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L-tyrosine
L-tyrosine is a precursor to neurotransmitters like dopamine and norepinephrine, enhancing cognitive function under stress.
Clinical Dose: 1gFound in: 552 products
What Does L-Tyrosine Do?
L-Tyrosine is a non-essential amino acid and precursor to the catecholamines dopamine, norepinephrine, and epinephrine. It is a key focus and mood ingredient in pre-workouts.
- Enhanced Focus Under Stress: Replenishes catecholamine stores depleted during intense physical or mental stress.
- Improved Cognitive Performance: Supports working memory, attention, and mental clarity.
- Mood Support: As a dopamine precursor, it may support motivation and well-being during demanding training.
- Synergy with Caffeine: Often paired with caffeine to extend and smooth out stimulant effects.
Clinical vs. Gym Bro Dosing
| Tier | Dose | Notes |
|---|---|---|
| Clinical Minimum | 500 mg | Mild cognitive support |
| Standard Effective | 1,000–2,000 mg | The research-backed range for stress and focus |
| High Performance | 2,000–3,000 mg | Common in focus-heavy pre-workout formulas |
| NALT Alternative | 300–600 mg | N-Acetyl-L-Tyrosine is more bioavailable but less studied |
Key Insight: Free-form L-Tyrosine at 1–2g is the preferred form. NALT (N-Acetyl L-Tyrosine) is sometimes used but has lower conversion rates.
Side Effects & Warnings
- Generally Safe: L-Tyrosine is well-tolerated at standard doses.
- Headache: Rare, but possible at very high doses.
- Interaction with MAOIs: Tyrosine can interact with monoamine oxidase inhibitors. Do not combine.
- Thyroid Medication: Tyrosine is a precursor to thyroid hormones. Consult a physician if on thyroid medication.
Contraindications: Individuals taking MAOIs or thyroid medication should consult a doctor before supplementing.
Top Products Containing L-tyrosine
Sorted by popularity. Dosage shown per serving.
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