Testosterone replacement therapy comes with serious and potentially irreversible health risks including infertility and early heart disease

• Read more in the Antiviral series

Are you tired? Feeling flat and irritable? Finding it difficult to concentrate? Maybe you’re experiencing the seemingly ubiquitous symptoms of modern life. Or, if you’re a man, you may have been told by countless uncredentialed online influencers that you’re probably suffering from “low T”.

For decades, testosterone has been marketed to men as a means to maximise virility. But in recent years, social media has fuelled the “T-maxxing” trend, in which men are encouraged to maximise their testosterone levels through either natural or artificial means.