / Skull
  • Rapid Body Transformation
  • Yellow / Oily Skin

Let’s take a closer look at each of these side effects.

One of the most common signs of steroid use is a round / bloated stomach. This is caused by long-term insulin or growth hormone use, as these drugs cause the large intestine to grow in size.

This causes the user’s stomach to puff out, even when they are completely shredded. Just think of Joe Rogan and his “growth hormone gut!”

Another key sign of steroid use is massive shoulders and traps. These muscle groups have a large number of androgen receptors, and they grow extremely quickly when someone uses gear. It’s also very hard for a natural trainee to build massive 3-D delts.

If you see someone with massive shoulders and traps, then they may be using gear.

Other signs of steroid use include a massive head / skull, a rapid body transformation, or yellow / oily skin. If you see someone with some or all of these signs, then they are probably using anabolic steroids.

Is KSI On Steroids?

Is KSI natty? Or does he use anabolic steroids to prepare for his professional boxing matches? Let’s look at the facts before jumping to any conclusions.

KSI has the following signs of long-term steroid use:

  • Rapid body transformations
  • Insanely muscular physique
  • Completely shredded

Let’s take a closer look at each of these signs.

KSI is known for his rapid body transformations. In 2022 he pulled of one of his craziest physique transformations, going from “Dad bod” to “God bod” in just a few months!

It’s rare to see someone completely transform their body in such a short period of time. However, KSI can do it pretty much whenever he wants.

It’s also a little suspicious that a professional boxer can let themselves get so out of shape in between fights, and then turn things around immediately when getting ready for a fight…

KSI also has an insanely muscular physique – when he decides to get in shape, that is.

He has ripped six pack abs and an extremely muscular upper body. His chest and shoulders pop off his body, and his arms and back are also extremely well developed. It’s pretty rare to see a natural athlete with this level of muscular development.

It’s not a smoking gun, but it definitely adds to our suspicions…

Finally, KSI is also completely shredded. He has visible six-pack abs, and he can maintain this physique pretty easily.

Most natural athletes have a hard time staying this lean year-round, as their testosterone levels start to decline when they get to lean.

However, KSI makes it look easy.

So what does KSI have to say about these accusations?

In one of his YouTube videos, KSI directly denied using steroids. He says that good old fashioned hard work is the key to his success.

“It’s crazy that people think I take shit. The only thing I’m taking is a hard work pill baby!”

But is this really the case?

As far as I can tell, KSI has been drug-tested before all of his professional boxing matches, and he never tested positive for anabolic steroids.

Based on the available evidence, it looks like KSI is 100% natty… or at the very least, there just isn’t enough evidence to say that he is using drugs.

KSI Before And After Steroids

KSI has many of the usual signs of long-term steroid use, including his rapid body transformations, insanely muscular physique, and his shredded abs.

But did he always look this way?

The truth is, KSI spends most of the year looking like an “offseason” athlete. In fact, when he is not getting ready for a fight KSI looks like a regular couch potato! However, when he needs to prepare for a boxing match he quickly gets back into peak physical shape.

This definitely makes us suspicious of KSI using performance enhancing drugs…

KSI steroids before and after

Legal Steroid Alternatives?

Many professional and amateur athletes choose to use anabolic steroids. However, that doesn’t mean they are a good idea for everyone.

Steroids have many dangerous side effects, and are illegal in most developed countries.

Fortunately, there are natural “over the counter” products that you can use to make faster progress in the gym. Some people call these products “legal steroid alternatives,” because they mimic the effects of traditional anabolic steroids.

Based on our research, the most effective legal steroid alternative on the market today is called turkesterone.

Turkesterone belongs to a family of natural plant steroids called ecdysterone.

Don’t worry – turkesterone is NOT an anabolic steroid. It doesn’t impact your testosterone levels or other hormones, which means it has virtually zero side effects.

Turkesterone works by directly increasing protein synthesis levels inside your muscle cells. Research shows that turkesterone boosts protein synthesis levels by as much as 20%, and may work even better than dianabol [5, 6]!

This sounds too good to be true, but thousands of verified customers are already getting great results with turkesterone.

If you are ready to get started with turkesterone, then we strongly recommend the brand Swiss Chems. They make all of their products in HPLC regulated facilities, so you know you are getting a premium quality product.

And that means faster gains in the gym!

If you are ready to get started with Swiss Chems turkesterone, then click here.

Testosterone Therapy vs Steroids

Testosterone replacement therapy is one of the most important treatment options for men suffering from low testosterone levels.

Many men find that it completely transforms their physical, mental, and sexual health.

Here’s how it works: if your doctor agrees you have signs and symptoms of low T, then he will order a comprehensive blood test to measure your hormone levels. Next, he will build a customized treatment plan to help you optimize your testosterone levels.

Here are some of the proven benefits you can expect with TRT [7, 8, 9]:

  • A Leaner, More Muscular Physique
  • Faster Recovery From Workouts
  • Increased Energy Levels
  • Stronger Immune System
  • Improved Cardiovascular Health

No wonder millions of men around the world are getting started with testosterone replacement therapy!

Don’t worry – TRT is perfectly safe. Unlike anabolic steroids, testosterone therapy is designed to optimize your natural testosterone production. This means you don’t have to worry about the dangerous side effects associated with steroids.

If you are ready to get started with testosterone therapy, then we recommend working with a great online TRT clinic like Fountain TRT.

Get hormone therapy today with Fountain TRT...

KSI and Steroids | Verdict

What’s the verdict – does KSI use steroids?

We believe the odds are low that KSI used anabolic steroids to ger ready for his professional boxing matches.

KSI has some of the usual signs of long-term steroid use, such as an extremely muscular physique and rapid body transformations.

However, KSI’s physique is still 100% achievable by a natural trainee, and he has never tested positive for steroids in his drug tests.

We still have our suspicions about KSI and possible steroid use. However, based on all of the evidence, we believe KSI is 100% natty.

This means you can’t use your “natty status” as an excuse for why you aren’t jacked like KSI!


  1. Sagoe D, Molde H, Andreassen CS, Torsheim T, Pallesen S. The global epidemiology of anabolic-androgenic steroid use: a meta-analysis and meta-regression analysis. Ann Epidemiol. 2014 May;24(5):383-98. doi: 10.1016/j.annepidem.2014.01.009. Epub 2014 Jan 30. PMID: 24582699.
  2. Pope Jr HG, Kanayama G, Athey A, Ryan E, Hudson JI, Baggish A. The lifetime prevalence of anabolic‐androgenic steroid use and dependence in Americans: Current best estimates. The American journal on addictions. 2014 Jul;23(4):371-7. doi: 10.1111/j.1521-0391.2013.12118.x. PMID: 24112239.
  3. Andrews MA, Magee CD, Combest TM, Allard RJ, Douglas KM. Physical Effects of Anabolic-androgenic Steroids in Healthy Exercising Adults: A Systematic Review and Meta-analysis. Curr Sports Med Rep. 2018 Jul;17(7):232-241. doi: 10.1249/JSR.0000000000000500. PMID: 29994823.
  4. Albano GD, Amico F, Cocimano G, et al. Adverse Effects of Anabolic-Androgenic Steroids: A Literature Review. Healthcare (Basel). 2021;9(1):97. Published 2021 Jan 19. doi:10.3390/healthcare9010097.
  5. Dinan L, Bourne P, Whiting P, et al. Synthesis and biological activities of turkesterone 11alpha-acyl derivatives. J Insect Sci. 2003;3:6. doi:10.1093/jis/3.1.6
  6. Parr MK, Botrè F, Naß A, Hengevoss J, Diel P, Wolber G. Ecdysteroids: A novel class of anabolic agents?. Biol Sport. 2015;32(2):169-173. doi:10.5604/20831862.1144420
  7. Al-Zoubi RM, Yassin AA, Alwani M, Al-Qudimat A, Aboumarzouk OM, Zarour A, Al Ansari A. A systematic review on the latest developments in testosterone therapy: Innovations, advances, and paradigm shifts. Arab J Urol. 2021 Aug 8;19(3):370-375. doi: 10.1080/2090598X.2021.1959260. PMID: 34552788; PMCID: PMC8451690.
  8. Kim SH, Park JJ, Kim KH, Yang HJ, Kim DS, Lee CH, Jeon YS, Shim SR, Kim JH. Efficacy of testosterone replacement therapy for treating metabolic disturbances in late-onset hypogonadism: a systematic review and meta-analysis. Int Urol Nephrol. 2021 Sep;53(9):1733-1746. doi: 10.1007/s11255-021-02876-w. Epub 2021 Jun 5. PMID: 34089171.
  9. Lunenfeld B, Mskhalaya G, Zitzmann M, Corona G, Arver S, Kalinchenko S, Tishova Y, Morgentaler A. Recommendations on the diagnosis, treatment and monitoring of testosterone deficiency in men. Aging Male. 2021 Dec;24(1):119-138. doi: 10.1080/13685538.2021.1962840. PM
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