Good Health High 5HTP 100mg provides a high dose of plant derived 5-HTP per capsule. 5-HTP is a precursor to serotonin, which is one of our ‘feel good’ brain chemicals. Low levels are linked with low moods, stress, anxiety and carbohydrate cravings. 5HTP is also converted into melatonin – an important brain hormone also involved in sleep and mood regulation. In the nervous system, serotonin has an important role in balancing stress levels and appetite, and supporting mental wellbeing and healthy sleep.