As well as using extreme lengths to bulk up to a combined weight of 241kg, the brothers from Rio, Brazil, attend the same gym everyday and work out together for hours to improve their definition.

Tony, 49, and Alvaro, 50, claim there was a time when they were ‘addicted to getting big’ but now believe they have it under control.

Alvaro had been injecting his biceps and legs with a supplement - called Potenay B12 - on and off since he was 15 years old.

And Tony followed in his older brother’s footsteps just a few years later after seeing how big he was getting.

The giant Brazilians both felt like they were 'too skinny’ when growing up - Tony weighed 49kg and Alvaro weighed 70kg – and so they turned to the chemical substance to help them out.

Alvaro told Barcroft TV: "Back then we were [addicted]. Today, no. We have it under control.

“People around me didn’t let me go on the wrong path and I did the same with my brother.

“He always wants to be bigger, but I always tell him that we need to be careful.

“Now, I am known as The Hulk, The Giant, The Great Wall, The Wardrobe and Big Arms.”

The brothers would take the chemical supplement in cycles - injecting two times a week and then resting for five days - whilst working out in-between.

Now, each of Tony's bulging biceps are 28 inches round and Alvaro’s are 25 inches.

Unsurprisingly, their main inspirations to bulk up were the Incredible Hulk and Arnold Schwarzenegger, when he starred as Conan The Barbarian.

Taking their doctors advice, the brothers claim to have recently stopped injecting for health reasons and because their skin cannot stretch anymore.

Potenay B12 is a mephentermine-based multi-vitamin stimulant that should only be used for veterinary purposes, on weakened animals such as horses.

But Brazil has seen an increase in people injecting the supplement to get a literal ‘animal’ disposition and enhance their muscles in a short space of time.

Their family has always been particularly worried about Tony using Potenay B12, as he has high blood pressure.

Alvaro said: “We got to the point where we couldn’t get any bigger. But then we found out about Potenay B12.

“The supplement makes you gain the mass you would have gained in a year, in a month.

“If you do it in the wrong way, you can die. It happens a lot.

“We know people who have died.”

Alvaro’s wife, who he met at the gym, and seven children support him in getting as big as possible.

Tony has been married for 27 years and has three daughters. His wife doesn’t agree with him taking such unnatural substances or the way he looks, but he says she has to accept it or they’ll break up.

The brothers claim they get a lot of attention from other women and Tony often says to his wife that if she doesn’t find him attractive, he doesn’t care, because other women do!

Tony said: “My wife doesn’t like it. However, I am happy with myself.

“I was very skinny when I was young. I wanted to be muscular and big.

“She has to accept me like I am, or we will have to go on separate ways.

"I usually tell my wife that she’s the only one who doesn’t like me. Other women love my size, they love it.

"Once we were walking in front of my gym and I told her, “look, if you don’t want me there are several other girls who do”. Then, I pointed to all the girls coming to talk to me."

Tony eats every three hours, usually eggs, sweet potatoes and meat – racking up about 6000 calories a day.

Alvaro eats four times a day and they’ll often consume 12 bananas and six egg whites each before a work out.

Tony, who works as a prison guard, admits that he never has any problems with the inmates as soon as they see his size.

Although, sometimes, his size does cause him moments of unnecessary bother in everyday life.

Tony said: “Sometimes my size is a problem. My biceps and triceps are 72cm and my forearm is 47cm.

“I think I can pass through a place and I won’t fit through it.

“All these scars here [pointing to arm], are from trying to fit through a place I think I can fit.

“There was one point I grew too much and it was impossible to use the supplement. You’ve got to know when to stop.”

However, not every part of the body increases in size when injecting such a substance.

When asked if one’s penis size decreases as a result of injecting Potenay B12, Tony said: “It is true. If you over use it, you will develop muscular atrophy of the testicles and penis.”

Alvaro added: “But so far, nobody has complained.

“If they complain, I will be upset!”

Even now, Tony and Alvaro are still keen to improve their size and they are more than aware that their lifestyle will not please everyone.

Alvaro said: “Everyone will criticise you.

“I wouldn’t recommend this method to anyone. Each person has a set mind and young people want results overnight.

“Then they use it incorrectly and they get extremely ugly and deformed. Deformed is so ugly.

“Some like it, because they are into it. Others think it’s horrible.

“But you need to get used to that.”