- With B-Complex and Vitamin C.Cal-Mag Stress Formula is a mix of Calcium, Magnesium, Vitamin C, and a full range of B-vitamins which aid in the production of energy. Vitamin C, in addition to its function as an antioxidant, helps to support a normal adrenal response. This product also provides the daily recommended levels of Calcium and Magnesium, both of which are necessary for skeletal health. All together NOW Cal-Mag Stress Formula has essential minerals and nutrients required for optimal daily functioning.