Hopefully you purchase the valerian "standardized" extract...they're a little more expensive but worth it.
Melatonin is a cortisol antagonist, and a great sleep aid but can magnify depressive tendencies if you have them.
I have the GNC "fingerprinted" valerian root caps, which just made me pull my magnifying light down to look closely for the first time. No fingerprints unless that is the horsey smell. I have the PharmAssure Melatonin 3mg tablets. There is vitamin B-6 (Pyridoxine HCL) mixed with it 3/2 and smells normal.
One of each together helps me sleep nice with some vegetable juice. Works for me! I must wake up at 4 AM and switched to tea instead of coffee. If melatonin magnifies depressive tendencies at 4AM, that's for the observer, not the observed. I have work to do. If you're standing around observing, I may make you do something.
I should have read up the thread a little. I posted (later) exactly what you said about getting "standardized" extract. We have helped a fellow freeper.