After several years of lethargy and sometimes moodiness, I was finally accurately diagnosed with low thyroid and placed on Synthroid.  Despite several more years of maintenance on Synthroid, I was still suffering from bouts of tiredness and occasional irritability.  I'd read a great deal over the years about various vitamins and had even tried a multi-vitamin from time to time, but I didn't get serious about trying to use specific vitamins to treat symptoms until last year.  After reading yet another in-depth article about various vitamins, I concentrated on C and E first, which were recommended...