To produce serotonin, the body needs to convert it from tryptophan, an essential amino acid, that must be obtained through our diet.
Its better to obtain these through diet, because SSRI drugs, can have serious side effects, and don’t work for everyone. Up to 40% of those who try them, do not get results.
Tryptophan supplements, can also have unpleasant side effects.
Additionally, since high density protein (meat), blocks serotonin synthesis, eating meat will actually cause both tryptophan and serotonin levels to drop, which can cause depression.
Omega-3, omega-6, and gamma-linolenic acid (GLA) are required for serotonin production. GLA is found in particularly high amounts, in black currant seed, and hemp seed oil.
A List of Seratonin-boosting Foods
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Almonds and almond oilWalnuts and walnut oil
Brazil nuts and brazil nut oil
Hazelnuts and hazelnut oil
The Cacao bean is one of the most plentiful sources of plant-based tryptophan. Cacao Essential Oil, stimulates both serotonin and dopamine production. You can absorb this through the skin, via products that contain cacao essential oil. 
Frankincense essential oil is a wonderful ally for all forms of anxiety, and helps the body make and utilize serotonin and dopamine. You absorb essential oils through the skin, where they enter the bloodstream.
Green tea and green tea oil – Contain polyphenols, good for brain and heart function, as well as dopamine production.Hemp seed oil and dandelion oil boost serotonin production.
The above foods should be eaten organic, and the oils must be organic and cold pressed, in order to have the serotonin boost required. The oils should be used unheated, over your favorite recipes, as heating destroys the dopamine and serotonin boosting properties.