Depression coupled with fatigue and extreme irritability are classic signs of a severe iron deficiency — but the miniscule amounts of iron in health food store capsules aren’t enough to reverse it; RED MEAT coupled with supplemental iron can reverse severe depression/fatigue/irritability in mere weeks.
But, not, of course, if the depression is due to other causes.
Don’t forget the correlation between vitamin D (Cholecalciferol) deficiency and depression, too.