★★★★★
Milk Kefir abundant in Serotonin. Noni Juice contains Serotonin. Brown Rice contains Tryptophan which is a precursor to Serotonin. Red Miso is rich in Tryptophan, which is readily available in absorbable format.
Wheat Grass Juice contains nice amino acid profile providing serotonin.
Warning: Soy Milk is a Goitrogen and Tryptophan Inhibitor.