L-Tyrosine
Focus & memoryFunction & benefits
An amino acid the body uses to make dopamine, noradrenaline and thyroid hormones; a clinical review suggests it supports mental performance and working memory in demanding situations, such as sleep loss and heavy mental stress, when these neurotransmitters run low.
Dosage & how to use
| Recommended dose | 500–1000 mg (up to 1500 mg during periods of heavy mental strain) |
| Best time to take | In the morning on an empty stomach, 30 minutes before food, with a glass of water |
| Frequency | Once daily when needed |
Best forms to choose
Free-form L-tyrosine in capsules or powder, or N-acetyl-L-tyrosine (NALT).
Important warnings
Not for people with an overactive thyroid or Graves' disease
Avoid it with melanoma or severe phenylketonuria (PKU)
Avoid during pregnancy and breastfeeding
Drug interactions
Important warning: never combine it with MAO-inhibitor antidepressants because of the risk of a sharp rise in blood pressure; use with care alongside thyroid medication (levothyroxine) and levodopa.
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Scientific references
- Jongkees BJ et al. J Psychiatr Res 2015 (review) — PMID: 26424423
- Deijen JB et al. Brain Res Bull 1999 — PMID: 10230711
Content last updated: 17 October 2026 · Based on published sources and research (EFSA / NIH / PubMed)
⚖️ Medical disclaimer: The information and data provided here are for health education and nutritional guidance only. They are not a medical diagnosis and never replace a direct consultation with your doctor or pharmacist. Always consult your doctor before starting any supplement, especially during pregnancy or breastfeeding or when taking long-term medication.