Vitamin C: Oral Dosing


Vitamin C: Achieving Maximum Oral Dosing




Vitamin C in high, very frequent oral doses will achieve blood plasma concentrations approaching, but not as high as, intravenous infusion.


By “high,” I mean in the range of 30,000 to 100,000 milligrams per day, and 500-2,000 milligrams per dose.


By “very frequent,” I mean taking 500-2,000 mg every ten minutes you are awake.


How do you know if you took enough? You feel better.


How do you know if you took too much? You will have loose stools. At that point, of course, you back off and take less.


How much less? Enough to still feel better, and not so much as causes loose stools.


If you do not think this will work, it is probably because you have not tried it.


Or, perhaps because you need to read the following especially important and helpful material:


Cathcart RF. Vitamin C, titrating to bowel tolerance, anascorbemia, and acute induced scurvy. Med Hypotheses. 1981 Nov;7(11):1359-76. Free access to full text paper at  


Cathcart RF. The third face of vitamin C. Journal of Orthomolecular Medicine, 7:4;197-200, 1993. Free access to full text paper at  


Other papers by Dr. Cathcart are posted at .


Hickey S and Roberts H. Ascorbate: The science of vitamin C. 2004. Lulu Press. ISBN 1-4116-0724-4. Reviewed at


Duconge J et al. Pharmacokinetics of vitamin C: insights into the oral and intravenous administration of ascorbate. PR Health Sciences Journal, 2008. 27:1, March.


Andrew Saul is the author of the books FIRE YOUR DOCTOR! How to be Independently Healthy (reader reviews at ) and DOCTOR YOURSELF: Natural Healing that Works. (reviewed at )


Andrew W. Saul


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