Science-Based Nutrition Helps Promote Healthy Sleep Dietary Supplement Non-GMO - Gluten Free - Soy Free - Vegan Doctor's Best 5-HTP (5-hydroxy L-tryptophan contains a naturally occurring metabolite of the amino acid tryptophan. 5-HTP is extracted from the seeds of the Griffonia simplicifolia plant. 5-HTP is converted in the brain to serotonin, a neuro-transmitter substance found at the junction (synapses) between neurons. It produces a calming and relaxing effect providing support to help maintain mental, emotional well-being, and to promote healthy sleep. Doctor's Best 5-HTP is tested to ensure that is does not contains "Peak X". Helps promote healthy sleep Helps promote calm and relaxation Helps support metnal and emotional well-being