Clean Boxing Program: Cyclofenil

In the demanding world of professional boxing, where every advantage can make the crucial difference between victory and defeat, the WBC has intensified its fight against doping.

One substance that has gained attention in recent years is cyclofenil, which is prohibited by the Clean Boxing Program (CBP), administered by the Voluntary Anti-Doping Association (VADA).
Cyclofenil is a selective estrogen receptor modulator (SERM) originally developed to treat hormonal disorders. However, it has been used non-medically in sports.

Although its name isn’t among the most publicized compounds, experts point out that cyclofenil represents an unfair competitive advantage and a potential health risk. Clinical studies have documented its hepatotoxic effect, with cases of drug-induced hepatitis, making it a doubly dangerous agent: for the opponent and for the boxer who consumes it.

The WBC Clean Boxing Program, created in 2015 in partnership with VADA, requires all champions and fighters ranked within the top 15 to undergo random in-competition and out-of-competition testing.
If you want to view the list of prohibited substances issued by VADA, you can consult the following link: https://wbcboxing.com/wp-content/uploads/2025/VADA-Prohibited-List-2025.pdf