At the Tokyo Olympics, the British sprinter tested positive for two banned substances after taking a £10 supplement from Amazon.
Ujah was handed a backdated 22-month ban, but was cleared of taking banned drugs.
The men's 4x 100m silver medal was taken away from Britain after he tested positive for two banned substances at the Olympics.
Speaking to the Guardian, 28-year-old Ujah said he had become "complacent" during the Covid-19 lockdowns.
He said that he used the people and resources around him more on Amazon. Next-day delivery made it convenient. I didn't think it was a problem.
Ujah said he had been taking the supplement for a few weeks before the Olympics, but didn't know they were contaminated with the two banned substances. He said his last drugs test was in May 2021.
The UK Anti-Doping website states that S-23 is a drug designed to have similar effects to testosterone and that it is legal under WADA rules.
I know what you mean. He said he would have liked to have been tested before the Olympics.
I wouldn't have put my team-mates through what I went through.
Zharnel Hughes, Richard Kilty, and Nethaneel Mitchell-Blake were stripped of a medal after being part of the 4x 100m relay team that was disqualified.
If he is selected to compete in the World Championships in Hungary, his ban will end on June 5, 2023.
The actions of Ujah were expressed by the UKA.
As he tries to prove himself more than ever, the athlete has stopped taking supplements.
He did not take anything. I will be looking to get everything from natural foods in the future. I'm afraid. At one point, I was afraid to take the drug.
You become scared of putting something in your body.