Vitamin C excess Symptoms:
Although too much dietary vitamin C is unlikely to be harmful, megadoses of vitamin C supplements might cause:
Diarrhea.
Nausea.
Vomiting.
Heartburn.
Abdominal cramps.
Headache.
Insomnia.
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What happens if vitamin C is high?
However, supplementing with high amounts of vitamin C can lead to adverse effects, such as digestive distress and kidney stones. That's because if you overload your body with larger-than-normal doses of this vitamin, it will start to accumulate, potentially leading to overdose symptoms
Source: Mayo clinic
