My goto site for supplements is http://www.informationisbeautiful.net/visualizations/snake-o...
It essentially ranks supplements based on the amount of research there is to support the claim (so the same supplement can show up in multiple categories). You can see Vitamin D is backed by a lot of research for various ailments, but the category for which there is least evidence is mood related disorders.
On a side note, be very wary of the supplements you take (in the US). There is virtually no oversight in their manufacture, and various groups' investigations have shown that the claimed dosage can be way, way off. And the inactive ingredients may be false as well. Relying on well known companies did not seem to make a difference.
I recall an interview with a pharmacist at a hospital that had decided they test the supplements they had in stock - given that they were giving them to patients. They were rather shocked.
If anyone has a good resource where a group tests different manufacturers' supplements and has some kind of reliability rating, I'd love to know. I pretty much stopped taking supplements when I saw how unreliable the claimed dosages were.