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Criteria and recommendations for vitamin C intake
1School of Nutrition Science and Policy and Scientist, Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, USA.
Nutrition Reviews
|August 24, 1999
Summary
New research suggests higher vitamin C intake is necessary, recommending 100-200 mg daily. This review also proposes a safe upper limit of 1 gram per day for optimal health.
Area of Science:
- Nutrition Science
- Human Physiology
Background:
- Current Recommended Dietary Allowance (RDA) for vitamin C is under review.
- Emerging evidence challenges existing vitamin C intake guidelines.
Purpose of the Study:
- To evaluate the experimental evidence for human vitamin C requirements.
- To propose updated intake levels for vitamin C.
Main Methods:
- Review of experimental data on vitamin C efficacy.
- Analysis of studies on human vitamin C metabolism and requirements.
Main Results:
- A daily intake of 100-200 mg of vitamin C is suggested as necessary.
- This proposed intake is two to threefold greater than the current RDA.
- A maximum daily intake of 1 gram of vitamin C is proposed.
Conclusions:
- Existing vitamin C recommendations may be insufficient.
- Higher vitamin C intake is potentially beneficial for human health.
- Further research is warranted to confirm optimal vitamin C levels.