Do cyclists use whey protein?

This question is about and NutritionCycling
Natalie Rizzo, MS, RD, Freelance Writer
Yes, many cyclists use whey protein. Whey protein is a byproduct of milk and the main component in many protein powders. 
Many athletes supplement their diets with whey protein after a ride to help with muscle recovery and repair. Whey protein is rich in leucine, an amino acid shown to stimulate muscle protein synthesis [1]. (You can read more about leucine here.).
Whey protein in a clear scoop on a wooden background
[1] Kerksick, C.M., Wilborn, C.D., Roberts, M.D. et al. ISSN exercise & sports nutrition review update: research & recommendations. J Int Soc Sports Nutr 15, 38 (2018).