Citrulline malate increased strength endurance in chin-ups, reverse chin-ups and push-ups in college-aged men— according to a study led by Benjamin Wax from Mississippi State University. Citrulline is an amino acid that is converted to arginine, which increases levels of nitric oxide— an important chemical that regulates blood flow throughout the body. Citrulline also increases brown fat activity, which increases caloric expenditure and promotes fat burning. It does this without stimulating the sympathetic nervous system, which avoids increases in heart rate, blood pressure and anxiety levels. Citrulline malate might be an effective supplement.
Source: Journal of Dietary Supplements, published online February 12, 2015