Liverpool have been working with Mark Warnecke, who has created two mineral drinks, one orange and one citron, to 'significantly speed up regeneration after exercise'.
Warnecke became the oldest person to win a swimming world title since 1971, when he did so at the age of 35 in 2005.
He has been working alongside Liverpool nutritionist Mona Nemmer, who has previously worked with Bayern Munich. Warnecke describes Nemmer as "the best nutritionist ever."
Warnecke's drinks helped American swimmer Dara Torres, a 12-time Olympic medallist, to come out of retirement at the age of 41, after having a child, and record her best times in 20 years.