Researchers have shown how bright light stimulates serotonin production through the retino-raphe tract, resulting in similar reduction of depressive behavior as SSRIs. They've also shown the reverse - that light deprivation produces depressive behavior. Serotonin production is one of the reasons why bright light therapy (BLT) is now used to treat seasonal and non-seasonal depression.
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Boost Your Serotonin and Melatonin Naturally | Somatic Movement Center
