L-Citrulline is an amino acid. It is turned into L-arginine in the kidneys after supplementation, which means L-citrulline supplementation is a more effective method of increasing L-arginine levels in the body than L-arginine supplementation.
Fatigue
The decrease in fatigue during exercise is thought to underlie most of the benefit seen with training capacity (work volume), although in men who self-report fatigue issues supplemental citrulline appears to help with that as well (independent of exercise)
https://www.ncbi.nlm.nih.gov/pubmed/20386132
https://www.ncbi.nlm.nih.gov/pubmed/12145119
Muscle Soreness
The lone study using citrulline acutely pre-workout noted a 40% reduction in muscle soreness the following two days after the workout.
https://www.ncbi.nlm.nih.gov/pubmed/20386132
Muscle Oxygenation
An increase in muscle ATP production via aerobic means was noted in men given 6g citrulline daily, but this appeared to be attenuated with time.
https://www.ncbi.nlm.nih.gov/pubmed/12145119
Reference: https://examine.com/supplements/citrulline/
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