Mag-D Immunity Support Complex provides a healthy dose of Magnesium, Vitamin C, Vitamin D3, plus Zinc, Copper, and Quercetin. These all combine to be a great supplement for overall immunity support as they each target and support bodily issues that can lead to diminished immune systems.  Stress, poor sleep, slow metabolism, and overall vitamin deficiencies weaken your body's protection against viruses and diseases. Almost 50% of all Americans suffer from Magnesium, Zinc, or Vitamin D3 deficiency. Magnesium - Plays a crucial role in the body, with supporting muscle and nerve function, plus energy production. Also supports brain health, and enhances serotonin levels while keeping cortisol low. Works against stress hormones, restless sleep, and inflammation. Zinc - Needed throughout your body! It is vital to your immune system and metabolism, but our body does not produce it. Some of the roles of Zinc in your body are in wound healing, protein synthesis, growth and development, and skin and nerve health. Vitamin D3 - The most important functions are aiding in the absorption of calcium and keeping normal immune system function. Getting a sufficient amount of Vitamin D is important for the normal growth and development of bones and teeth, as well as improved resistance against certain diseases. Quercetin - It’s one of the most abundant antioxidants in the diet and plays an important role in helping your body combat free radical damage. Also shown to support the body's fighting reaction to inflammation, allergy symptoms, and blood pressure.