What substances did Jana Fett test positive for?
Ostarine, LGD-4033, and GW501516.
Sports / Tennis
Croatian tennis player Jana Fett has been provisionally suspended from the sport after testing positive for three prohibited substances. The International Tennis Integrity Agency (ITIA) confirmed the suspension, which stems from a sample co...
Jana Fett, a 29-year-old Croatian tennis player, faces a provisional suspension following a positive test for three banned substances. The ITIA reported that the sample was collected during the Billie Jean King Cup playoffs in November 2025. The substances found in Fett’s sample include ostarine (an anabolic steroid), LGD-4033 (an experimental drug for muscle atrophy), and GW501516 (a substance banned for human consumption due to links to rapid cancer development in mice).
Fett, who reached a career-high ranking of No. 97 in 2017, denies intentional use and is working with advisers to prove her innocence. The Croatian Tennis Federation supports Fett, suggesting unintentional ingestion. While Fett has the option to appeal the suspension, she has not yet done so. This case adds to a list of doping incidents in tennis, highlighting the ongoing challenges in maintaining the integrity of the sport. Other players, such as Jannik Sinner and Iga Świątek, have faced similar situations in recent years, underscoring the importance of strict anti-doping measures.
Ostarine, LGD-4033, and GW501516.
Fett claims she has never knowingly or intentionally taken any prohibited substances and is working to prove her innocence.
No, Fett has chosen not to appeal the provisional suspension.
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