L-Tyrosine

Improves mental endurance and minimizes reaction time.

Jäger, R., Purpura, M., Olson, M., Hoffman, M., Beller, N., Gonzalez, A., et al. (2010). The Effects of Acute and Prolonged CRAM Supplementation on Reaction Time and Subjective Measures of Focus and Alertness in Healthy College Students. Journal of International Society of Sports Nutrition, 7, 39.

Increases motivation and happiness by catalyzing dopamine turnover.

Growdon, J. H., Melamed, E., Logue, M., Hefti, F., & Wurtman, R. J. (1982). Effects of Oral L-Tyrosine Administration Of CSF Tyrosine And Homovanillic Acid Levels In Patients. Life Sciences, 30(10), 827-832.

Supports fat loss.

Meijssen, S., Erkelens, D., Bilecen, S., Derksen, R., Ballieux, C., & Cabezas, M. (2001). Insulin Mediated Inhibition of Hormone Sensitive Lipase Activity In Vivo In Relation To Endogenous Catecholamines In Healthy Subjects. Journal of Clinical Endocrinology & metabolism, 86(9), 4193-4197.

Elevates mood while supporting memory and learning.

Deijen, J., & Orlebeke, J. (1994). Effect of Tyrosine on Cognitive Function And Blood Pressure Under Stress. Brain Research Bulletin, 33(3), 319-323; Grevet, E. H., Tietzmann, M. R., Shansis, F. M., Hastenpflug, C., Santana, L. C., Forster, L., et al. (2002). Behavioral Effects Of Acute Phenylalanine And Tyrosine Depletion In Healthy Male Volunteers. Journal of Psychopharmacology, 16(1), 51-55.