While vitamin C is generally safe, excessive intake can lead to adverse effects such as gastrointestinal discomfort, diarrhea, nausea, and abdominal cramps. The tolerable upper intake levels (UL) for children are:
- Children (1-3 years): 400 mg/day - Children (4-8 years): 650 mg/day - Children (9-13 years): 1200 mg/day - Adolescents (14-18 years): 1800 mg/day
Exceeding these levels, especially through supplements, should be avoided.
