Because research makes me happy:
What serotonin looks like in polarized light.
According to the page the picture is on, "serotonin is biosynthesized from the amino acid tryptophan.... It also acts as a precursor to melatonin in the pineal gland where it is important in the regulation of sleep and circadian rhythms."
So tryptophan --> serotonin --> melatonin
Some ways to help your body make serotonin:
natural sunlight
B vitamins -- all of'em
Vitamin C
Magnesium (esp. with B6)
Omega-3 fatty acids
fruits and starchy complex carbohydrates like potatoes
5-HTP
This site says that "5-HTP also needs vitamin B6, niacin, and magnesium to help it convert to serotonin."
Here's an article about 5-HTP from a depression community site:
5-HTP and the Serotonin Connection According to the article, my above chart should read: tryptophan --> 5-HTP --> serotonin
This site says "Vitamin B6, or pyridoxine, is the cofactor for enzymes that convert L-tryptophan to serotonin and L-tyrosine to norepinephrine. Consequently, vitamin B6 deficiency might result in depression."
The same site also states of Vitamin C: "Vitamin C, as the cofactor for tryptophan-5-hydroxylase, catalyzes the hydroxylation of tryptophan to serotonin. Vitamin C may therefore be valuable for patients with depression associated with low levels of serotonin."
(I wish I had known all this when I was in the grips of my bout of depression last year... Not that I would have done anything about it -- being depressed and all.)