Is Mark McGwire On Steroids?

TRT Trey

Last Updated August 28, 2022

TRT Trey

 August 28, 2022


Is Mark McGwire on steroids?

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

Mark McGuire is one of the greatest baseball players of all time. He is most famous for hitting a record breaking 70 home runs for the Oakland Athletics in 1998. Mark McGuire finished his career with an unbelievable 583 home runs, a record that has only been surpassed by 4 other players.

Many professional baseball players have admitted to using steroids during their career, and you might be wondering if Mark McGuire is one of them. After all, he was over 250 pounds at his peak!

Is Mark McGuire really natural? Or did he use anabolic steroids to get an edge over his competition? 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.

Mark McGwire Stats

Age: 58 Years Old
Height: 6'5"
Weight: 225 lbs
Estimated Body Fat %: About 15 Percent
Nickname: "Big Mac"

What Are Steroids?

Steroids are man-made, or synthetic versions of testosterone, the natural male sex hormone. Anabolic steroids are used primarily by people who want to build muscle quickly, reduce recovery time between workouts, and boost athletic performance.

Steroids have a very similar chemical structure to natural testosterone. They promote muscle growth and develop secondary male sex characteristics, like a deep voice and facial hair.

Steroids are known as pumpers, roids, gym candy, stackers, or Arnolds [1].

Steroids were first synthesized in Germany in the mid-1930s. Initially, they were used to treat depression, induce puberty and stimulate appetite in young boys. Steroids were first used by athletes in the 1950s, when the Soviet Union began injecting their weightlifting team with them to improve their recovery time between workouts.

Steroids became increasingly popular in the 1970s and 1980s, and by the 1990s virtually every gym-goer could find them by the 1990s [2].

Anabolic steroids are very good if you want to build muscle, but users should pay attention to their adverse effects. Remember that the adverse effects occur after high-dose, long-term use. Common adverse effects are mainly related to heart disease and include high blood pressure, structural damage to the left ventricle, and arrhythmia.

Liver damage can also occur, especially if you take steroids orally.

Secondary side effects include hair loss, acne, infertility, erectile dysfunction, gynecomastia, stomach pain, and prostate cancer [3].

The bottom line is steroids are very effective at boosting athletic performance. Unfortunately, they also have many negative side effects, and they are illegal in many countries, including the United States.

Mark McGwire

Signs of steroid use

Steroids are popular among bodybuilders and other athletes who want to bulk up as fast as possible. If you want to spot a steroid user, then all you have to do is look for a few common signs in their physique.

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

  • Rapid Weight Gain
  • Flushed Skin
  • Mood Swings
  • Insanely Big Shoulders
  • Gynecomastia

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

Many steroid users experience rapid mood swings. They go from being calm and relaxed to incredibly angry in just a few seconds! This is also known as “roid rage,” and is a direct result of high testosterone levels.

Steroid users often experience bouts of anger, hypomania, and manic episodes [4].

Another common sign is overdeveloped muscle groups, like the traps and shoulders. These muscles have a large number of androgen receptors, so they often grow extremely fast when someone is using anabolic steroids [5].

One of the most feared signs of steroid use is gynecomastia, or “man boobs.” Gynecomastia is caused by estrogen dominance – the aromatase enzyme converts the excessive testosterone into estrogen [6].

There are other signs of steroid use, including rapid weight gain, red / flushed skin, and even a “Joe Rogan” gut that sticks out in front of the body.

If you see someone with most or all of these signs, then there’s a good chance that they are using steroids.

Is Mark McGwire on steroids?

Is Marc McGuire a natural athlete? Or did he use anabolic steroids to get an edge over his competition?

The truth is Marc McGuire doesn’t have any obvious signs of long-term steroid use. He doesn’t have an insanely muscular physique, a “growth hormone” gut, or even a “Joe Rogan skull.”

He just looks like a regular athlete who trained hard to max out his genetic potential. However, there is still plenty of evidence that Marc used steroids during his professional baseball career.

Marc McGuire’s steroid scandal exploded when John Canseco published his book “Juiced: Wild Times, Rampant ‘Roids, Smash Hits & How Baseball Got Big” in 2005.

The book made numerous claims about steroids and famous athletes who used them during their careers. Canseco, McGwire, and other 11 professional baseball players were subpoenaed to testify at a congressional hearing after the book was published.

Mark McGwire declined to answer the direct questions related to steroids. He made a tearful statement, saying that if a player says NO, he won’t be believed, if he says YES, he risks endless government investigations and public scorn.

According to his lawyers, the only clean option is to refuse to answer.

After years of investigations, on January 11th, 2020, McGwire admitted to using steroids. He said that he used them sporadically for over a decade. He also stated that steroids were mainly used when he sustained injuries, helping him recover quickly.

McGwire regrets using steroids, stating:

“I wish I had never touched steroids. It was foolish and it was a mistake. I truly apologize. I wish I had never played during the steroid era.”

Although Mark McGwire admitted to using steroids, he always said that steroids were only useful to help him recover after injuries.

According to him, steroids were never used to improve performance. Critics say that this is not true, and the only reason McGwire admitted to using steroids was caused by his decision to become a coach at St. Louis Cardinals.

So what’s the verdict? Yes, Marc McGuire used steroids during his professional baseball career. They are a big part of why he became one of the greatest home run hitters of all time.

Marc McGuire Before And After steroids

Marc McGuire doesn’t have any of the usual signs of steroid use, such as massive shoulders or an insanely muscular physique. His physique also doesn’t look very different from the start of his baseball career, to the end.

In both pictures Marc has a lean, athletic build, but nothing out of the ordinary.

Marc’s physique can certainly be attained by a natural athlete. So why did Marc go through all the trouble of using steroids, when he knew he could be caught? The truth is I’m not 100% sure.

Maybe Marc thought the steroids would help him recover faster between games, or after workouts.

It isn’t clear from Marc’s photos that he used steroids, but the fact that he admitted to using steroids is enough proof for me.

Mark McGwire steroids before and after

Legal Steroid Alternatives?

Marc McGuire used anabolic steroids during his professional baseball career to get an unfair advantage over his competition. But that doesn’t mean steroids are a good idea for most people.

Anabolic steroids are extremely dangerous, and can cause long-term damage to your liver, kidneys and many other organs. There’s also no guarantee that steroids will work for you. Just look at Marc McGuire – despite using performance enhancing drugs, he just looks like a regular baseball athlete.

Fortunately, there are many “legal steroid alternatives” that you can use to transform your physique without jeopardizing your health [7].

One of the most powerful legal steroid alternatives on the market today is called ecdysterone.

Ecdysterone is a natural sports supplement that is found in many plants like spinach and quinoa. Many fitness experts have started adding ecdysterone to their supplement “stack” because new research shows that it is incredibly effective at building muscle mass and strength.

Some studies show that ecdysterone is just as effective as many anabolic steroids, such as dianabol, for building lean muscle mass [8]! Don’t worry – ecdysterone is not a steroid. It doesn’t impact your hormone levels, and it has no long-term side effects.

Ecdysterone works by increasing protein synthesis in your muscle cells by up to 20% [9].

If you are interested in getting started with ecdysterone then we strongly recommend the brand Huge Supplements. They manufacture their own ecdysterone right here in the United States under FDA-regulated facilities, so you know you are getting a premium product for your money.

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Testosterone Replacement Therapy vs. Steroids

Testosterone replacement therapy is considered the “gold standard” treatment option for men suffering from low T.

The basic idea is to supplement your body’s natural testosterone production with a prescription testosterone medication, so you can raise your testosterone levels to the high-end of the normal, healthy range.

Research shows that testosterone replacement therapy is extremely safe, and has many health benefits for men suffering from low T. Some of the most common benefits include reduced body fat levels, increased sexual performance, and improved energy levels [10, 11, 12].

If you are interested in testosterone replacement therapy, then we strongly recommend the online provider Fountain TRT.

Unlike traditional in-person clinics, Fountain TRT lets you talk to your doctor from the comfort of your own home. They also ship your testosterone medication directly to your front door, so you never have to worry about vising a men’s health clinic.

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Mark McGwire and steroids | The Verdict

What’s the verdict – does Roger Clemens use steroids?

The truth is, Roger Clemens used anabolic steroids during his professional baseball career to get an unfair advantage over his competition.

Roger doesn’t have the physique of a typical steroid user. His flabby belly and jiggly arms look like they belong on an off-duty cop patrolling your local Dunkin Doughnuts. However, that doesn’t mean he is “natty.”

Roger Clemens tested positive for performance enhancing drugs, and this fact prevented him from being voted into the Baseball Hall of Fame.

Roger Clemens cheated, was caught, and ultimately paid the price. Let this be a lesson to anyone who is considering using anabolic steroids in drug-tested sports.


  1. NIDA. 2018, August 12. Anabolic Steroids DrugFacts. Retrieved from on 2022, March 8
  2. NIDA. 2021, April 12. What is the history of anabolic steroid use?. Retrieved from on 2022, March 8
  3. NIDA. 2021, April 12. What are the side effects of anabolic steroid misuse?. Retrieved from on 2022, March 8 Anabolic Androgenic Steroids and Criminality. (2008). Uppsala Universitet.
  4. The Effects of Supraphysiologic Doses of Testosterone on Muscle Size and Strength in Normal Men. (1996). The New England Journal Of Medicine.
  5. George S. Stergiou, Andromachi S. Zourbaki, Stamatis P. Efstathiou, George P. Stathopoulos, Antonios D. Keramopoulos, Theodore D. Mountokalakis, Effect of estrogen receptor modulator tamoxifen on blood pressure, plasma renin activity, and renal sodium excretion, American Journal of Hypertension, Volume 15, Issue 8, August 2002, Pages 739–742,
  6. Why are Steroids Illegal in the United States? (2022). HG.Org Legal Resources.
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  8. 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
  9. Gorelick-Feldman J, Maclean D, Ilic N, Poulev A, Lila MA, Cheng D, Raskin I. Phytoecdysteroids increase protein synthesis in skeletal muscle cells. J Agric Food Chem. 2008 May 28;56(10):3532-7. doi: 10.1021/jf073059z. Epub 2008 Apr 30. PMID: 18444661.
  10. 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.
  11. 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.
  12. 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. PMID: 34396893.
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