I started taking 1,000mg of vitamin C per day for my skin and immediately started noticing an elevated, happier mood, for no apparent reason. I have tried many supplements for depression and anxiety over the years and I have to say that staying hydrated and taking vitamin C regularly have proven to be directly related to my ups and downs. I also found the following, which relates vitamin C to seratonin production.
Dr. Hugh Riordan also supports using vitamin C as a treatment for depression. He teaches medicine at the University of Kansas Medical Center. He received the Linus Pauling Award from the American College for Advancement in Medicine. He believes that vitamin C is effective against depression because it increases serotonin production. That's the brain chemical that improves mood and promotes relaxation.
“Medical text books [used] to indicate that one of the most common effects of inadequate vitamin C is depression, " says Dr. Riordan. “But we very seldom go to a psychiatrist who measures our vitamin C level."