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Nitric Oxide BoosterCardiovascular HealthSpecialtyDietary Supplement Quality Promise Tested & Trusted Gluten-FreeDairy-FreeSoy-FreeNut-FreeWhether you're a weight-lifter runner or all-around fitness enthusiast it's important to keep up with your cardiovascular health. Here's where l-citrulline can help. L-citrulline is a free-form amino acid that the body converts into nitric oxide which plays a critical role in circulation. With good circulation comes more reps laps and achievements!The Vitamin Shoppe® brand L-Citrulline capsules features 1 000mg of l-citrulline per serving to support your cardiovascular system promote nitric oxide production and exercise endurance.