ID 1929 -
Tyrozyna
PL: Tyrozyna
EN: L-Tyrosine
Pdf: L-tyrosine
1. Charakterystyka żywności / składnika
The food constituent that is the subject of the health claims is L-tyrosine.
L-Tyrosine is a conditionally indispensable amino acid which occurs naturally in foods, mainly as part of proteins. Dietary L-tyrosine is provided by mixed dietary protein intakes from different sources; it can also be consumed in the form of food supplements. The content of L-tyrosine in foods can be measured by established methods.
The Panel considers that the food constituent, L-tyrosine, is sufficiently characterised.
2.3. Udział w prawidłowym funkcjonowaniu mięśni (ID 1929)
The claimed effect is “essential for muscle function and for optimal muscle contraction”. The Panel assumes that the target population is the general population.
The Panel considers that contribution to normal muscle function is a beneficial physiological effect.
3.3. Udział w prawidłowym funkcjonowaniu mięśni (ID 1929)
Among the references provided, two references were textbooks on the biochemistry of smooth muscle which did not provide original data for the scientific substantiation of the claim. One human study and one in vitro study were unrelated to the claimed effect (e.g. phenylalanine metabolism, and activity of tyrosine hydroxylase from beef adrenal medulla). The Panel considers that no conclusions can be drawn from these references for the scientific substantiation of the claim.
One human study investigated the use of L-tyrosine in the treatment of Parkinson’s disease (Lemoine et al., 1989). The Panel considers that the evidence provided does not establish that results obtained in studies on patients with Parkinson’s disease can be extrapolated to the general population with regard to normal muscle function.
The Panel concludes that a cause and effect relationship has not been established between the consumption of L-tyrosine and contribution to normal muscle function.
Warunki i możliwe ograniczenia stosowania oświadczenia
The daily requirement of L-Tyrosine is approximately dependent on weight, 1000 mg per day for people that weigh 50kg, rising to 2000mg per day for people that weigh 100kg†
