The UCI is set to approve the use of ketone supplements in the peloton, after a multi-year study into the product has concluded that they are safe and do not offer a significant performance enhancement to users.

Ketones are naturally produced by the liver when the body burns fat instead of glucose for energy, and synthetic ketones have been on the market for almost two decades.

They are said to aid recovery, but the jury has been out on whether or not they enhance performance levels, with multiple studies in recent years producing contrasting results.

This article was published by Cycling Weekly during the 2025 Tour de France. You can read the full article here.