Eleutherococcus also helps to restore memory and concentration. DL-Phenylalanine promotes mental alertness, elevates mood, and enhances concentration. DL-Phenylalanine also has natural pain relieving and depression alleviating properties. Additional studies have also shown Phenylalanine's ability to decrease chronic back pain and pain associated with migraines and menstruation. L-Tyrosine is synthesized from Phenylalanine in the body.
Dopamine is vital to mental function and also seems to play a role in sex drive.
U.S. soldiers undergoing various forms of stress tests were given tyrosine to see what effect it might have on their performance. The soldiers who took tyrosine performed significantly better in a variety of tests compared to those who took a placebo. They were more efficient, alert, and had fewer complaints. Clinical studies have also shown that tyrosine is helpful in reducing headache, irritability, anxiety, fatigue, muscular discomfort, sleepiness, and depression. Vitamin B-6 is an important nutrient that supports more vital bodily functions than any other vitamin.