L-Tyrosine Powder®
Amino Acids & ProteinBrand: Source Naturals
Functions
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.
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
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
| Ingredient | Amount Per Serving | |
|---|---|---|
| L-Tyrosine | 660 mg | — |
Not Present
Target Groups
Label Claims
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
Source Naturals L Tyrosine
Vitacost.com4.8(569)$14.59LowestBest Naturals L- Tyrosine Pure Powder
Target5.0(1)$14.99Now Foods L- Tyrosine Powder
DPS Nutrition4.7(422)$15.99Source Naturals L-Tyrosine Free-Form Powder 3.53 oz (100 g)
GoSupps.com4.8(569)$44.99Nutricost L- Tyrosine Powder
Walmart - eSupplements, llc4.8(881)$18.95BulkSupplements 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
Vitaminstore Roma
4.8 (154)Vitamin & supplements store
Via Tor de' Schiavi, 265c, 00171 Roma RM
Rootminded - Ashwagandha Italia
5.0 (1)Vitamin & supplements store
Via in Lucina, 7, 00186 Roma RM
NUTRITION LAB
5.0 (221)Vitamin & supplements store
Via Cornelia, 116, 00166 Roma RM
Nutragenix - Integrazione Innovativa
4.9 (68)Vitamin & supplements store
Largo Messico, 7, 00198 Roma RM
Nutriwellness Integratori Alimentari
4.9 (37)Vitamin & supplements store
Via Trionfale, 8286, 00135 Roma RM
Vitamina
4.9 (219)E-commerce service
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 citationsEffect 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 citationsOral 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 citationsDietary 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 citationsTyrosine 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 citationsDietary 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.
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