An individual who depends on absorption of vitamins formed by bacteria in the large intestine may become vitamin deficient if treated with antibiotics that inhibit other species of bacteria as well as the disease-causing bacteria.

People often use vitamins and minerals to supplement diet and treat disease.

Clinical trials in people are now under way, testing whether the vitamin or similar compounds can treat tumors or bolster chemotherapy.

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The Treatment Action Campaign (TAC) and the South African Medical Association (SAMA) took the Rath Foundation to court to prevent further unauthorized trials and to stop the foundation's claims that vitamins could treat or cure HIV/AIDS.

Can vitamin C help treat respiratory congestion?