Mr Kim is believed to take his own personal toilet with him everywhere in his armoured vehicles. He is said not to trust public toilets in case his stools fall into the wrong hands.
Sources close to the ruler’s dynasty have said it would be “unthinkable” for Mr Kim to use a regular public bathroom.
The sources added that his faeces must be overseen as they “contain information about his health status”.
His personal facilities are supervised by his bodyguards, and anyone caught using them could be sentenced to death, it is claimed.
It is believed one of the cars in Mr Kim’s convoy in Singapore – where he met US President Donald Trump for an important meeting in June 2018 – featured a private loo.
He also has his own facilities on his heavily-armoured train, which takes him around North Korea and international destinations such as China, Russia and Hanoi, where he had a show-down with Mr Trump in February 2019.
When Mr Kim travelled to Singapore for the 2018 meeting, one of three aircrafts carrying the North Korean delegation contained an armoured Mercedes and a portable Mercedes “that will deny determined sewer divers insights into the supreme leader’s stools”, South Korea’s Chosun Ilbo newspaper reported.
Earlier this year, different reports claimed Mr Kim was dead or very ill as he had not been seen in weeks, but the North Korean ruler later re-appeared during a tour of a fertiliser plant.
Intelligence agencies have previously attempted to get a hold of stools of different leaders to examine the state of their health.
Another source said: “He has to travel around the entire country for field guidance, so there always needs to be a personal restroom exclusively for the Suryeong (supreme leader) Kim Jong-un.
“It is unthinkable in a Suryeong-based society for him to have to use a public restroom just because he travels around the country.”
One of the sources claimed the ruler has private loos so his stools can be examined regularly for medical purposes.
Ahead of the leader’s visit to South Korea in April 2018, Lee Yun-keol, who served in North Korea’s guard command before defecting to the South in 2005, told the Washington Post: “The leader’s excretions contain information about his health status so they can’t be left behind.”
It comes as a confidential United Nations report has revealed that various nations believe North Korea has “probably developed miniaturised nuclear devices to fit into the warheads of its ballistic missiles”.
The report was sent to the 15-member UN Security Council North Korea sanctions committee on Monday.
It reads: “The Democratic People’s Republic of Korea is continuing its nuclear program, including the production of highly enriched uranium and construction of an experimental light water reactor.
“A Member State assessed that the Democratic People’s Republic of Korea is continuing production of nuclear weapons.”
Mr Kim said last week there would be no more conflict as the country’s nuclear weapons ensure its safety despite continuous outside tension and military intimidation.
The UN document said one country, which was not named, believed that North Korea “may seek to further develop miniaturisation in order to allow incorporation of technological improvements such as penetration aid packages or, potentially, to develop multiple warhead systems.”