Valerian works great for many people. Unfortunately, when I was very mercury toxic, it made me depressed after about 3 days.

You may benefit from multiple ways from tryptophan, especially if your mercury toxic because it is a Serotonin precursor.

Ever notice how people get sleepy after turkey dinner. It's the high levels of tryptophan found in turkey.

There is a lot of (past) debate over (even more) FDA gameplaying on the subject of tryptophan. They went through a lot of trouble to make it harder to get for human consumption. Just like with ephedra, numbers were skewed and lies did abound within the FDA.

Nevertheless, although it's harder to get, it's still available. I use it occasionally.