L-tryptophan was a very popular supplement before anyone ever heard of NAD precursors.
Improved Mood: Tryptophan is a precursor to serotonin, which is often referred to as the “feel-good” neurotransmitter.
Enhanced Sleep: Tryptophan is also a precursor to melatonin.
I keep it on the shelf and take it occasionally. It is also something you can take to help get back to sleep if you wake up in the middle of the night.
Of course, individual results will vary, but I find 2 or 3 grams on an empty stomach quite mellowing.