Chris Bumstead Steroids: What We Know About CBum’s Cycle

Chris Bumstead is not natural, and he has never claimed to be. The questions people search about Chris Bumstead steroids have mostly been answered by CBum himself: he has spoken openly about using performance-enhancing drugs, said he runs the “minimum effective dose,” admitted he used trenbolone earlier in his career, and called it the most toxic compound in bodybuilding. What he has not done is publish a full list of compounds or doses, so anything beyond his own statements is speculation.

Bumstead won six straight Classic Physique Olympia titles from 2019 to 2024, then retired at 29. In late 2025 he said competing had done “some damage” to his health. This article sets out what he has confirmed, what remains guesswork, how his autoimmune kidney disease fits into the picture, and where things stand as of October 2026.

Is Chris Bumstead Natural?

No. Chris Bumstead is an enhanced bodybuilder, and he has said so himself in long-form interviews with Chris Williamson and Patrick Bet-David, among others. He competed in the IFBB Pro League, which does not drug test for anabolic steroids, and steroid use at Olympia level is an open secret that most top competitors no longer bother to deny.

What makes CBum unusual is not that he used PEDs. It is that he talked about them, including the risks, while he was still the face of the sport. That openness is why “Chris Bumstead steroids” is such a common search: people want to know what a six-time champion actually takes, and how much of his physique comes from drugs versus genetics and training.

If you want to compare him with athletes who compete or train without drugs, see our list of the best natural bodybuilders and our breakdown of steroids vs natural physiques.

Who Is Chris Bumstead?

Chris Bumstead was born on February 2, 1995, in Ottawa, Canada. He played several sports growing up before he started lifting in high school, and he entered his first bodybuilding show at 19. His early coach was Iain Valliere, an IFBB pro and the partner of Bumstead’s sister. Valliere coached him until 2022, when Hany Rambod took over.

He earned his pro card at 21 by winning the 2016 IFBB North American Championships, moved into Classic Physique, and placed second at his first two Olympias before beginning a six-year winning streak.

Quick Stats

Career Timeline

Six consecutive Olympia titles puts Bumstead alongside the longest streaks in the sport. In the Open division, Lee Haney and Ronnie Coleman each won eight in a row and Phil Heath won seven.

Chris Bumstead Steroids: What He Has Actually Said

There are three public statements that matter most. Each one is reported below with its source. We have not added compounds or doses he did not name.

“Minimum effective dose” (Patrick Bet-David, December 2023)

On Patrick Bet-David’s Valuetainment channel, Bumstead said the people he trusted always told him to use the minimum effective dose: start with the lowest amount and only increase if needed. He said he had not changed his steroid amount in five years and that his usage had come down over the course of his career.

In the same interview he drew a line between TRT and steroid use. He described TRT as a medical treatment that can make sense for men over 35 with low testosterone, and steroid use as higher-dose and more underground. He listed infertility, heart disease risk, worse cholesterol and liver and organ damage as risks, warned that even one cycle can permanently suppress natural testosterone production, and said young people whose physiques are still developing should not use steroids at all.

Trenbolone: used it, then stopped (Chris Williamson, 2023)

In a 2023 interview with Chris Williamson, Bumstead singled out trenbolone. He called it “probably the most toxic thing you can put in your body,” said he had used it in the past, and said he had not touched it in about five years. He also said he had made a deal with himself to walk away if his health started to decline, whether or not he was still winning, and that he relied on regular bloodwork to track his health.

“Some damage” to his health (Chris Williamson, October 2025)

A year after retiring, Bumstead went back on Williamson’s channel and was more direct. “There definitely is some damage that happened to my health,” he said, adding that this made retiring easy because he was no longer willing to make that sacrifice. He also said he had always been “very conscious that bodybuilding is not good for your health“.

He did not, in that coverage, put a name on the damage or tie it to a specific drug. He separated it from his earlier autoimmune problems, which he described as unrelated to bodybuilding.

What Is Speculation About the Chris Bumstead Cycle

Search for “Chris Bumstead cycle” and you will find detailed tables of compounds, sometimes with weekly doses. None of those come from him. Here is how to read that material.

What is reasonably safe to say:

• He used anabolic steroids throughout his competitive career.
• He used trenbolone at some point and says he stopped.
• He says his doses were moderate by Olympia standards and decreased over time.

What is speculation:

• Specific compounds beyond trenbolone. Commentators often guess at a testosterone base, growth hormone and the cutting compounds commonly discussed in Classic Physique prep. Bumstead has not confirmed any of these, and Muscle & Brawn does not treat them as fact.
• Any dose numbers. No dose figure for CBum’s cycle has been verified.
• Claims that his cycle is a “template.” It is not one. He was an elite athlete with a medical team, frequent bloodwork and a known kidney condition. Copying a guessed protocol based on his physique would be a mistake, and we do not recommend it.

Why Classic Physique Changes the Picture

One reason people assume CBum’s PED use was lighter than an Open bodybuilder’s is the division itself. Classic Physique uses height-based weight caps, and judging rewards shape, proportion and a small waist rather than maximum size. A competitor who cannot step on stage above a set weight has less reason to chase extra mass.

That logic is reasonable, but it is still an inference. It fits what Bumstead has said about minimum doses. It does not tell us what he actually took.

For a broader look at how enhanced physiques compare with natural ones over time, see our steroids before and after breakdown.

Chris Bumstead’s Kidney Disease

Bumstead’s health history is a large part of why his comments on PEDs carry weight.

In 2018, a few weeks before the Olympia, he developed severe water retention and was hospitalized. Doctors found an autoimmune kidney condition, widely reported as IgA nephropathy. He still competed and placed second. He has described the condition as something he will live with permanently, with no cure, and has said he had a similar unexplained episode in college.

IgA nephropathy is an autoimmune disease in which antibody deposits build up in the kidney’s filters, causing inflammation that can let blood and protein leak into the urine. It is not caused by steroids. However, heavy training, aggressive dieting, dehydration before shows and some PEDs all put extra stress on the kidneys, which is why his situation drew so much attention.

After winning his fifth title in late 2023, Bumstead traveled to Dubai for a preventive stem cell procedure in which stem cells were injected through the renal artery. The doctor involved described his kidney function as mildly impaired and said he was not close to chronic kidney disease. The procedure is experimental, and its long-term value for kidney disease is not established.

Bumstead has said his autoimmune issues were unrelated to bodybuilding. He has also said bodybuilding damaged his health. Both can be true, and he has not publicly explained how the two overlap.

Retirement and Where CBum Is Now (October 2026)

Bumstead won his sixth Classic Physique Olympia in October 2024 and announced on stage that he was retiring, pointing to his family and the toll of competing. A few weeks later he made a one-off appearance in the Men’s Open at the EVLS Prague Pro and finished second to Martin Fitzwater after a short prep. He then confirmed he was done.

Since then:

• No comeback announced. In June 2026, Olympia head judge Steve Weinberger said on Instagram that CBum could make the Men’s Open top five with more size and a year of hard training. That was a judge’s opinion. Bumstead did not compete at the 2026 Olympia and has not announced plans to return.
• Physique speculation. Off-season photos in 2026 started rumors about a big Open comeback. None have been confirmed by him or his team.
• Family. His second daughter was born in January 2026. He has named family priorities as a main reason for staying retired.
• Documentary. A trailer for a documentary built around his final title was shown during Olympia weekend in September 2026. No release date or platform has been confirmed.
• Business. He became a part-owner of Gymshark in September 2024 and continues to run his own brand and YouTube channel.

His retirement also gives the PED discussion a clear ending point. He said in 2023 he would quit if his health declined, retired at 29, and a year later said competing had cost him something. Few champions have been that consistent about it in public.

How CBum Compares With Other Physique Stars

Bumstead sits at one end of a spectrum. Some famous physiques belong to openly enhanced athletes. Others belong to people who say they are natural, sometimes against heavy skepticism.

• David Laid has long faced natty-or-not questions from fans.
• Ryan Terry, a Men’s Physique Olympia champion, competes in the same untested federation as CBum.

The difference with Bumstead is that there is no mystery to solve on the basic question. He answered it himself. The open questions are about details he has chosen to keep private.