| Im not sure about L-Tyrosine concentrations. I know one thing for sure, allthough Caffiene isn't really good for you in high doses, lately I have been able to use it with different results thanks to the L-Tyrosine. I am able to stay engaged in a book for hours at a time without looking at the clock. Learning new things also helps. I like to play the drums, but apparently, classical music is known for improving concentration and math skills, while rap and heavy metal deteriorate math skills and focus. |