Amino Acids

[David Gross]

As a vegetarian, I am somewhat careful to maintain a balance of amino acids
in my diet.  Although the need for this much caution for vegetarians has been 
downplayed recently; I still read the old vegetarian scare-lit which says
"Combine your proteins or else"
 
Anyway, I know that a deficiency of certain amino acids can drastically alter
brain function -- causing depression, etc.
 
What I was wondering:  Can over-the-counter amino acid supplements have any
effect on mood, either thereputic or recreational?