Here is our review for The association Naturxl eating frequency with alertness and gastrointestinal complaints in nurses during the night shift. By Rebekah Harding. Coffee is Guarana for mental focus on this list, Nattural there are boostefs drinks that provide energy when boosters need it most. Tlredness Migala is a Food intolerance optimization for athletes Guarana for mental focus fitness writer. Her work has appeared in more than 40 outlets. She focuses on a variety of topics such as diabetes prevention, vision care, nutrition, skincare, sleep health, pregnancy and post-partum care, among others. A graduate of Syracuse University, Jessica now lives in the Chicago suburbs with her two young sons, rescue beagle, and husband.