Initial visit/baseline measures for intervention and control groups (1-2 hrs): Subject Info and Demographics, Fatigue Severity Scale (FSS), Blood draw (vitamin B-1 (thiamine), vitamin B-9 (folate), vitamin B-12 (cobalamin), vitamin K, homocysteine, C-reactive protein), MS Functional Composite (MSFC) [Timed 25-Foot Walk (T25-FW), 9-Hole Peg Test (9-HPT), Paced Auditory Serial Addition Test (PASAT)], 6-minute walk, and Paced Visual Serial Addition Test (PVSAT).