Information Reviews Ask Dr. Dan Product Description Priority One 5-Hydroxy-Tryptophan supports anxiousness, depression, seasonal affective disorder, low mood, and hyperactivity. Recommended use: Take 1 capsule or as directed by a healthcare professional. Label Information Priority One 5-Hydroxy-Tryptophan Facts: 1 vegetarian capsule contains: Griffonia simplicifolia (seed) (98% L-5-Hydroxytryptophan) 100 mg Other Ingredients: Rice chelate, vegetarian capsule (hypromellose, purified water).