The participants were divided into 5 groups:

Citrulline: 6 grams per day
Sodium bicarbonate: 0.3 grams per kilogram of body weight per day
Citrulline plus sodium bicarbonate
A placebo
No supplement (the control)

All of the participants performed a sprint workout 3 times per week for 4 weeks. At baseline and after 4 weeks, the participants completed 4 tests for power output (e.g., a 20-meter sprint test and vertical jump test) and 1 test for VO₂max.

After 4 weeks, all of the power output test results improved in the supplement groups, but not in the placebo and control groups. There were no significant differences among the 3 supplement groups.

Citrulline and sodium bicarbonate can power up basketball players Original paper