<http://schema.org/alternativeHeadline>
"To boost serotonin levels, you'll want to pay attention to diet, exercise, sleep and stress levels. Our expert has a few tips to help you get a natural lift."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.mnn.com/health/fitness-well-being/stories/how-to-increase-serotonin>