Bodybuilder buys breast milk online and drinks two sachets a day to 'help build his muscles'

are known for pushing their bodies to the limit with substances - but some are even turning to breast milk in the hopes of piling on the muscle. While scientists agree that breast milk helps build the bodies of babies, they say there is no scientific evidence to support it can do the same for adult men. But that hasn't stopped some from experimenting with it.

Father-of-three Jameson Ritenour, 39, had his first adult taste of breast milk when his partner Melissa was their child. He had become interested in its potential after watching a talking about its effects on . Now every day, Jameson drinks two sachets of his partner's breast milk, and he claims his "body is in the best shape I've been in my life".

"The water in the bottle helped me build my muscles. I lost weight, while increasing my muscle size by five percent in eight weeks."

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He also claims that the milk has had a positive effect on his immunity, and that he can't remember the last time he was sick since introducing it into his diet.

"I want to grow up and sleep like a baby, so I decided that I would also eat like a baby," he said. "I am healthy and in good shape."

Despite Jameson's claims, most scientists say there is no evidence to suggest drinking breast milk could be beneficial for adult men. However, some experts say there is data to support Jameson's experience.

"Water has a lot of beneficial nutrients - the baby is gaining muscle mass, and that's what athletes need," says Lars Bode, director of the Breast Water Research Center at the University of California, San Diego in the United States.

"Exercisers take care of their bodies, so there are things they like. We don't know how that works scientifically."

But the doctor warned people to be wary of purchasing breast milk through sites like , Craigslist and , as some diseases like HIV and hepatitis can be transferred through the liquid.

There appears to be a booming market for the product online.

But a 2015 study showed that 75 per cent of 101 breast milk products sold on the internet contained contaminants, while 19 per cent had been mixed with cow's milk.

Jameson split up with his partner so lost his usual "supply". He turned to buying it online, but says he wasn't concerned about the threat it posed.

"I bought the milk from a place I didn't know about online, but I did some research on Facebook and found out it was safe," Jameson told the . "So I decided to take my chance."

Jameson said that the main issue he has to contend with is judgment from other people. "People gave me a strange look, because babies are more likely to drink breast milk. But it's not as bad as people think," he said.