Helps support relaxation?? restful sleep?? and positive mood</br>Also supports immune functions</br>L-Tryptophan is extremely pure and is regularly tested to ensure the highest standards of quality</br>Converts to niacin?? which supports circulation?? a healthy nervous system?? the metabolism of food?? and the production of hydrochloric acid for the digestive system</br>Contains vitamin B-6?? which is required to convert tryptophan to serotonin</br></br>Product Description</br></br>Helps support relaxation?? restful sleep?? and positive mood;Also supports immune functions; L-Tryptophan is extremely pure and is regularly tested to ensure the highest standards of quality;Converts to niacin?? which supports circulation?? a healthy nervous system?? the metabolism of food?? and the production of hydrochloric acid for the digestive system;Contains vitamin B-6?? which is required to convert tryptophan to serotonin</br><br/>http://www.amazon.com/gp/product/B0016HF3QW