Stacking guide
What goes well with L-Tyrosine?
Evidence-graded stacking partners for L-Tyrosine. Synergistic and neutral combinations are listed alongside pairings to avoid. Use this to design a deliberate stack rather than experimenting blind.
Safe to stack with L-Tyrosine (3)
- CaffeineEVIDENCEA
The most widely consumed psychoactive substance in human history — roughly 80% of the global population uses it daily, mostly via coffee and tea. A competitive adenosine receptor antagonist that lifts the brake on dopamine and norepinephrine signalling. The canonical pairing is 100 mg caffeine + 200 mg L-theanine for clean focus without the jitter.
Common morning combo for catecholamine support.
- ModafinilEVIDENCEA
A eugeroic — a wakefulness-promoting compound — originally developed for narcolepsy. The most-studied prescription cognitive enhancer outside of ADHD treatment. Produces 12–15 hour windows of sustained alertness without the euphoria, abuse potential, or cardiovascular load of amphetamines. Prescription-only in nearly every jurisdiction.
L-Tyrosine supports DA precursor; complements modafinil's DA reuptake inhibition.
- Rhodiola RoseaEVIDENCEA
An Arctic adaptogen used for centuries in Siberian, Scandinavian, and Tibetan traditional medicine. The most-evidenced natural intervention for stress-induced mental fatigue and mild depression. Activating, not calming — take in the morning only, otherwise it disrupts sleep.
Common AM combination.
Combine with caution (2)
- L-TryptophanEVIDENCEB
Essential amino acid precursor to serotonin and melatonin. Used for sleep and mood support.
Both compete for LAT-1 transport into brain. Take at separate times of day.
- 5-HTPEVIDENCEB
Direct serotonin precursor, one step closer than tryptophan. Sourced from Griffonia simplicifolia seeds.
Same LAT-1 competition — separate timing.
Build a stack: use the Stack Builder with L-Tyrosine pre-selected, or check any specific pairing in the Interaction Checker.
Stacking guidance reflects curated interaction rules from the published literature, traditional use, and well-characterised mechanisms. Individual response varies; introduce one substance at a time and track effects. Not medical advice — see our disclaimer.