Source Naturals DL Phenylalanine - 30 Tablets
- Helps inhibit the action of an enzyme that breaks down endorphins and enkephalins
- Extends 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
- 1 tablet 1 to 3 times daily.