L-Phenylalanine 500 mg®
Amino Acids & ProteinBrand: Best Naturals
Functions
Net Contents
90 Tablet(s)
Serving Size
1 Tablet(s)
Servings Per Container
180
Supplement Form
Tablet or Pill
Bar Code (UPC/SKU)
8 17716 01422 7
Product Version
Not Present
Label Analysis
Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.
Single-ingredient formula listed in Supplement Facts.
Every active ingredient discloses a specific amount per serving.
Label states: 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
Free From
- Milk
- Egg
- Fish
- 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 Tablet(s) · 1–3 per day
| Ingredient | Amount Per Serving | |
|---|---|---|
| L-Phenylalanine | 500 mg | — |
Not Present
Other Ingredients
Target Groups
Label Claims
Directions & Suggested Use
Suggested/Recommended/Usage/Directions
Suggested use: As a dietary supplement, take one (1) tablet one to three times daily as needed, preferably between meals.
Warnings & Precautions
Precautions re: Children
Keep out of the reach of children.
Precautions re: All Other
Do not use if safety seal is broken or missing.
Storage
Storage
Keep in a cool, dry place.
Formulation
Formula re: Contains
L-Phenylalanine, an essential amino acid, is a precursor of the amino acid tyrosine and a whole series of neurotransmitters and hormones. Because tyrosine is necessary for the synthesis of proteins and production of the nuerotransmitters dopamine and norepinephrine, L-Phenylalanine is also a direct precursor of PEA (phenylethylamine), another important neurotransmitter. Phenylalanine is an extremely important nutrient that must be obtained through the diet or by supplementation. Certain research publications indicate that L-Phenylalanine may help support the following: Supports nervous system Supports positive mood Supports an alert state
Formulation re: Other
Premium formula 3rd party lab tested
Formulation re: Does NOT Contain
No artificial color, flavor or sweetener, no preservatives, no sugar, no starch, no corn, no soym, no egg, no milk, no lactose, no gluten, no wheat, no yeast, no fish. Sodium free.
FDA Statements
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.
FDA Statement of Identity
Dietary Supplement
Other Label Statements
Seals/Symbols
Made in USA
Seals/Symbols
GMP Good Manufacturing Practice Product
General Statements: All Other Content
For additional information call: 1-877-659-5004
Manufacturer & Distributor
Distributor
Best Naturals
PO Box 394, Kenilworth, NJ, 07033, USA
1-877-659-6004
Market Reference
Best Naturals DLPA 500 mg 120 Tablets
Best Naturals4.8(13)$8.99Best Naturals DLPA 500 mg Tablets
Walmart - Best Naturals4.8(21)$13.75Source Naturals L-Phenylalanine 500 mg Tablets
iHerb4.7(125)$9.38(3 pack) Best Naturals Dlpa 500 mg 120 Tablets, White
Walmart - Best Naturals4.8(21)$22.92Source Naturals L-Phenylalanine 500 mg 50 Tablets
Instacart5.0(1)$13.89Pure Naturals L-Phenylalanine 500 Mg 120 Capsules
Walmart - Vitaminshub5.0(1)$8.49L-Phenylalanine Powder
Nootropics Depot$19.99Solaray L-Phenylalanine 500 mg 60 Capsules
Solaray4.7(31)$15.69
Where to Buy Locally
Enter your city or ZIP code to find supplement & health stores in your area that may carry this product.
Showing representative supplement & health retailers — search above for stores in your area.
ITL Health
5.0 (37)Vitamin & Supplements Shop
50 Broadway, London SW1H 0BL
RightNutri
4.9 (78)Vitamin & Supplements Shop
26 Queenstown Rd, London SW8 3RX
British Supplements
3.4 (275)Vitamin & Supplements Shop
34, New House, 67-68 Hatton Garden, London EC1N 8JY
body Supplies
4.1 (301)Vitamin & Supplements Shop
Donk 3a, 2991 LE Barendrecht, Netherlands
Fitandfat
5.0 (321)Vitamin & Supplements Shop
Inside the post office, 187 Uxbridge Rd, London W13 9AJ
London Supplements
3.7 (84)Vitamin & Supplements Shop
13, Waverley Industrial Park Waverley Industrial Estate, Hailsham Dr, Harrow HA1 4TR
Supplemented
4.7 (192)Vitamin & Supplements Shop
Online Retail Ltd Box 1031A, Surbiton, Kingston upon Thames KT1 9AH
Charge Products
2.3 (3)Vitamin & Supplements Shop
Office 1, Charge Products, Industrial Estate, Unit 1, 8 Towerfield Rd, Towerfield Cl, Southend-on-Sea SS3 9QE
Research & Studies
Phenylalanine
S Ryan-Vollmar - Natural Health, 1999 - go.gale.com
… The body metabolizes L-phenylalanine into tyrosine (a … L-phenylalanine also works with tryptophan (an essential … that one to four grams of L-phenylalanine (in combination with vitamin […
1999Emerging therapeutic and cosmeceutical applications of phenylalanine and its metabolites
Z Liao, T Parumasivam, Z Xiao, X Zhu… - Cutaneous and …, 2026 - Taylor & Francis
Objective This review aims to comprehensively examine and integrate the extant knowledge pertaining to phenylalanine (Phe) and its key metabolites, namely tyrosine (Tyr), …
2026The effect of various doses of phenylalanine supplementation on blood phenylalanine and tyrosine concentrations in tyrosinemia type 1 patients
WG van Ginkel, HE van Reemst, NS Kienstra, A Daly… - Nutrients, 2019 - mdpi.com
… mg and 100 mg of L-phenylalanine were prepared by the pharmacy in the University Medical … concentrations while receiving 40 mg/kg/day phenylalanine supplementation, whereas all …
201921 citationsRisk Assessment of" Other Substances"–L-phenylalanine and DL-phenylalanine
L Frøyland, M Haugen, K Holvik, M Løvik… - European Journal of …, 2020 - hal.science
… information on adverse health effects related to intake of L-phenylalanine and no information … 100, 250, 500, 750 and 1000 mg/day L-phenylalanine in food supplements are considered …
20202 citations… of Total Isoflavones in Chickpea (Cicer arietinum L.) Sprouts Germinated under Precursors (p-Coumaric Acid and L-Phenylalanine) Supplementation
J Arora, B Kanthaliya, A Joshi, M Meena, S Meena… - Plants, 2023 - mdpi.com
… Compared to non-treated sprouts, p-CA at 250 mg L −1 and Phe at 500 mg L −1 were viable … into the diet could offer a natural and convenient means of obtaining these health-promoting …
202319 citationsProtein substitutions as new-generation pharmanutrition approach to managing phenylketonuria
FN Keskin, TÖ Şahin, R Capasso… - Clinical and …, 2022 - pmc.ncbi.nlm.nih.gov
… This review discusses the efficacy and safety considerations of basic medical nutrition … of phenylalanine (Phe) caused by a hepatic L-phenylalanine-4-hydroxylase (PAH) enzyme activity …
202212 citations
Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2024-02-22. DSLD Label ID: 306005. 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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