Supplement·Interactions·Reviewed June 9, 2026
L-Tyrosine interactions.
L-Tyrosine has 12 documented interactions in the NutriStack database: 1 to avoid or watch closely, 3 that need timing or caution, and 8 that work synergistically. The full list, with what each pairing does, is below.
L-Tyrosine at a glance.
A quick, data-grounded summary. The full table is below.
L-Tyrosine has 12 documented interactions in the NutriStack database: 1 to avoid or watch closely, 3 that need timing or caution, and 8 that work synergistically. The full list, with what each pairing does, is below.
Everything that interacts with l-tyrosine.
Every supplement and medication in the NutriStack database with a documented interaction with this substance, highest-severity first. Open any pair for the mechanism and sources.
| Substance | Interaction | What happens |
|---|---|---|
| L-Tryptophan | Conflict | Tyrosine and tryptophan compete with each other (and with other large neutral amino acids) for transport across the blood-brain barrier;... |
| 5-HTP | Caution | L-Tyrosine (a catecholamine precursor) and 5-HTP (a serotonin precursor) compete for the same blood-brain-barrier transporter, and unbalanced... |
| BCAAs | Timing Sensitive | People take L-tyrosine to support catecholamine production for focus, alertness, and stress resilience. Because tyrosine and BCAAs share the same... |
| Levodopa/Carbidopa | Timing Sensitive | L-tyrosine is a large neutral amino acid and can theoretically compete with levodopa for intestinal and blood-brain barrier transport when taken in... |
| Iodine | Synergy | Iodine and L-tyrosine are the two raw materials the thyroid combines to build thyroid hormone, so adequacy of both supports normal hormone synthesis. |
| Iron | Synergy | Iron is a cofactor for tyrosine hydroxylase, the rate-limiting enzyme in dopamine synthesis. |
| Iron Bisglycinate | Synergy | Iron Bisglycinate is a cofactor for tyrosine hydroxylase, the rate-limiting enzyme in dopamine synthesis. |
| L-Theanine | Synergy | L-Tyrosine supports catecholamine production for alertness under stress while L-theanine promotes calm focus, so the pair tends to deliver activated... |
| Rhodiola Rosea | Synergy | Rhodiola inhibits MAO and COMT, reducing dopamine/norepinephrine breakdown. L-tyrosine provides the precursor. Together they increase catecholamine... |
| Vitamin B6 | Synergy | Vitamin B6 (PLP) is a required cofactor for tyrosine hydroxylase, which converts L-tyrosine to L-DOPA in the dopamine synthesis pathway. |
| Vitamin C | Synergy | Vitamin C is a cofactor for dopamine beta-hydroxylase, which converts dopamine (from tyrosine) to norepinephrine. |
| Vitamin C Liposomal | Synergy | Vitamin C Liposomal is a cofactor for dopamine beta-hydroxylase, which converts dopamine (from tyrosine) to norepinephrine. |
The full l-tyrosine profile.
Benefits, dosing by goal, forms, and the cited evidence for this supplement.
Common l-tyrosine questions.
Quick answers drawn from the table above.
What interacts with L-Tyrosine?
In the NutriStack database, L-Tyrosine has 12 documented interactions with other supplements and medications. The most notable include L-Tryptophan, 5-HTP, BCAAs, Levodopa/Carbidopa, and Iodine.
What should you not take with L-Tyrosine?
L-Tyrosine is flagged against 1 substance in the database, including L-Tryptophan. Review these with a clinician before combining, especially alongside prescription medications.
What works well with L-Tyrosine?
L-Tyrosine pairs synergistically with Iodine, Iron, Iron Bisglycinate, L-Theanine, and Rhodiola Rosea in the NutriStack database. Synergy still depends on dose and timing; open any pair for the detail.
Can you take L-Tyrosine with L-Tryptophan?
NutriStack classifies the L-Tyrosine and L-Tryptophan pairing as conflict: Tyrosine and tryptophan compete with each other (and with other large neutral amino acids) for transport across the blood-brain barrier; co-administration blunts the... Separate by 2 to 3 hours. Tyrosine in morning for catecholamine support; tryptophan or 5-HTP at night for serotonin and sleep.
Check your whole stack
See how l-tyrosine fits your routine.
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