Key Takeaways

High doses of vitamin C, especially above the tolerable upper limit of 2,000 mg per day, can lead to serious side effects such as kidney stones, gastrointestinal issues, and complications in people with certain medical conditions.

Most people can meet their vitamin C needs through a balanced diet.

Vitamin C supplements may be beneficial in certain situations, but they should be used with caution and under the guidance of a healthcare professional.

Vitamin C supplements are safe for most people, but excessive use or megadosing can lead to several adverse effects. While rare, serious side effects of vitamin C can occur, particularly when taken in large quantities over an extended period.

1. Kidney Stones

High doses of vitamin C can increase oxalate levels in the urine.

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