Vitamin C (Ascorbic Acid)
Vitamin C, or ascorbic acid, is an antioxidant nutrient your body uses to make collagen, absorb iron, and support immune function. This test measures the amount in your blood.
Vitamin C supports healthy skin, blood vessels, and wound healing, and helps your body absorb iron from plant foods. Your body does not store much of it, so a steady dietary supply matters. Levels can fall with limited fruit and vegetable intake, smoking, or certain conditions.
A high vitamin C level usually reflects recent intake or supplementation and is generally not harmful, because your body excretes excess water-soluble vitamin C in urine. Very high supplement doses can occasionally cause digestive upset or, in susceptible people, contribute to kidney stones. On its own a high value is rarely concerning.
A low vitamin C level suggests your intake has been insufficient, which over time can affect gums, skin, and wound healing. It often reflects a diet low in fruits and vegetables.
Most labs report a normal range, and low values usually prompt a look at your diet. A clinician can help you interpret your result.
Sources
Educational context only, not medical advice or a diagnosis. Reference ranges vary by lab, age and sex; always discuss your results with a clinician.