Swimmer Shayna Jack Vows To Clear Her Name, Reveals Positive Substance

Australian swimming star Shayna Jack has vowed to clear her name after revealing her B sample has tested positive to the drug Ligandrol.

It was believed Jack had been waiting on B sample results after failing a drug test and being sent home from the world titles team bound for South Korea.

But the 20-year-old posted on social media on Sunday that it had come back positive on July 19 -- two days before the world swimming titles started.

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It had tested positive for Ligandrol, a drug popular with bodybuilders and used for repairing worn-out muscles and increasing muscle mass.

"On Friday the 19th of July my 'B sample' results were in," she posted.

"I had felt a sense of hope knowing I didn't take this substance and that it was all a mistake during the testing and that I could return to compete for my country and with the team, however, that wasn't the case.

"As I read the results, my brain couldn't even comprehend what I was seeing."

Jack said she had never heard of Ligandrol let alone pronounce it but believed it was found in "contaminated supplements".

She protested her innocence and vowed to clear her name as she faced an ASADA ban that will almost certainly sideline her for the 2020 Olympics in Tokyo.

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"Deep down, I feel I shouldn't have to defend my reputation as I know that I didn't do this," she said.

Shayna Jack has vowed to clear her name after testing positive to a banned substance. (Image: AAP)

"I get tested approximately every four to six weeks so why would I take anything banned and do this to myself?

"Especially leading up to competition where I could be tested daily.

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"Why would I put myself through this anguish and risk jeopardising my career and my character?

"I did not and would not cheat and will continue to fight to clear my name."