I have been working with Noni for over 20 years, of the many benefits of noni, better mood, and mood regulation has been at the top. Anecdotally we even know this. The ancient Polynesians prescribed noni for happiness, including those with relationship issues. Marital problems? Drink Noni!
Among many other compounds, noni has a statistically significant amount of serotonin. This compound is what we believed is responsible for mood improvement.
Recent science is shedding more light on this. The article linked below by psychology today "Anti-Inflammatories Help Major Depression" details another very likely reason Noni helps mood regulation and improvement.
As you may know, the number one testimonial for Noni is pain and inflammation. More reason to keep drinking your noni!!!