Vitamin C Foundation's Recomended Daily Allowance (RDA)

RDA: 3000 mg Vitamin C

Vitamin C is defined as the substance the cures the deficiency disease scurvy. This separates ascorbate (e.g., vitamin C as ascorbic acid or sodium ascorbate, etc.) from the unscientific "natural vitamin C complex" which can be defined to exist. However, any such complex minus ascorbic acid does not and cannot cure scurvy, and therefore, cannot be "Vitamin C."

The Vitamin C Foundation recommends that every man, woman and child over the age of 3 consume at least 3 g (3000 mg) vitamin C daily in order to enjoy optimum health.

More during pregnancy (6000 mg), and much more during periods of disease (20,000 to 300,000 mg).

RDI Source/Population
60-95 mg U.S. Recommended Intake
200 mg Levin/NIH Recommendation
400 mg (recently increased) Current Linus Pauling Institute Recommendation
2500 mg Hickey/Roberts minimum
3000 mg Foundation's daily recommendation
6000-12000 mg Levy's daily recommendation
6000-18000 mg Pauling's daily recommendation
6000-9000 mg Pregnancy
6000-18000 mg Heart Disease
14000-30000 mg Cancer
20000-300000 mg Cathcart/Levy Cure for Infectious Diseases


Our recommendation is more than 30 times what the United States Government's National Academy of Sciences recommends (75-90 mg), and 15 times more than what the Linus Pauling Institute and the Levin group at the National Institutes of Health recommend (200 mg).

Linus Pauling recommended 2 to 6 times the Foundation's vitamin C RDA (6000 to 18,000 mg vitamin C). Pauling wrote that his recommendation was based on the large amounts of vitamin C animals make for themselves, and on the amount humans must ingest orally to achieve similar levels.

Vitamin C author/expert Thomas E. Levy, MD, JD, recommends from 2 to 4 times our recommendation (6,000 to 12,000 mg daily)

Our recommendations are partly based on the work of Dr. Robert Cathcart, III. Cathcart determined that the ability to tolerate oral intakes of the vitamin vary between 4 and 16 g daily during ordinary poor health. Cathcart's clinical experience demonstrates that virtually every human being will tolerate 4 g vitamin C daily.

The Foundation recommends 1 g vitamin C for children based on their age, up to the age of 3. One gram for one-year-olds, two grams for two-year-olds, etc.

Our recommended daily allowance may not prevent or resolve diseases related to lack of vitamin C. For example, we believe that heart disease requires from 6000 to 18,000 mg vitamin C, and that cancer may require 14,000 to 30,000 mg daily.

We do realize that if our recommendation were adopted by most people in the world, there would be a grave shortage of the vitamin. (Perhaps this is one reason that Government recommendations are so tiny?)

Owen R. Fonorow

Vitamin C Dosage in Disease Cathcart's Bowel Tolerance paper in PDF suitable for printing.

Hickey/Roberts Ridiculous Dietary Allowance

Foundation's Comments on Recent RDA Changes

Bill Sardi's Comments on RDA

"The authors of the RIDICULOUS DIETARY ALLOWANCE therefore assert that the Governmental RDA and the Codex justification for low intakes of vitamin C are both invalid and indefensible." - 2005 - Steve Hickey/Hilary Roberts

Vitamin C Foundation


In Stock! Foundation-Approved Pauling Therapy Drink Mix "My father loved the taste of Cardio-C." -TOMMY O. (Sweden)