Understanding Lab Tests for Hypervitaminosis C
Written by Private MD Labs Medical Writing Team • Last Updated: September 8, 2025
Hypervitaminosis C, also known as vitamin C toxicity, occurs when there are excessive levels of vitamin C (ascorbic acid) in the body, typically from overconsumption of dietary supplements. While vitamin C is water-soluble and generally considered safe, extremely high doses can lead to adverse health effects.
Recommended Test
Vitamin C
This test directly measures vitamin C levels in the blood to confirm hypervitaminosis C. Elevated levels can help explain symptoms such as diarrhea, nausea, stomach cramps, and other digestive issues. In cases of chronic overconsumption, monitoring vitamin C levels is important as extremely high levels may contribute to the formation of kidney stones.
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Diagnosing Hypervitaminosis C
Since symptoms of vitamin C toxicity such as digestive issues can overlap with other conditions, measuring actual vitamin C levels in the blood is essential for confirming the diagnosis. This testing helps healthcare providers determine if symptoms are indeed related to excessive vitamin C intake and guide appropriate treatment recommendations.
Understanding the Results
Normal vitamin C levels typically range from 0.4 to 2.0 mg/dL. Significantly elevated levels above the normal range, combined with symptoms and a history of high-dose supplement use, can confirm a diagnosis of hypervitaminosis C. Your healthcare provider will interpret your results in the context of your symptoms and supplement history.
Important Considerations
The information here is for educational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for diagnosis and treatment.
