L-tyrosine is the building block for dopamine and noradrenaline. It is used for focus under short-term stress.
Calculator Official intake Study doses Best form Safety Sources
This is not an essential nutrient, so there is no official daily intake. Only study doses are shown.
These are doses tested in research, not personal advice. Some exceed the upper limit because they were short courses or given under medical care.
100 mg per kg of body weight as a single dose before the task or exercise
In 16 young adults, one dose of 100 mg per kg body weight improved two stress-sensitive tasks during loud noise. A review concluded tyrosine helps thinking only in short, stressful or demanding situations, not for exercise or as a treatment.
Meat, fish, eggs, dairy, soy, nuts. The body also makes it from phenylalanine.
Avoid with MAO inhibitors and with thyroid medicine unless your doctor agrees.
Single study doses are large (several grams). People with an overactive thyroid should avoid it.
Pregnant, breastfeeding, on medication, or managing a health condition? Check with a doctor or pharmacist before starting a supplement.
Values checked: November 12, 2026.
Independent summaries to read alongside this page. PillMath is not affiliated with these sites.