Doctors Warn Supplements Above 1,000 mg Vitamin C Can Strain Kidneys

2 articles · Updated · RBC-Ukraine · May 28

High-dose vitamin C, vitamin D, some herbal products and protein supplements can add kidney stress or worsen existing disease, doctors said, with the biggest risks for people with kidney disease or a history of stones.
1,000–2,000 mg a day of vitamin C can raise oxalate levels that help form kidney stones, while vitamin D above the 4,000 IU adult upper limit can elevate blood calcium and also increase stone risk.
Aristolochic acid in some herbal supplements is linked to kidney failure and cancer, and St. John’s wort is often discouraged in chronic kidney disease because it can interfere with medications.
High-protein powders and bars are generally safe in appropriate amounts for healthy people, but in chronic kidney disease they may overload the kidneys, contribute to stones and speed disease progression.
Doctors advised getting nutrients from food when possible, limiting sodium, staying hydrated, choosing quality protein sources and monitoring blood pressure, glucose, creatinine and urine protein because kidney disease can progress silently.

Could your post-workout protein shake be overloading your kidneys and accelerating silent disease?

Your vitamins aren't FDA-approved for safety. What hidden dangers could be putting your kidneys at risk?