L-Tyrosine
L-tyrosine is an amino acid that the body obtains from protein-rich foods and can also produce from another amino acid, phenylalanine. In the body, tyrosine is a building block for proteins and is also used to produce several neurotransmitters and thyroid hormones. In supplements it is most commonly available in capsules, as well as powder and combination formulas with other amino acids. This category includes L-tyrosine in different forms and strengths, including N-acetyl-L-tyrosine. Before buying, check the form of tyrosine and the amount per serving.
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What is L-tyrosine?
Tyrosine is a conditionally non-essential amino acid: the body can produce it from phenylalanine and also obtains it from food. Tyrosine is one of the building blocks of proteins. It is also used to produce dopamine, noradrenaline and adrenaline, thyroid hormones and the pigment melanin.
The letter L refers to the naturally occurring form of the amino acid used by the body to build proteins.
Does L-tyrosine have proven benefits?
Tyrosine is often associated with concentration, mood and performance under stress because it is used to produce important neurotransmitters. These areas are being studied, but there are no authorised EU health claims for L-tyrosine supplements. For that reason, we do not promise a specific effect and instead explain what the substance is and how to choose a suitable product.
L-tyrosine or N-acetyl-L-tyrosine
- L-tyrosine - the classic and most common form used in supplements.
- N-acetyl-L-tyrosine (NALT) - a modified form that is more soluble in water. It is often used in liquid products and combination formulas.
The form is always stated in the ingredients. Doses of the two forms are not directly comparable, so follow the directions for the specific product.
How to choose L-tyrosine
- Format. Capsules are convenient for precise dosing without flavour, while powder offers more flexibility and is often more economical per gram.
- Amount per serving. Capsules commonly contain around 500 mg of L-tyrosine, although other strengths are also available.
- Ingredients. If you only want tyrosine, choose a single-ingredient product. Tyrosine is also combined with L-theanine and other ingredients, so check the full formula.
Frequently asked questions
Is L-tyrosine a hormone?
No. L-tyrosine is an amino acid. The body uses it to produce certain hormones, including thyroid hormones, but tyrosine itself is not a hormone.
Does L-tyrosine help with weight loss?
No. There are no authorised health claims that L-tyrosine affects body weight, and it is not a weight-loss product.
Who should not take L-tyrosine without medical advice?
People with thyroid conditions or taking thyroid hormones, people taking MAO inhibitor antidepressants or levodopa, and people with high blood pressure should seek medical advice before use. Medical advice is also recommended during pregnancy, breastfeeding and regular medication use.
Explore other amino acids in the Amino Acids category.