The cannabis-derived compound is popping up in everything from mineral water to bath bombs. We ask experts and users if it actually works

Aaron Horn first came across cannabidiol, or CBD, about three years ago in Glastonbury – the town, not the festival. “I found it at this amazing hemp shop, Hemp in Avalon,” recalls Horn, a musician who is now 35. “It’s run by a guy called Free. His last name is Cannabis. He changed his name by deed poll to Free Cannabis.” Horn bought a tube of high-concentration CBD paste – “it comes out like a brown toothpaste, almost” – and it was recommended he put a tiny dot on his finger and pop it in his mouth.

Horn’s adult life had been spent in the shadow of a horrific accident that took place when he was 22. In June 2006, he had been shooting at a target with an air rifle in the garden of his family home; his parents are the music producers Jill Sinclair and Trevor Horn. Horn didn’t realise his mother was nearby, and a stray pellet lodged in her neck and severed an artery. Sinclair experienced hypoxia, which caused irreversible brain damage, and she spent years in a coma before dying in 2014. Read more