Ascorbic acid, also known as Vitamin C, is a water-soluble vitamin found in citrus and other fruits and vegetables. Ascorbic acid has a sour taste and is less tolerable in people with sensitive digestive systems. If you have a sensitive digestion look at our buffered Sodium Ascorbate Powder or Capsules. Vitamin C contributes to: the normal function of the immune system the protection of cells from oxidative stress the reduction of tiredness and fatigue normal collagen formation for the normal function of skin, cartilage, gums, teeth, bones, blood vessel normal energy-yielding metabolism maintain the normal function of the immune system during and after intense physical exercise normal functioning of the nervous system normal psychological function the regeneration of the reduced form of vitamin E Vitamin C supplements can increase iron absorption