L-Arginine found in SilverOnyx Nitric Oxide supplements is an amino acid which can be converted to nitric oxide.</br></br> Our nitric oxide support supplement also contains citrulline malate.</br></br>Supplement Facts (per 2 Veggie Capsules):</br> Niacin - 30mg</br> Calcium (as Calcium Carbonate) - 30 mg</br>L-Arginine - 400mg</br>L-Arginine AKG 2:1 Extract - 400mg</br>L-Citrulline - 200mg</br>L-Citrulline Malate Extract - 200mg</br>Beta Alanine - 80mg</br></br>Inactive Ingredients: Cellulose (Vegetable Capsule), Magnesium Stearate (Vegetable), Silicon Dioxide.</br></br> Each batch of our SilverOnyx Nitric Oxide Arginine Supplement is proudly manufactured and bottled in the USA facility following strict cGMP guidelines. Third party tested for purity and quality by an experienced dietary supplement laboratory