fb61bd32_Taking_Nutritional_Supplements__Reasons_for_Caution
[Clinical Problem] Gastritis or Active Peptic Ulcer [Potentially Harmful Nutrient] Zinc Copper Potassium Vitamin C [Reasons for Caution] 
All of these supplements can sometimes cause gastro-intestinal irritation. The risk is reduced if they are taken after food.
Minor Contraindications to Taking Nutritional Supplements
Reasons for Caution