L-Tyrosine, an amino acid, is a building block for several important mood enhancing brain chemicals (neurotransmitters) such as serotonin, dopamine and noradrenaline. L-Tyrosine is a precursor of thyroid hormones and it also assists in the function of the glands responsible for making and regulating hormones, including the adrenal, thyroid and pituitary glands. L-Tyrosine is therefore useful to improve thyroid function, for stress management, to increase low energy levels, for increased alertness, as an appetite suppressant, and to increase sexual desire.
Each capsule contains the following as active ingredient:
Store in a cool dry place, out of the reach of children.
L-Tyrosine is a non essential amino acid that the body synthesizes from L-phenylalanine. For people with phenylketonuria who cannot synthesize L-tyrosine from L-phenylalanine, L-tyrosine is an essential amino acid. Tyrosine is a precursor of thyroxine and melatonin. It is also a precursor in the synthesis of catecholamines, norepinephrine, epinephrine and dopamine. L-Tyrosine is classified as a large neuronal amino acid (LNAA) and competes with other LNAA’s, such as L-tryptophan, to get in the brain. It has been suggested that the brain cannot produce enough tyrosine from L-phenylalanine under stress. Cathecholamines like epinephrine, nor-epinephrine and dopamine that are synthesised from L-tyrosine can become depleted through stress. Increasing the availabililty of L-tyrosine in the brain during times of stress can reduce the damaging effects of stress. Studies have indicated that supplemental L-tyrosine may improve memory, performance and learning under stress.
Adults and children over 12 years of age: To enhance thyroid function: Take 2 capsules twice daily. For mood enhancing effects and for energy: Take 4 capsules twice daily. For improved sexual desire and increased mental alertness: Take 4-8 capsules twice daily. Children 7-12 years of age: Take half the adult dose. To ensure optimal absorption take on an empty stomach (30 minutes or more before meals). Because tyrosine can cause insomnia, the best times to take it are in the morning and the second dose not later than 4pm.
Do not exceed recommended dosages unless on the advice of a health care provider. Do not use this product if you are allergic to any of the ingredients. If you are on any medication or suffering from any medical condition, it is advisable to seek medical advice before starting any new medicine, supplement or remedy.
The following side effects have been reported: nausea, headache, heartburn and joint pain.
Hyperthyroidism, Graves Disease: L-Tyrosine might exacerbate these conditions and should be avoided in individuals suffering from these conditions. Melanoma and Glioblastoma multiforme: These tumours metabolise L-tyrosine as part of their growth. Schizophrenia: Individuals suffering from schizophrenia that have elevated dopamine levels should avoid taking tyrosine.
Levodopa: L-Tyrosine may decrease the effectiveness of L-Dopa, as they both compete for absorption in the proximal duodenum, doses of tyrosine and levodopa should be separated by 2 hours. Thyroid Hormone: L-Tyrosine may have additive effects with thyroid hormone medications as tyrosine is a precursor of thyroid hormone.
Pregnancy & Breastfeeding
Safety in pregnancy and breastfeeding has not been established, do not use.