If morning light can act as an antidepressant, can evening darkness work as an antimanic? 

Cytisinicline—historically known as cytisine—is a naturally occurring plant-based alkaloid that has been used for smoking cessation in Central and Eastern Europe since World War II. 

Curcumin, the primary active compound in turmeric, is one of the best-researched phytochemicals for depression.

Creatine is best known as a sports supplement, but it also plays a critical role in brain energy. 

The brain is one of the most metabolically demanding organs, and coenzyme Q10 (CoQ10) provides that power through adenosine triphosphate (ATP) production in the mitochondria.

Cocoa is a dark chocolate extract, and most of its trials were funded by big candy.

Citicoline is a synthetic combination of choline and cytidine, two natural compounds that are essential to brain health. 

Chasteberry is a well-established herb for premenstrual symptoms, where it improves irritability, sleep, mood swings, headache, bloating, and breast pain. 

Chamomile has been used for thousands of years as a calming tea.

Cannabidiol (CBD) is the main non-intoxicating compound in cannabis.