Headache; abdominal cramps; diarrhea; nausea, vomiting. Ascorbic acid: Hemolysis (after large doses in patients w/ G6PD deficiency); delayed-type allergic response; insomnia, sleepiness; flushing; flatulent distention, gastric discomfort, heartburn, transient colic; increased urination (mild), kidney stone formation. Zn: Anemia, blood cell microcytosis, neutropenia; disturbance of Cu metabolism, loss of appetite, reduced Fe function; drowsiness; metallic taste; abdominal pain, dyspepsia, gastritis, GI discomfort/irritation. Colecalciferol: Hypercalcemia; cardiac arrhythmia; constipation; hypercalciuria, nephrolithiasis, nocturia, polyuria; polydipsia.