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Beefcake Valdir Segato's huge biceps measure a staggering 23 inches as a result of painful synthol injections.

The 48-year-old's arms have doubled in size from 12 inches after he began injecting the potentially lethal oil substance five years ago and now he wants to get even bigger.

Segato, from Sao Paulo, Brazil, is inspired by the physiques of Arnold Schwarzenegger and fictional characters like The Hulk and is proud to be known locally as 'the monster' in the street.