The essential amino acid L-tryptophan serves as a critical precursor to serotonin and melatonin, supporting mood regulation, relaxation, and healthy sleep patterns. Each 500mg capsule is formulated for optimal absorption, with a recommended dosage of one capsule three times daily between meals, preferably with fruit juice. For enhanced sleep support, an additional three capsules before bedtime is recommended. This premium supplement contains no yeast, dairy, egg, gluten, soy, wheat, preservatives, or artificial additives. Manufactured in Scotts Valley, California, Source Naturals has maintained unwavering quality standards for over 35 years.