Supports and Alert State. DL-Phenylalanine or DLPA is a 50/50 mixture of the D and L forms of the amino acid phenylalanine (phenylalanine is one of the few amino acids that can be utilized in its D form). Researchers believe that D-phenylalanine (DPA) inhibits the action of an enzyme that breaks down endorphins and enkephalins. These are proteins which bind to opiate receptor sites in the brain thereby influencing the perception of discomfort. By obstructing the action of this enzyme DPA may extend the life of endorphins and enkephalins and their positive influence on comfort levels. L-phenylalanine is the precursor to two neurotransmitters that help support an alert state.
"love this product, I take one right when I wake up--I take another one couple hours later. I wrote on this once before--I'll say it again, clears your tired brain--I am 66--The DLPA---also helps with pain issues, whereas the L-phenylalanine, more appetite depressant---the hippies liked the the L-p----there are no jitters from DLPA--you don't even know you took it for a while, and then you just feel better in your brain---I have never taken in afternoon,because, might keep you awake at night ??"