Sad and tired? This supplement can ease seasonal depression

Feeling down is trending up.

The days are getting colder and shorter, and instances of seasonal depression are on the rise.

Starting as early as November, those who struggle with seasonal depression have little sunlight to brighten their spirits on dark days.

Formally known as seasonal affective disorder (or, appropriately, SAD), seasonal depression is spurred by the change of the season, most commonly during the fall and winter months, when daylight wanes, sleep is disrupted and isolation increases.

“Seasonal depression is thought to be caused by changes in your body’s internal clock or circadian rhythm,” Dr. Judith Joseph , a board-certified psychiatrist, researcher and bestselling author of “High Functioning,” told The Post.

Sunlight passing through the retina helps regula