The Library · Vol. 01Entry No. 26· Chapter 03

L-Tyrosine

4-hydroxyphenylalanine

A non-essential amino acid and precursor to dopamine, norepinephrine, and epinephrine — the catecholamine neurotransmitters that drive motivation, focus, and stress resilience.

1
Active compounds
2
In our products
03
Nootropics & Brain
L-Tyrosine (4-hydroxyphenylalanine)

4-hydroxyphenylalanineBotanical illustration

§ 1The molecules

Active compounds.

No.01

L-Tyrosine

Why this matters

  • 01Precursor to dopamine and norepinephrine for motivation and focus*
  • 02Supports cognitive performance under stress and sleep deprivation*
  • 03Supports thyroid hormone production*

*These statements have not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease.

From the Library · Vol. 01

Know exactly what
you're taking.

Every compound in your stack — sourced, dosed, and cited. No proprietary blends. Browse the science behind the bottles.

125Ingredients
189Compounds
14Chapters
Browse by chapter
Compounds that support cognitive function.Showing 2 of 2 · View all

We publish every dose, every source, every paper we leaned on. An informed customer is our only kind.

Browse the full library

— End of entry

Put L-Tyrosine to work.

Browse the products it’s in, or build a stack around the goal it serves best.