L-Tyrosine Powder®

Amino Acids & Protein

Brand: Source Naturals

PowderAmino acid/ProteinOn Market
Click to view full label

Net Contents

3.53 Ounce(s)

Serving Size

0.67 Gram(s)

Servings Per Container

149

Supplement Form

Powder

Bar Code (UPC/SKU)

0 21078 00187 4

Product Version

SN0187 REV C201 FG-104781

Label Analysis

Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.

1Active Ingredients

Single-ingredient formula listed in Supplement Facts.

100%Amount Transparency

Every active ingredient discloses a specific amount per serving.

1Dietary Attributes

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

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: 0.67 Gram(s) · 1 per day

IngredientAmount Per Serving
L-Tyrosine660 mg

Not Present

Target Groups

Adult (18 - 50 Years)Gluten FreeDairy FreeSugar Free

Label Claims

NutrientAll OtherStructure/Function

Directions & Suggested Use

Suggested/Recommended/Usage/Directions

Suggested Use: 1/4 teaspoon daily, mixed with water or juice between meals.

Warnings & Precautions

Precautions re: Pregnant or Nursing or Prescription Medications

Not to be used with MAO inhibitor drugs. If you are pregnant, may become pregnant, or breastfeeding, consult your health care professional before using this product.

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: All Other

Warning: Contains tyrosine.

Formulation

Formulation re: Other

Free-form powder

Formula re: Contains

L-Tyrosine is a free-form amino acid which crosses the blood-brain barrier. It is a precursor for the neurotransmitters dopamine, norepinephrine, and epinephrine, as well as for thyroid hormones and enkephalins, important peptides which ease messages of physical discomfort. L-Tyrosine is also a constituent of amino sugars (glycosaminoglycans), which play a role in numerous biological functions.

Formulation re: Does NOT Contain

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

Amino Acid 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

Brand IP Statement(s) re: (c), (TM), (SM)

Copyright SOURCE NATURALS, INC.

Manufacturer & Distributor

Distributor

Source Naturals, Inc.

P. O. Box 2118, Santa Cruz, CA, 95062

Market Reference

$14.59 – $44.99· 6 listings
  • Source Naturals L Tyrosine

    Vitacost.com4.8(569)
    $14.59Lowest
  • Best Naturals L- Tyrosine Pure Powder

    Target5.0(1)
    $14.99
  • Now Foods L- Tyrosine Powder

    DPS Nutrition4.7(422)
    $15.99
  • Source Naturals L-Tyrosine Free-Form Powder 3.53 oz (100 g)

    GoSupps.com4.8(569)
    $44.99
  • Nutricost L- Tyrosine Powder

    Walmart - eSupplements, llc4.8(881)
    $18.95
  • BulkSupplements L- Tyrosine Powder

    Target4.9(87)
    $24.97

Where to Buy Locally

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  • Vitamin Store/All The Best 3.0

    4.9 (37)

    Vitamin & supplements store

    Via Casilina, 251, 00182 Roma RM

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    Via in Lucina, 7, 00186 Roma RM

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    Via Cornelia, 116, 00166 Roma RM

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    Largo Messico, 7, 00198 Roma RM

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    Via Trionfale, 8286, 00135 Roma RM

  • Vitamina

    4.9 (219)

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    Via della Fortezza, 21/A, 51100 Pistoia PT

  • Online shop of supplements USANA: The Cellular Nutrition Company

    Vitamin & supplements store

    V. del Corso, 189, 00186 Roma RM

Research & Studies

  • Natural cognitive enhancers

    N Tabassum, S Rasool, ZA Malik… - Journal of Pharmacy …, 2012 - researchgate.net

    … Ordinary L-tyrosine is less stable and insoluble in water, which may … to L-tyrosine, is 20 times as soluble in water as L-tyrosine itself. For this reason, it serves as an efficient supplement …

    201258 citations
  • Effect of tyrosine supplementation on clinical and healthy populations under stress or cognitive demands—A review

    BJ Jongkees, B Hommel, S Kühn, LS Colzato - Journal of psychiatric …, 2015 - Elsevier

    Consuming the amino-acid tyrosine (TYR), the precursor of dopamine (DA) and norepinephrine (NE), may counteract decrements in neurotransmitter function and cognitive performance…

    2015262 citations
  • Oral tyrosine supplementation improves exercise capacity in the heat

    L Tumilty, G Davison, M Beckmann… - European journal of …, 2011 - Springer

    … It is unclear whether supplementing the amino-acid precursor of dopamine increases exercise capacity in the heat. Eight healthy male volunteers [mean age 32 ± 11 (SD) years; body …

    2011109 citations
  • Dietary supplement for mood symptoms in early postpartum: a double-blind randomized placebo controlled trial

    JH Meyer, ZH Wang, A Santhirakumar, Y Dowlati… - …, 2024 - thelancet.com

    … MAO-A metabolism, and l-tyrosine to replace norepinephrine and dopamine also … l-tyrosine may increase the release of dopamine and norepinephrine 12–14 (also see Supplementary …

    20246 citations
  • Tyrosine for mitigating stress and enhancing performance in healthy adult humans, a rapid evidence assessment of the literature

    S Attipoe, SA Zeno, C Lee, C Crawford… - Military …, 2015 - academic.oup.com

    … Produced in the liver and to some extent the brain, l-tyrosine is synthesized via hydroxylation of phenylalanine, an essential amino acid. Furthermore, l-tyrosine is the precursor of the …

    201575 citations
  • Dietary supplement ingredients for optimizing cognitive performance among healthy adults: a systematic review

    C Crawford, C Boyd… - … Integrative Health, 2021 - journals.sagepub.com

    Background: Dietary supplements promoted for brain health and enhanced cognitive performance are widely available. Claims made for these products are directed not only to the …

    202121 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2022-11-22. DSLD Label ID: 274814. 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.