Although I was not able to find any info about Fontana SF Syrups...many varieties out there but seems not much listed for Fontana...maybe someone else who has a Starbuck"s handy could investigate this ...was able to find some info in regards to Phenylalanine:

Phenylalanine is an essential amino acid that is a neuro-transmitter (a chemical that transmits signals between the nerve cells and the brain) used to promote alertness. Because of its relationship to the action of the central nervous system, this amino acid can elevate mood, decrease pain, aid in memory and learning, and suppress the appetite.

Phenylalanine is available in three different forms, designated L-, D-, and DL-. The L- form is the most common type, and is the form which is incorporated into the body's proteins. The D-type acts as a painkiller. The DL- form is a combination of the two forms. The D form being a painkiller has been known to help such symptoms as arthritis.

The best natural sources are soy products, cottage cheese, dry skim milk, almonds, peanuts, lima beans, pumpkin, and sesame seeds.

Supplemental phenylalanine should not be taken by pregnant women or by people who suffer from anxiety attacks, diabetes, high blood pressure, phenylketonuria (PKU), or preexisting pigmented melanoma.


Bonnie