CNP Vitamin D 500 IU has been developed to support the immune system and maintain optimal health. Vitamin D is fat soluble and is best to take with salmon, nuts or an Omega-3 supplement. The vitamin helps reduce fatigue, increase hormonal transport, control blood glucose, reduce the risk of disease, regulate the body’s calcium and phosphorus levels, reduce the risk of some cancers and chronic pain, improve nutrient uptake in the intestine, strengthen muscle contractions, and reduce the incidence of depression.