Vitamin C is used for preventing and treating scurvy and increasing iron absorption from the gastrointestinal tract. It is also used for increasing the healing rate of wounds, burns, fractures, ulcers, and pressure sores. Vitamin C is used in preventing and treating the common cold and other viral infections, bronchitis, human immunodeficiency virus (HIV) disease, Helicobacter pylori infection, tuberculosis, dysentery, furunculosis, hematuria, retinal hemorrhages, hemorrhagic states, and anemia. Vitamin C is also used orally for atherosclerosis, preventing vascular thrombosis, myocardial infarction, stroke, hypertension, lowering cholesterol, glaucoma, cataracts, gallbladder disease, dental caries, pyorrhea, gum infections, constipation, peptic ulcer, acne, and dermatitis. It also is used for improving immune function, swine flu, allergic rhinitis (hay fever), asthma, bronchitis, cystic fibrosis, cystitis, prostatitis, infertility, and diabetes. It is also used orally for mental depression, cognitive impairment, dementia, Alzheimer’s disease, physical and mental stress, fatigue, attention deficit-hyperactivity disorder (ADHD), chronic fatigue syndrome (CFS), autism, collagen disorders, arthritis, bursitis, back pain, disc inflammation, cancer, osteogenesis imperfecta, osteoporosis, and gout. Other uses include improving physical endurance, treating Lyme disease, reducing aging, treating heat prostration, counteracting the side effects of cortisone and related drugs, aiding drug withdrawal in addiction, and in the treatment of levodopa, succinylcholine, interferon, aspirin, and arsenic toxicity. Other uses include use as an adjunct to radiation therapy and treating chronic radiation proctitis.