“I don’t think supplements are the answer to fix my problems,” she says, stressing the importance of “eating a balanced diet, training well, sleeping right, recovering well, hydrating – all of those things” before adding supplements.

“There are various reports in the literature of some studies that say maybe up to 90% of athletes take supplements. I often jokingly say that means 10% are lying,” says Prof. Graeme Close, professor of human physiology at Liverpool John Moores University.

“The sports teams that I’ve worked in, I think that’s probably closer to 100% of athletes will be taking some form of supplementation.”

So, what do supplements actually do, and why do athletes take them? In the world of strict liability, where elite athletes are solely responsible for what they put in their bodies, how do they make sure they stay clean?

The message from sports nutrition experts is therefore straightforward: supplements may offer the extra one per cent, but elite performance is built on getting the other 99 per cent right.