21st Century Stress B with Zinc is a multivitamin formula designed to replace key nutrients that support the immune system and effects of stress. Studies have shown that during periods of unusual physical stress, your body uses up more vitamins than normal. Taking 21st Century Stress B will benefit your health if you do not get enough B vitamins from other sources. B vitamins play a vital role in releasing energy from carbohydrates, fats, and proteins. B vitamins also help to maintain a healthy nervous system that allows the body to effectively fight the symptoms of stress. B vitamins act as cofactors in the synthesis and regulation of dopaminergic and serotonergic neurotransmitters. Both of these neurotransmitters are implicated in the regulation of mood, as well as clinical depression. B Vitamins support a healthy immune system by supporting cell health, red blood cells, energy levels and cardiovascular health, among other functions. Zinc is an essential trace element that plays an important role in many physiological functions. One of the key functions of zinc is its influence on the immune system. Zinc is required for the development and functioning of immune cells in the innate and the adaptive immune system. Zinc also plays a significant role with respect to the stress response. It help to stabilize serum cortisol (the primary stress hormone) levels over time.