A study looked at the effects of betalain-rich beetroot concentrate on 28 trained male cyclists. The cyclists received 100 mg of either beetroot concentrate or placebo every day for a week. The group that received the beetroot concentrate had improved exercise efficiency and increased blood flow.
Reference:
Mumford, P.W., et al. (2018). Effect of 1-week betalain-rich beetroot concentrate supplementation on cycling performance and select physiological parameters. European Journal of Applied Physiology, vol. 118, iss. 11, 2465–2476.
