The National Institutes of Health's Office of Dietary Supplements states that the recommended daily amount of Vitamin C for an adult male is 90 mg. The highest recommended dose is 120 mg for breastfeeding women. The upper limit does of Vitamin C for adults is 2,000 mg.
The book "Prescription for Natural Healing" (5th ed.), however, recommends an optimum daily intake of 1,000 to 3,000 mg of "Vitamin C with mineral ascorbates (Ester-C)". I don't have much experience with the book and I'm trying to gauge how helpful it is.
Am I right to see a conflict here? Or are they talking about different things? Is this really as simple as the book making a wildly bad recommendation, or is there reason to think a higher dose is good?