Vitamin deficiencies can be caused either by a lack of proper nutrition, known as a primary deficiency, or a underlying condition which leads to malabsorption, also known as a secondary deficiency. A wide range of disorders can arise as a result of a vitamin deficiency, so it is important to ensure that you are getting enough, particularly if you have been medically advised to so. The simple way to boost your vitamin intake is through supplements, and Weldricks provide a wide range at competitive prices.