Confusion, mood changes, seizures (seizures), fainting, fatigue, headache, mental changes, irritability. Too much vitamin C or zinc can cause nausea, diarrhea, and stomach cramps. Excess selenium can cause hair loss, gastrointestinal disorders, fatigue, and mild nerve damage. Vitamin A toxicity occurs when there is too much vitamin A in the body.
Symptoms may include nausea, vomiting, loss of appetite, abdominal pain, dizziness, irritability, drowsiness, headache, rash, increased intracranial pressure, coma, and even death. The maximum limit for adults is 3000 mcg per day.
