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Key Takeaways Regular, 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.—Sarah Jividen, Verywell Health, 25 Feb. 2026 An overdose of vitamin C can cause kidney stones and other infections.—Bestreviews, Chicago Tribune, 17 Feb. 2026 While protein is an essential part of the diet, experts say people with high protein diets have a higher risk of kidney stones.—Swapna Venugopal Ramaswamy, USA Today, 7 Feb. 2026 Even vitamin D in excess amounts can lead to unpleasant symptoms like nausea and vomiting and even kidney stones in the long run, explains Dr. Klodas.—Mara Santilli, Flow Space, 5 Feb. 2026 See All Example Sentences for kidney stone