Amino Acid
L-Tyrosine
Also known as: Tyrosine, L-Tyrosine (Thyroid Support), 4-hydroxyphenylalanine
Precursor to dopamine, norepinephrine, and thyroid hormones. Supports focus and stress resilience.
Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.
Every L-Tyrosine product we have scored
| # | Product | Score | Per serving |
|---|---|---|---|
| 1 | Pure Encapsulations Cognitive Aminos | 91 A | $0.98 |
| 2 | Thorne Thyroid Health Complex | 90 A | $0.33 |
| 3 | Transparent Labs BULK Pre-Workout | 90 A | $1.67 |
| 4 | Pure Encapsulations Iodine and Tyrosine | 90 A | $0.33 |
| 5 | Life Extension Thyroid Support Complex | 90 A | $0.90 |
| 6 | Nutricost Pre-Workout For Women Powder | 89 A | $0.73 |
| 7 | Nutricost Pre-Workout Complex | 89 A | $0.83 |
| 8 | Thorne Emotion Balance Support | 87 A | $1.05 |
| 9 | Pure Encapsulations L-Tyrosine | 87 A | $0.38 |
| 10 | Nutricost L-Tyrosine Capsules | 87 A | $0.09 |
| 11 | Momentous Tyrosine | 87 A | $0.33 |
| 12 | Jarrow Formulas L-Tyrosine (2-Pack) | 87 A | $0.16 |
Scored on dose accuracy, form, label transparency and third-party testing. Per-serving cost is list price divided by servings per container. No brand pays to be listed or ranked.
Common questions
How much L-Tyrosine should I take?
The typical range is 500-2000 mg daily. As needed, cycling may help
When should I take L-Tyrosine?
Morning or before stressful tasks. Away from protein meals.
Which form of L-Tyrosine is best?
Capsules — NALT or L-tyrosine. Other forms in the catalog: Powder, L-Tyrosine powder, NALT (N-Acetyl).
Is L-Tyrosine safe?
Commonly reported: Insomnia if taken late, Anxiety at high doses. Serious warnings: Hyperthyroid caution. Safe
Which L-Tyrosine supplement scores highest?
Pure Encapsulations Cognitive Aminos, at 91/100. Scored on dose accuracy, form, label transparency and third-party testing — no brand pays to be listed or ranked.
Daily target & upper limit
1000 mg / dayL-Tyrosine has an established daily reference intake. See best forms, label synonyms, upper-limit warnings, and top-scoring supplements:
L-Tyrosine dosage reference →Primary uses
- Focus
- Stress resilience
- Thyroid support
- Cognitive performance
- Thyroid hormone synthesis
- Cognitive function
- Dopamine precursor
How it works
- Precursor to L-DOPA then dopamine
- Supports norepinephrine synthesis
- Thyroid hormone precursor
Dosage
- Typical range
- 500-2000 mg daily
- Timing
- Morning or before stressful tasks
- With food
- Away from protein meals
- Duration
- As needed, cycling may help
- Special populations
- High stress, cognitive demands
Forms
- Capsules
- Powder
- NALT (N-Acetyl)
Safety
Common side effects
- Insomnia if taken late
- Anxiety at high doses
Contraindications
- MAOIs
- Hyperthyroidism
Products containing L-Tyrosine
Top-scoring supplements in our catalog that list L-Tyrosine on the label. Each product is graded on Formulate's ingredient-level rubric — dose accuracy, form, transparency, and third-party testing.
Known interactions
Evidence notes
Supports catecholamine synthesis
Grade B: Some human trials support key claims; further confirmation needed.
L-Tyrosine compared head-to-head
Related in Amino Acid
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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.