Doping In MMA – How Much Of An Advantage Does It Give A Fighter?

Performance-enhancing drugs (PED’s) - the mosquito of MMA. Ignorantly buzzing in the background evading capture but when finally caught, another incessant buzz emerges as the authorities feel powerless to prevent it from sucking the integrity out of the sport.

In recent years, the US Anti-Doping Agency (USADA) have made huge efforts to extinguish the mosquito and eradicate the use of PED’s. They have clearly outlined prohibited substances in and out of MMA competition and enforced compulsory random testing for fighters. A positive test or failure to produce a sample will result in a ban of varying length.

Back in the early days of the UFC and most likely the entirety of Pride (Japanese promotion), it was common for a fighter to be juiced to the gills. With barely any testing, the use of PED’s was rife and not even well hidden. Fighters sought a competitive advantage and got away with it. Now with stricter regulations and testing with lengthy bans, the vast majority of MMA promotions are slowly but surely becoming an even and clean playing field.

I wanted to investigate how much illegal substances have actually enhanced performances. So I have gathered data on every notable fighter that has been sanctioned and have compared their record before and after their ban along with providing a table of information on each fighter. This is just for visual purposes and does not imply that fighters were using PED’s all the way up until their ban and also does not imply that they have been clean after the ban for that matter.

Before and after doping ban
Fighter bans

So as you can see, there is a stark difference in the performance of these fighters before and after they were caught and subsequently sanctioned. The average win percentage before the ban was 78% and after it dropped to a staggering 45%. Just by glancing at the amount of losses after their ban and the drastic decrease in win percentages, surely proves that juicing gives you a significant advantage. What must be taken into account of course, is the difference in sample sizes, as there have been far more fights in the ‘pre-ban’ category compare to ‘post-ban’, potentially skewing the results somewhat. However, we have to consider other factors.



MMA fighters have a very short shelf-life compared to other athletes and tend to peak later in their careers with even the best fighters in the sport not enduring consistent form until retirement. Just look at Anderson Silva who has been imperious in the UFC. His form already started to deteriorate before he got popped but he was 37 years old at the time which is a long innings for a fighter competing at the highest level. The harsh reality for a fighter is that their performance can fall off a cliff. Constant blows to the head and debilitating injuries throughout a career makes them very vulnerable as they get older, especially as the level of competition continues to rise in MMA.

So you could say it is natural for a fighter to lose more fights as they get older? Yes, but by looking closely at their records, the form of several fighters dropped suddenly after their ban and the difference in win percentage makes it hard to argue that it is just a coincidence.         

2016    - Anderson Silva (right) receiving his third UFC loss against Michael Bisping.

2016 - Anderson Silva (right) receiving his third UFC loss against Michael Bisping.


Ring-rust is also an issue for fighters. It can be tremendously difficult for a fighter to resume any kind of form when sidelined for months/years at a time, whether it be due to injury or a lengthy ban. There is no room for error in combat so when not competing for a significant amount of time, they will not return the same, mentally and physically which may explain the dip in form or lack of confidence at least when returning to competition. There are fighters however who have not seemed to display any ring-rust such as; Dominick Cruz who took years out of the game due to several injuries but still came back to reclaim his belt against the highest calibre of opponent in TJ Dillashaw.

We can speculate why performance levels may drop in a fighter. In all likelihood these factors do contribute but are mainly an excuse to resort to PED’s. So when their form drops immediately after a ban it is all too easy to assume they have previously been aided by PED’s.

One of a kind    – Dominick Cruz (right) reclaiming his belt against TJ Dillashaw

One of a kind – Dominick Cruz (right) reclaiming his belt against TJ Dillashaw

How long have they been dirty?

We also do not know how long fighters were using PED’s. We only know that they tested positive on the test that lead to the ban. So effectively, they could have been clean for their entire career up until getting caught. It is so hard to tell and every fighter differs – and every substance for that matter. There have also been a couple occasions when fighters tested positive but claimed that legal substances they consume were actually contaminated with illegal substances. Tim Means and Yoel Romero had their bans shortened as they were deemed not to have known they were consuming a banned substance. This is a very complex issue in sport that is only just being addressed so there is always going to be grey areas.

So how can we tell if a fighter is doping?

Blood/urine tests are the only definitive proof and is why the sport relies so much on governing bodies such as USADA to eradicate the dopers. Occasionally we can physically see differences to a fighter’s physique that would suggest they are not on the most natural of diets. There are many fighters that are naturally yolked but abnormal levels of Human Growth Hormone and Testosterone for example, can turn well conditioned athletes into chiselled beasts. They can put on substantial muscle mass, increasing power as well as their speed. Vitor Belfort and Alistair Overeem are the best illustration of how the body can change when coming off these substances:

Vitor Belfort:    Before (2012) and after ban (2017) -  Getty Images

Vitor Belfort: Before (2012) and after ban (2017) - Getty Images


Alistair Overeem: Before (2011) and after ban (2017)

As mentioned, every fighter and substance is different and it is extremely hard to know when/how long they were taking PED’s as well as the effect they had on their performance. In general, the ‘before and after records’ suggest that a fighter clearly has an advantage when sailing on the ship of steroids. However, there appear to be exceptions:


Cris Cyborg

CCyborg has won every fight since testing positive for Stanozolol after her victory over Hiroko Yamanaka in 2011. She is clearly an impressive specimen with elite level skills racking up a terrifying 15 knock outs from her 17 wins. However, she has more power, muscle mass and speed than virtually any female fighter in the world and is quite frankly a mutant. So when she got popped, nobody was surprised. That said, her performances since her ban if anything, have improved – putting all her seven victims to sleep. Although she looks slightly less freakish now, she was flagged for a potential violation by USADA in December 2016 but she was granted retroactive therapeutic use exemption thus making her illegible to compete.

Exemptions create a whole new controversial area where fighters are allowed to take illegal substances for medical reasons. Whether this is fair or not is up for debate – what is not up for debate is that Cyborg is a monster.


Mirko Cro Cop

In 2015, Cro Cop received a ban for testing positive for Human Growth Hormone and his UFC contract was subsequently terminated. However since his ban, he has also won every fight since but instead of picking up wins in the UFC where fighters are stringently tested, these fights took place under the new Japanese promotion called Rizin. It is hard to imagine there is much testing – if any in this promotion as it seems more of a circus than an MMA organisation.

Left:    Pre-ban (2014 v Gonzaga)                               Right:  Post-ban (2016 Rizin tournament)

Left: Pre-ban (2014 v Gonzaga)                              Right: Post-ban (2016 Rizin tournament)

Brian Ortega   

Another fighter who has enjoyed an unbeaten streak since his ban. Ortega tested positive for Drostanalone after his victory over Mike De La Torre in 2014 but this is an odd case. He was only 22 years old when he got caught after his UFC debut and certainly does not look like he was on any gear leading up to this fight. He is a gifted and skilled athlete who has never lost a fight and resorting to the juice is something he will always regret as it appears it was never even needed.

Left:    Pre-ban (2014 v Mike De La Torre)                          Right:  Post-ban (2016 v Clay Guida)

Left: Pre-ban (2014 v Mike De La Torre)                         Right: Post-ban (2016 v Clay Guida)

Unmentioned Fighters

There are a few fighters that we have not mentioned. Showing the records of repeat offenders such as Josh Barnett, Chael Sonnen and Stephen Bonnar would not give an accurate representation of how PED’s affected their performance as there is no way of telling when they were clean and not. There are also a batch of notable fighters who are currently serving a suspension/completed their ban but yet to return. See below for details:

Currently banned fighters

We will be sure to keep a close eye how the fighters fair on their return.

So do fighters have an advantage when using PED’s?

Of course they do. This was never a serious question but an excuse to discover quite how much of an advantage they get and illustrate the difference in individual cases. Although doping in MMA is such a grey area, we are becoming more informed and importantly, more efforts are being made to clean up the sport thanks to organisations such as USADA and the UFC. Lengthy bans are a must as it can have a huge impact on the career of a fighter and they seem to be making a difference but more appropriate sanctions still need work.

Long bans are a good start but steroids can have permanent effects on the human body and although fighters may be clean, they have already reaped the benefits of PED’s – physically as well as their fight record so stricter sanctions have to be considered in the interest of making the sport fairer.

There will always be parts of the world and MMA promotions that do not impose any testing. This allows freak shows and behemoths with unsettling vascularity to compete in combat against other human beings which borders on the inhumane. But there is an argument as to whether this is even a bad thing or not. MMA is a sport with promotions that solely want to provide entertainment and generally that is all the fans want. We can let these mosquito’s buzz in bliss but as long as the top organisations are doing all they can to promote fair competition the sport of MMA will continue to grow.