L-Citrulline Improves Performance

Citrulline is an important amino acid involved in the formation of urea. It is a popular component in athletic food supplements because it participates in key amino acid reactions and influences blood flow by increasing nitric oxide levels. Nitric oxide is an important chemical secreted by the endothelium— the inner lining of the blood vessels. Stephen Bailey and colleagues from Exeter University in the United Kingdom found that citrulline supplements (six grams per day) improved resting blood pressure, accelerated oxygen uptake during exercise, improved endurance performance and enhanced tolerance to high-intensity exercise in healthy adults. Watermelon rind is an excellent source of citrulline. (Journal Applied Physiology, published online May 28, 2015)

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