Nausea can be an adverse effect
NIH ODS lists nausea alongside diarrhea and abdominal cramps with high vitamin C intake. The timing of symptoms after a new supplement is worth recording, but does not establish the cause by itself. Other ingredients, medicines and illnesses can produce similar symptoms. [1]
An essential nutrient is not a universal anti-nausea medicine
Vitamin C supports collagen synthesis and normal immune function. Those functions do not demonstrate that extra vitamin C relieves nausea from pregnancy, infection, medicines or other causes. Increasing a dose in response to nausea can worsen a dose-related gastrointestinal problem. [1]
Review exposure rather than guessing a cure
Imagine a person starts a high-dose C product during an illness and feels more nauseated. Record the amount, timing and other products and obtain advice if symptoms persist or are severe. The adult 2,000 mg upper limit is not a target; lower amounts can still be poorly tolerated by an individual, and children have lower limits. [1]
| Hypothetical observation | Interpretation |
|---|---|
| Nausea after high-dose C | Possible adverse effect |
| Nausea during illness | Several possible causes |
| More C proposed as treatment | Benefit not established by nutrient function |
Sources for this article
- Vitamin C - Health Professional Fact Sheet
Source consulted: 2026-09-20. This is a reference resource, not a claim that we conducted the studies or tested a product.