L-Tyrosine

L-Tyrosine is a nonessential amino acid that is a precursor to dopamine which counters stress-levels, which is good for hard training athletes as it reduces stress and fatigue. L-Tyrosine is found naturally in red meat, wheat, oats and fish. L-Tyrosine is also a precursor to the thyroid hormones thyroxine and triiodothyronine.

L-Tyrosine has two main effects - because it increases dopamine it is useful to combat fatigue and stress levels. L-Tyrosines main use in supplements is in fat loss supplements - this is because l-tyrosine affects thyroxin (thyroid hormones) this can have a beneficial effect on your base metabolic rate - meaning you can burn more calories all day long!

L-Tyrosine when taken on its own should be taken in dosages of no more than 1g at a time, and no more than 2g per day. That said l-tyrosine is mainly found in fat loss supplements, and in doses of up to 300mg per capsule as a rule (some companies have much less per capsule).

L Tyrosine side effects can include overstimulation, restlessness, anxiety, and insomnia. Heart palpitations or arrhythmias are potential side effects that occur from high doses of tyrosine. These can occur in sensitive individuals in as low a dose as 200 to 500 mg. For this reason do not take high dosages of l-tyrosine if you have a history of heart problems - and consult a doctor before starting any programme.