# Dl-phenylalanine

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**Safety rating:** UNKNOWN
**CAS number:** 150-30-1
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

DL-phenylalanine is a synthetic amino acid used as a flavoring agent and flavor enhancer in food products. It is the racemic mixture of D- and L-phenylalanine isomers and functions to improve or modify the taste profile of various foods and beverages.

## Regulatory status

| Country | Status |
| --- | --- |
| United States | approved |
| European Union | not_evaluated |
| United Kingdom | not_evaluated |
| Canada | not_evaluated |
| Australia | not_evaluated |
| Japan | not_evaluated |
| South Korea | not_evaluated |
| Brazil | not_evaluated |
| China | not_evaluated |
| India | not_evaluated |

## Detailed analysis

## What is DL-Phenylalanine?

DL-phenylalanine (CAS Number: 150-30-1) is a synthetic form of the amino acid phenylalanine, consisting of equal parts of the D- and L-isomers. Phenylalanine is a naturally occurring amino acid found in protein-containing foods, but the DL-form is chemically synthesized for use as a food additive. The compound appears as a white to off-white crystalline powder and is soluble in water.

## Common Uses

DL-phenylalanine is classified as a flavoring agent and flavor enhancer in the food industry. It is used in various food and beverage applications to enhance or modify taste characteristics. Like other amino acids used in food, it contributes to umami taste perception and overall flavor profile development. The compound may be found in processed foods, beverages, seasonings, and flavor systems where taste enhancement is desired.

## Safety Assessment

According to FDA records, there have been zero adverse events reported related to DL-phenylalanine and zero product recalls associated with this additive. This absence of reported safety incidents suggests a favorable safety profile in commercial food use.

It is important to note that DL-phenylalanine has not been granted GRAS (Generally Recognized As Safe) status by the FDA, which means it has not undergone the formal GRAS determination process. However, the lack of GRAS status does not automatically indicate safety concerns; rather, it reflects the regulatory pathway and assessment status of the ingredient.

For individuals with phenylketonuria (PKU), a rare genetic metabolic disorder, phenylalanine-containing substances require careful monitoring as part of their dietary management. This is a well-established medical consideration for all phenylalanine sources.

## Regulatory Status

DL-phenylalanine's regulatory status varies internationally. In the United States, while it lacks GRAS designation, it may be used in food under specific regulatory frameworks. The FDA maintains oversight of food additive safety and efficacy.

Regulatory agencies in other countries may have different classifications and approval status for this ingredient. Manufacturers using DL-phenylalanine must comply with applicable regulations in their respective markets and properly declare its presence on product labels.

## Key Studies

Phenylalanine as an amino acid has been extensively studied in nutritional and biochemical research. The D-isomer of phenylalanine has been the subject of scientific investigation regarding potential flavor-enhancing and sensory properties. L-phenylalanine is a standard amino acid in protein biochemistry and human metabolism.

While DL-phenylalanine is a synthetic combination, its safety profile is informed by extensive knowledge of phenylalanine metabolism and the established safety of amino acids as food components. The absence of reported adverse events in FDA databases, combined with zero recalls, indicates no documented safety issues in typical food use contexts.

Further research may provide additional data on sensory thresholds, optimal usage levels, and specific applications where DL-phenylalanine proves most effective as a flavoring agent.

## Sources

- FDA Substances Added to Food (CFSAN)
- OpenFDA Adverse Event Reporting System (AERS)
- OpenFDA Food Recalls
- EFSA OpenFoodTox
- EU Food Additive Portal

## Citation

Additive Facts. "Dl-phenylalanine — Safety, regulation, and evidence." https://additivefacts.com/additives/dl-phenylalanine. Accessed 2026-05-19.