Vitamin Deficiency Symptoms: If you feel tired throughout the day, experience constant fatigue, or feel exhausted even without much work, do not ignore it. This could be a sign of body weakness and low energy. Often, the reason behind this is vitamin B deficiency or vitamin B complex deficiency. In this video, we explain the causes of fatigue, the symptoms of vitamin B deficiency, the benefits of vitamin B, and the symptoms of vitamin B12 deficiency. We also discuss ways to reduce fatigue and weakness and how to overcome vitamin deficiency. This health news will help you take the right steps at the right time.