L-Histidine?? provided by Douglas Laboratories?? supplies 500 mg of the amino acid in each capsule.</br>DOES NOT CONTAIN: This product contains NO yeast?? wheat?? gluten?? soy protein?? milk/dairy?? corn?? sodium?? sugar?? starch?? artificial coloring?? preservatives or flavoring.</br>As a dietary supplement?? adults take 1 capsule daily or as directed by physician.</br>* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose?? treat?? cure?? or prevent any disease.</br></br>Product Description</br></br>L-Histidine?? provided by Douglas Laboratories?? supplies 500 mg of the amino acid in each capsule.</br><br/>http://www.amazon.com/gp/product/B000UV5A2C