Certified Specialist In Renal Nutrition (CSR) Practice Exam 2026 - Free CSR Practice Questions and Study Guide

The recommended Dietary Reference Intake (DRI) of Vitamin C for men is established based on the need to prevent deficiency and support overall health. For adult men, the DRI is set at 90 mg per day. This is the amount needed to meet the nutritional requirements of most men and to promote optimal health through its roles in immune function, antioxidant activity, and collagen synthesis.

In considering individuals who may be at risk of deficiency due to factors like inadequate dietary intake, increased physiological needs, or certain health conditions, the recommendation remains at 90 mg/d. This level is deemed sufficient to not only prevent deficiency but also to support overall metabolic processes and health-related functions.

The other options reflect lower intakes that may not adequately address the needs of individuals, especially those at risk. A daily intake of 75 mg might be adequate for some populations but does not provide the same level of assurance for those needing additional support through Vitamin C. Similarly, 50 mg is clearly lower than the established requirement, and while 100 mg exceeds the DRI, it does not align with the standard recommendations as the minimum necessary intake to ensure adequate health outcomes. Therefore, 90 mg/d is the most appropriate recommendation for men at risk of Vitamin C deficiency