Questions raised over use of ketone 'miracle drink' at Tour de France

Jumbo-Visma, who have so far won four stages in this year's race, confirmed they had been using the dietary supplement

Jumbo-Visma during the team time trial on stage two of the Tour de France 2019 (Photo by Jorge Luis Alvarez Pupo/Getty Images)

(Image credit: Getty Images)

Jumbo-Visma's team boss Richard Plugge has confirmed his squad have been using ketones, a "miracle drink" dietary supplement that aids recovery for endurance athletes, during the Tour de France 2019, where the Dutch team have so far won four stages.

Plugge noted that the substance, which are used just like other vitamins, is not on the prohibited list and is also being used by other teams, with seven of the 22 squads at the 2018 reported to have benefitted from its use.

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