L-Phenylalanine®
Amino Acids & ProteinBrand: Source Naturals
Net Contents
100 Tablet(s)
Serving Size
1–2 Tablet(s)
Servings Per Container
50
Supplement Form
Tablet or Pill
Bar Code (UPC/SKU)
0 21078 00161 4
Product Version
SN0161 REV K102
Label Analysis
Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.
2 distinct active ingredients are disclosed in Supplement Facts.
Every active ingredient discloses a specific amount per serving.
1 ingredients report an established %DV per serving.
Label states: Vegetarian, Gluten-Free.
This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.
Allergen Guide
Contains
- Milk
- Egg
- Wheat
- Soy
- Gluten
Allergen flags are parsed automatically from the official label's claims and statements. Always verify against the physical product label before use, especially if you have a severe allergy.
Supplement Facts
Serving Size: 1–2 Tablet(s) · 1 per day
| Ingredient | Amount Per Serving | % Daily Value |
|---|---|---|
| Calcium | 99 mg | 10% |
| L-Phenylalanine | 1 Gram(s) | — |
Not Present
Other Ingredients
Target Groups
Label Claims
Directions & Suggested Use
Suggested/Recommended/Usage/Directions
Suggested Use: 1 to 2 tablets daily.
Warnings & Precautions
Precautions re: All Other
Do not use if either tamper-evident seal is broken or missing.
Precautions re: Children
Keep out of the reach of children.
Precautions re: Allergies
Warning: Contains phenylalanine.
Precautions re: Pregnant or Nursing or Prescription Medications
Not to be used by phenylketonurics, women who are pregnant, may become pregnant, or breastfeeding, or with antidepressant drugs such as MAOIs or SSRIs.
Precautions re: All Other
Not to be used by phenylketonurics, women who are pregnant, may become pregnant, or breastfeeding, or with antidepressant drugs such as MAOIs or SSRIs. If you have chronic high blood pressure, take after meals and/or consult your health care professional.
Formulation
Formula re: Contains
Warning: Contains phenylalanine.
Formulation re: Vegetarian/Vegan
Suitable for Vegetarians and Hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy or wheat.
Formulation re: Other
Suitable for Vegetarians and Hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy or wheat.
Formulation re: Does NOT Contain
Suitable for Vegetarians and Hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance.
FDA Statements
FDA Statement of Identity
Dietary Supplement
FDA Disclaimer Statement
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.
Other Label Statements
General Statements: All Other Content
Free form
General Statements: All Other Content
An essential amino acid 500 mg
General Statements: All Other Content
L-Phenylalanine, an essential amino acid, is a precursor of the amino acid tyrosine and a whole series of neurotransmitters and hormones. Phenylalanine is first converted to tyrosine, which becomes l-dopa, which converts to norepinephrine, a key neurotransmitter and an adrenal hormone. L-Phenylalanine is also a direct precursor of PEA (phenylethylamine), another important neurotransmitter.
General: Product/Version Code
SN0161 REV K102
Manufacturer & Distributor
Distributor
Source Naturals, Inc.
P. O. Box 2118, Santa Cruz, CA, 95062
Market Reference
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Walmart - BulkSupplements.com4.8(21)$25.97
Where to Buy Locally
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Vitamin Hut
4.8 (16)Vitamin & supplements store
21-23 49th Ave, Long Island City, NY 11101
GNC
4.0 (22)Vitamin & supplements store
23-20 Jackson Ave, Long Island City, NY 11101
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4.3 (163)Vitamin & supplements store
385 5th Ave, New York, NY 10016
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182 Mulberry St # Store, New York, NY 10012
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4.7 (146)Vitamin & supplements store
100 Park Ave, New York, NY 10017
Vitamin Peddler Inc
5.0 (52)Vitamin & supplements store
142 W 83rd St, New York, NY 10024
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5.0 (8)Vitamin & supplements store
261 E 10th St, New York, NY 10009
The Vitamin Shoppe
4.4 (98)Vitamin & supplements store
81-27 37th Ave, Jackson Heights, NY 11372
Research & Studies
Evaluation of Total Isoflavones in Chickpea (Cicer arietinum L.) Sprouts Germinated under Precursors (p-Coumaric Acid and L-Phenylalanine) …
J Arora, B Kanthaliya, A Joshi, M Meena, S Meena… - Plants, 2023 - mdpi.com
Cicer arietinum L. (Bengal gram, chickpea) is one of the major pulse crops and an important part of traditional diets in Asia, Africa, and South America. The present study was conducted …
202317 citations… the catalytic efficiency of a highly thermostable phenylalanine ammonia-lyase from Nostoc sp. ATCC 53789 and its application in producing low L-phenylalanine …
X Han, Y Wang, X Wei, H Yu, S Liu, H Tan, F Xin - Food Chemistry, 2026 - Elsevier
Daily dietary supplementation with low L-phenylalanine (L-Phe) protein is crucial for phenylketonuria (PKU) patients. Phenylalanine ammonia-lyase (PAL) catalyzes L-Phe deamination …
2026Nutrition in phenylketonuria
A MacDonald, JC Rocha, M Van Rijn… - Molecular genetics and …, 2011 - Elsevier
The same basic principles are used to deliver dietary treatment in PKU that was developed sixty years ago. Dietary treatment is undoubtedly very successful, but it has gradually evolved …
2011213 citationsApplication of achiral–chiral two‐dimensional HPLC for separation of phenylalanine and tryptophan enantiomers in dietary supplement
A Lomenova, K Hroboňová - Biomedical Chromatography, 2021 - Wiley Online Library
… In the dietary supplement for relaxing and improving mental health, selected for the purpose … It was found that the tested sample of dietary supplement contained l-phenylalanine and l-…
202119 citationsL-Phenylalanine preharvest spraying effectively enhances the reactive oxygen metabolism and antioxidant capacity in postharvest broccoli
X Wang, T Wang, N Su, W Liu, M Gao, R Li, Y Li… - Plant Physiology and …, 2025 - Elsevier
Broccoli exhibits a high susceptibility to quality deterioration during postharvest storage. Previous studies have shown that preharvest spraying of 2 mmol/L L-phenylalanine (L-Phe) can …
20259 citationsSensing, Uptake and Catabolism of L-Phenylalanine During 2-Phenylethanol Biosynthesis via the Ehrlich Pathway in Saccharomyces cerevisiae
J Dai, H Xia, C Yang, X Chen - Frontiers in microbiology, 2021 - frontiersin.org
… L-Phenylalanine has been proven to be a nonpreferred nitrogen source in S. cerevisiae, and the crucial genes of the Ehrlich pathway are modulated by NCR in the presence of …
202181 citations
Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2017-04-25. DSLD Label ID: 73378. This information is provided for educational reference only and is not medical advice. Always follow the product label and consult a doctor or pharmacist before use.
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