Other names L-Tyrosine, N-Acetyl L-Tyrosine
The legality and side effects of Tyrosine
You should always consider the risks of a nootropic before you use it.
Supplements and drugs can interact with Tyrosine to increase or decrease the positive or negative effects you experience. If you are already using any supplements or drugs, speak with your trusted medical professional before you experiment with Tyrosine. To learn more about the potential interactions between Tyrosine and other substances, use interaction-checker.
Is your country not included? Learn how to find out if Tyrosine is legal in your country.
The contents herein are not legal advice or a substitute for legal counsel. information is not intended to create, and receipt of it does not constitute, an attorney-client relationship. While we have done our best to be as accurate as possible in the information we convey to you about the legality of nootropics, there is a risk for inaccuracies and errors. If you’re uncertain about the legality of any of your actions, contact a legal counsel or your local authorities governing the legality of various substances you may want to use/import/travel with.
Frequently asked questions about Tyrosine
Which foods are rich in tyrosine?
The top 10 foods highest in tyrosine are :
- Beef (1279mg tyrosine/100g beef)
- Lean pork chops (1228mg/100g)
- Salmon (1207mg/100g)
- Chicken breast (1155mg/100g)
- Squash and Pumpkin Seeds (1079mg/100g)
- Tofu (701mg/100g)
- Ricotta Cheese (596mg/100g)
- White Beans (274mg/100g)
- Milk (170mg/100g)
- Rice (169mg/100g)
Studies conducted on the effects of Tyrosine in healthy humans
No placebo-controlled trials on healthy humans that meet our inclusion criteria have been conducted on Tyrosine.
"In conclusion, we show age-related effects of tyrosine administration especially on proactive, not reactive, response inhibition."
L-Tyrosine had a very big positive effect on memory in healthy adults
"We conclude that all drugs tested improved at least some aspects of cognitive and motor performance after sleep deprivation."
This indicates a pattern of results whereby low-performing subjects improved, whereas high-performing subjects were impaired on L-tyrosine.
"Results showed that tyrosine abolished fear expression compared to placebo."
"Significantly, the detrimental effects of tyrosine on cognitive flexibility driven by the high cognitive load manipulation was specific, as tyrosine did not alter performance of the simple reaction time task (low cognitive load) or the forward digit span memory task (high cognitive load)."
"These findings suggest that lower or insufficient supply of tyrosine might result in dysfunctional connectivity between striatal and frontal regions leading to lower WM capacity in healthy elderly humans."
"Taken together, our data suggest that beneficial effects of tyrosine supplementation do not require depletion effects, but may be limited to situations where we consciously perceive a conflict and the associated need for conflict-specific control."
"The results show that acute tyrosine supplementation is associated with increased endurance capacity in the heat in moderately trained subjects."
"As expected, in the Tyrosine condition participants were more efficient in inhibiting unwanted action tendencies than in the Placebo condition while response execution was unaffected."
"Tyrosine was found to improve the performance on two cognitive tasks, which were performed 1 h after administration of the medication and which could be characterized as highly sensitive to stress."
"The results indicate that acute ingestion of tyrosine by healthy men has no measurable effect on endurance, muscle strength, or anaerobic power."
"10 randomized controlled trials and 4 controlled clinical trials met our inclusion criteria. On the basis of the available evidence, no recommendation could be made for the effect of tyrosine on physical performance under stressful physical conditions. However, a weak recommendation in favor of tyrosine was made for cognitive stress as all studies showed a positive effect."
"Compared to a neutral placebo, TYR promoted cognitive flexibility (i.e. reduced switching costs). This finding supports the idea that TYR can facilitate cognitive flexibility by repleting cognitive resources."
"Tyrosine did not alter most subjective or physiological responses to severe acute stress, but it increased ratings of anger. The modest increase in anger may be an adaptive emotional response in stressful environments."
"... TYR is an effective enhancer of cognition, but only when neurotransmitter function is intact and DA and/or NE is temporarily depleted."
"There is evidence that tyrosine may benefit healthy individuals exposed to demanding situational conditions."
Last updated Saturday, June 10, 2023