Increasing your intake of Vitamin B-12 is beneficial to the health of your entire nervous system, and is effective for general tiredness and well being even if you aren't B-12 deficient.
Intensive Nutrition's supplement is a sublingual formula, derived from hydroxycobalamin, superior in bioavailability to cyanocobalamin. It has been complexed with beta-cyclodextrin to increase further oral bioavailability and maximum absorption.
General tiredness is an accepted state of being in today's society. BE DIFFERENT!