"VITAMIN D!" (or another reason to take fish oil)

Vitamin D is one of the most important vitamins for the brain. Low Vitamin D can present as mental health symptoms including poor attention, depression, fatigue, loss of hair (whoops, better check my level, and here I've been rubbing Rogaine on my head for 10 years). Natural sources of vitamin D are rare. Despite what you may think, milk is not a natural source. D is artificially added to milk because Americans eat like crap and most kids would get rickets without it. You can get D from going out in the sun more often and eating more fish especially salmon. If you eat crap and stay inside, take a Vitamin D supplement 2000IU per day or cod liver oil (yes it tastes bad, get over it).