Viridian High Twelve Vitamin B Complex may help people with anxiety or stress. High dosages of B12 may help to relieve the feeling of stress and instil a feeling of calm. The Vitamin B12 also plays an essential role in the body’s ability to replicate DNA, produce healthy red blood cells and energy production. This vitamin provides nutritional support to the functioning and development of the brain, nerves and blood cells. A deficiency of B12 can lead to the following symptoms: fatigue, muscle weakness, shortness of breath, dizziness, numbness, heart palpitations, bleeding gums and mouth sores, nausea and poor appetite.