What is the recommended daily allowance (RDA) of vitamin C for adults?

The recommended daily allowance (RDA) of vitamin C for adults is set at 90 mg per day for men and 75 mg per day for women, which makes the answer of 90 mg the most appropriate for adults in general. Vitamin C, also known as ascorbic acid, is essential for various bodily functions, including the synthesis of collagen, the absorption of iron, and the functioning of the immune system. Consuming adequate amounts of vitamin C can help prevent deficiencies, which can lead to conditions like scurvy.

The higher RDA reflects the recognition of vitamin C's importance in maintaining overall health, supporting healing, and acting as an antioxidant. Therefore, this level is a guideline to ensure most adults meet their physiological needs effectively.