Researchers at the Linus Pauling Institute at Oregon State University, a leading global authority on the role of vitamin C in optimum health, forward compelling evidence that the recommended dietary allowance (RDA) of vitamin C should be raised to 200 milligrams per day for U.S. adults, up from its current levels of 75 mg for women and 90 mg for men. The RDA of vitamin C is less than half of what it should be, scientists argue, because medical experts insist on evaluating this natural, but critical, nutrient in the same way they do for pharmaceutical drugs, and consequently reach faulty conclusions.

The researchers base their recommendations on studies showing that higher levels of vitamin C could help reduce chronic health problems including heart disease, stroke and cancer, as well as underlying causal issues such as high blood pressure, chronic inflammation, poor immune response and atherosclerosis. Even at the current low RDA, U.S. and Canadian studies have found that a quarter to a third of the total population is marginally deficient in vitamin C and up to a fifth of those in such groups as students, smokers and older adults are severely deficient in it.