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L-Tyrosine Powder

Source Naturals
4.7
★ ★ ★ ★ ★
(707 ratings)
Tyrosine 660 mg
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Score85
The core formula provides a clearly defined role with practical strengths. A quarter-teaspoon measure is less exact and less convenient than a premeasured capsule.
How scoring works
Quantity:3 Ounce(s) • (149 servings)
Goals:
Brain Health

Score 85

The core formula provides a clearly defined role with practical strengths. A quarter-teaspoon measure is less exact and less convenient than a premeasured capsule.
How scoring works
$6.79($0.04 per serving)
Vitacost
$ 11.79
iHerb
$ 14.59
Pure Formulas
$ 6.79
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Analysis

Bulk L-tyrosine powder supplies a meaningful 660 mg serving with excellent cost efficiency. Flexible measurement suits users who want to adjust intake for acute mental demand.

A quarter-teaspoon measure is less exact and less convenient than a premeasured capsule. No branded source, fermentation detail, purity grade, or testing assurance is supplied.

It fits value-focused users comfortable measuring powder for situational use. The product remains a single neurotransmitter-precursor pathway rather than broad brain support.

Who is it for
  • value-focused users comfortable measuring powder for situational use
  • Adults who understand the formula’s focused role
  • Users comfortable with the stated limitations
Best for
  • Flexible tyrosine dosing
  • Strong cost efficiency
  • Acute mental-demand support

Pros

  • Meaningful 660 mg amount
  • Excellent value per gram
  • Flexible powder format

Cons

  • Less precise household measurement
  • No sourcing or purity details
  • Narrow cognitive coverage

Warnings

  • L-tyrosine may conflict with levodopa, MAO inhibitors, or thyroid-hormone treatment
  • People with hyperthyroidism should avoid unsupervised tyrosine use
  • Tyrosine can feel stimulating or cause digestive upset in sensitive users

Nutrient quality

91 Highest impact

Free-form L-tyrosine is supplied at a meaningful but reasonable amount. The single-active powder is focused and free of obvious low-value additions.

Ingredient transparency

84 Highest impact

The active ingredient and amount are clearly disclosed without a hidden blend. Measuring powder is less exact, and full intake directions and non-active details are absent.

Customer satisfaction

67 High impact

The aggregate rating is strong, and the review volume gives moderate confidence in it. No detailed feedback is supplied to assess recurring complaints or purpose-specific experiences.

Value for money

97 Highest impact

A meaningful amount and large bulk supply provide excellent effective-serving value. It compares especially well with similar focused tyrosine products.

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Goals

Brain Health
Brain Health
Impact
Highest effect
B Goal FitA Strength of SupportC CoverageA+ Formula Quality

L-tyrosine at 660 mg supports catecholamine production and may preserve mental performance during acute stress or sleep loss. Evidence is most relevant under demanding conditions rather than routine memory enhancement.

The standalone powder clearly discloses a meaningful amount and allows flexible use. Its focused neurotransmitter pathway lacks broader structural, energy, or neuroprotective support.

Study evidence
Tyrosine Supportive 7 studies

Ingredients

IngredientAmount per serving
L-Tyrosine
660 mg
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
Tyrosine · 660 mg OverallScore88
B- Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyA+ Value

The 660 mg L-tyrosine serving uses the standard form and sits comfortably within the target range. The label clearly states the active amount, but it provides no branded-source, purity-grade, fermentation, or testing details. Bulk powder delivers excellent cost efficiency, though measuring a quarter teaspoon is less exact than taking a premeasured capsule.

View ingredientView products
Loading alternative details
92 Performance

L-Tyrosine 500 mg

Natural Factors
Its disclosed serving supplies 1,000 mg L-tyrosine with 50 mg calcium. The larger tyrosine amount and strong brain-health alignment provide more substantial single-serving support than the original tyrosine powder, without making cost the deciding factor.
91 Performance

L-Tyrosine 750 mg - Extra Strength

NOW
Its focused capsule supplies 750 mg L-tyrosine per serving. The larger focused dose and strong nutrient-quality evidence make it a more capable option than the original tyrosine powder, without making cost the deciding factor.
89 Performance

L-Tyrosine 500 mg

Jarrow Formulas
Its focused capsule supplies 500 mg L-tyrosine per serving. Its strong brain-health alignment and fully disclosed single-active design compare favorably with the original tyrosine powder, without making cost the deciding factor.
93 Budget

L-Tyrosine

NOW
Its liquid supplies 350 mg L-tyrosine per serving across 323 servings. Only no eligible candidates are strictly cheaper, so this is one of the closest low-cost allowed matches to the original tyrosine powder.
90 Budget

Best L-Tyrosine 500 mg

Doctor's Best
Its veggie capsule supplies 500 mg of explicitly identified L-tyrosine across 120 servings. Only no eligible candidates are strictly cheaper, so this is one of the closest low-cost allowed matches to the original tyrosine powder.
88 Budget

L-Tyrosine 500 mg

Swanson
Its capsule supplies 500 mg L-tyrosine in a focused single-active formula. Only no eligible candidates are strictly cheaper, so this is one of the closest low-cost allowed matches to the original tyrosine powder.
95 Value

L-Tyrosine 500 mg

NOW
Its focused capsule supplies 500 mg L-tyrosine across 120 servings. Its strong collection fit and value evidence give it a better quality-to-cost balance than the original tyrosine powder.
86 Value

L-Tyrosine 500 mg

Solgar
Its focused capsule supplies 500 mg L-tyrosine per serving. Its focused formula and strong ingredient transparency preserve quality while offering competitive value against the original tyrosine powder.
87 Value

L-Tyrosine 500 mg

Source Naturals
Its tablet supplies 500 mg L-tyrosine with 114 mg calcium. Its disclosed tyrosine amount and solid value evidence offer a practical balance compared with the original tyrosine powder.
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Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Effect of tyrosine supplementation on clinical and healthy populations under stress or cognitive demands--A review.
    Jongkees BJ; Hommel B; Kühn S; Colzato LS · Journal of psychiatric research · 2016
    Narrative reviewBrain Health forTyrosine
  2. Baseline-dependent effect of dopamine's precursor L-tyrosine on working memory gating but not updating.
    Jongkees BJ · Cognitive, affective & behavioral neuroscience · 2021
    Randomized trial45 participantsBrain Health forTyrosine
  3. Dietary Tyrosine Intake (FFQ) Is Associated with Locus Coeruleus, Attention and Grey Matter Maintenance: An MRI Structural Study on 398 Healthy Individuals of the Berlin Aging Study-II.
    Plini ERG; Melnychuk MC; Harkin A; Dahl MJ; McAuslan M; Kühn S; Boyle RT; Whelan R; Andrews R; Düzel S; Drewelies J; Wagner GG; Lindenberger U; Norman K; Robertson IH; Dockree PM · The journal of nutrition, health & aging · 2023
    Cross-sectional study398 participantsBrain Health forTyrosine
  4. Combined L-carnosine and L-tyrosine supplementation as an ergogenic strategy for physical and cognitive performance under fatigue in professional football players.
    Bilgin S; Bozyılan E; Buzdağlı Y; Karaç Öcal Y; Gürkan O; Toktaş S; İnan H; Egil İ; Yarayan YE · Frontiers in nutrition · 2026
    Randomized trial24 participantsBrain Health forTyrosine
  5. Influence of nutritional tyrosine on cognition and functional connectivity in healthy old humans.
    Hensel C; Becker M; Düzel S; Demuth I; Norman K; Steinhagen-Thiessen E; Gallinat J; Lindenberger U; Kühn S · NeuroImage · 2019
    Cross-sectional study286 participantsBrain Health forTyrosine