Shayna Jack has revealed the banned substance found in her system, and has vowed to clear her name and find out how she came into contact with the drug.

Key points: Shayna Jack reveals the banned substance behind her suspension is Ligandrol — a drug used to aid muscle growth and treat osteoporosis

Shayna Jack reveals the banned substance behind her suspension is Ligandrol — a drug used to aid muscle growth and treat osteoporosis She insists she would never have knowingly taken a prohibited drug and jeopardise her career, given she is tested so frequently

She insists she would never have knowingly taken a prohibited drug and jeopardise her career, given she is tested so frequently Jack said she did not want to take away from her fellow athletes' moment when she first found out about the positive test

Jack, 20, shocked the Australian swimming fraternity with the news she had tested positive for a banned substance — now revealed to be Ligandrol — which forced her withdrawal from the national squad prior to the world championships in Gwangju, South Korea.

Ligandrol is a selective androgen receptor modulator (SARM), which was developed to help with the treatment of medical conditions like osteoporosis. It aids the growth of muscle mass and has been detected in drug tests used in sport.

In a statement linked from her Instagram account, Jack relayed the shock and confusion she experienced when called in by ASADA and was told she had tested positive.

Jack intimated that Ligandrol can be found in contaminated supplements.

"I was in complete shock, asking myself how and why is this happening to me. My brain repeated over and over: 'I have always checked my substances', 'I didn't do this', 'why is this happening to me?', 'I've done nothing wrong'," she said.

"I could still hear the woman in the background on the phone, talking more about what will go on and that I have to leave the camp and return home, as I was placed on immediate provisional suspension until the B sample is tested.

"She also went on to explain what was found in my system, I had never heard of it before, let alone know how to pronounce it; she said it was 'Ligandrol'. I now know that this can be found in contaminated supplements."

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 1 minute 30 seconds 1 m 30 s Swimming officials defend delayed release of drug test result

In a 2018 blog post, ASADA warned athletes that not only was LGD-4033 (Ligandrol) prohibited in sport, but it was not yet cleared through clinical trials.

"It is claimed to be a substance that induces muscle (and bone) growth without the side effects associated with steroid use. However, information on the safety of LGD-4033 is scarce due to a lack of medium and long-term clinical trials — hence the medium and long-term health impacts are unknown," the blog post read. "It should be noted that a number of SARMs have associated health-risks, particularly for the heart and liver. "The Australian Therapeutic Goods Administration (TGA) classifies LGD-4033, like all SARMs, as a Schedule 4 drug — a prescription-only medicine or animal remedy. The possession of LGD-4033 without appropriate authority is illegal."

Coach believes her story

Jack's coach said he believes her claims that she doesn't know how banned substances entered her body.

"I believe she's going through a hard time and I fully support Shayna but I do fully support the process," Dean Boxall told the ABC on Sunday night.

"As soon as we found out about the positive test she left, she wasn't here, we've gone through the process and we've just got to let it unfold.

"It's in the lawyers hands but she's being taken care of."

Asked if he was confident she would be cleared by ASADA, he replied: "Ah you can't be fully confident, can you. I mean it's in front of the lawyers and I fully trust and believe in Shayna."

Jack didn't want to distract fellow athletes

Jack said she wanted to open up to her teammates and discuss with them what happened when she was first told of her suspension, but said she wanted them to focus on themselves and their events.

"After many hours of crying and feeling so helpless, I managed to pack my bags and went for an 8km walk with my coach, Dean Boxall, while the team was informed of my departure, without any indication of what for," Jack said.

"I wanted to open up to them and discuss with them what had happened. I felt so vulnerable. But I knew that they had to focus on themselves and continue to represent Australia without me on the team.

"I respect my teammates and my sport too much to take away their moment, so I returned home and said nothing."

Shayna Jack says she is determined to prove her innocence. ( AAP: Matt Roberts )

She said she had hoped her B sample would prove her innocence, but instead was confronted by a career-changing result.

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

"As I read the results, my brain couldn't even comprehend what I was seeing. I had to reread it several times before I felt that same pain and heartache all over again.

"I instantly turned to my grandma, who was with me at the time, and wailed. With my legs no longer holding me up, I fell to the ground."

'I did not and would not cheat'

Jack said she never missed a drug test and would not jeopardise her career by knowingly taking a banned substance when she was so frequently tested.

"I trained hard to be [at the World Championships] racing and to support the team, but I understood the rules of ASADA, and I have followed all their processes," she said.

Space to play or pause, M to mute, left and right arrows to seek, up and down arrows for volume. Watch Duration: 30 seconds 30 s Richard Ings says the result should have been announced with greater transparency to the public.

"Deep down, I feel I shouldn't have to defend my reputation as I know that I didn't do this. I have never missed a random drug test, and I always have my whereabouts up to date.

"In Australia, in a sport like swimming, I feel there is no possible way for an athlete to intentionally take a banned substance and not get caught.

"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.

"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."

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