This column was featured in Issue 26. Subscribe today to get Issue 27, arriving early next month, and an issue every two months thereafter, delivered straight to your home or workplace. ‘You just piss it oot,’ my friend Stuart Ritchie has always told me. In a politer register, other friends have expressed scepticism too. But for a long time, despite the wisdom of my smartest scientist pals, I was an enthusiastic believer in supplementation.