L-Tyrosine

L-Tyrosine is a Amino Acid supplement available in 1 form.

Not all forms of L-Tyrosine are equal. The form you choose determines how much L-Tyrosine actually reaches your tissues, and the difference between the best and worst forms can be substantial. L-tyrosine is the conditionally essential amino acid that serves as the direct precursor to the catecholamine neurotransmitters dopamine, norepinephrine, and epinephrine, as well as thyroid hormones. Research supports L-tyrosine for promoting healthy cognitive function, stress response, and focus—particularly during cognitively demanding situations.

L-Tyrosine Preferred (Preferred Form) has a bioavailability rating of good absorption.

L-Tyrosine is a conditionally essential amino acid and the direct precursor to dopamine, norepinephrine, epinephrine, and thyroid hormones (T3/T4). Research demonstrates cognitive performance benefits under stress, sleep deprivation, and multitasking conditions — scenarios that deplete catecholamine reserves. Military and aerospace research supports its use for maintaining cognitive function during demanding situations.

Plasma tyrosine measured at multiple timepoints post-dose; dose-dependent plasma rise documented across three dose levels in healthy adults PMID: 29168741

L-tyrosine may support mental flexibility when switching between demanding tasks. In a double-blind placebo-controlled crossover trial of 22 healthy adults, oral tyrosine reduced task-switching costs versus placebo. PMID: 25598314

L-tyrosine may support the ability to hold back an unwanted response under pressure. In a double-blind placebo-controlled trial in healthy adults, oral tyrosine improved inhibitory control but did not change response execution speed. PMID: 24433977

L-Tyrosine is classified as Preferred Form by FormulaForge — our top recommendation for L-Tyrosine. It carries a bioavailability rating of good absorption, meaning more of the active compound reaches your tissues per dose unit compared to lower-rated forms.

When choosing a L-Tyrosine supplement, read the label for the specific form name — that is what determines how much you actually absorb. Preferred Forms have the strongest research-backed evidence for efficient absorption.

Other forms may be appropriate depending on individual goals, cost considerations, and your healthcare provider’s guidance. The best form for you depends on your specific health needs.

Individual dose requirements vary based on health goals, body weight, and existing nutrient intake. Your healthcare provider can help you determine an appropriate amount of L-Tyrosine for you.

Side Effects: Consult your healthcare provider regarding tolerability, particularly at higher doses.

These statements are based on structure/function research and have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before starting or changing a supplement regimen.

The following studies and findings inform FormulaForge classifications for L-Tyrosine:

Plasma tyrosine measured at multiple timepoints post-dose; dose-dependent plasma rise documented across three dose levels in healthy adults PMID: 29168741

L-tyrosine may support mental flexibility when switching between demanding tasks. In a double-blind placebo-controlled crossover trial of 22 healthy adults, oral tyrosine reduced task-switching costs versus placebo. PMID: 25598314

L-tyrosine may support the ability to hold back an unwanted response under pressure. In a double-blind placebo-controlled trial in healthy adults, oral tyrosine improved inhibitory control but did not change response execution speed. PMID: 24433977