fb61bd32_Taking_Nutritional_Supplements__Reasons_for_Caution
[Clinical Problem] Diarrhoea [Potentially Harmful Nutrient] Magnesium usually >150 mg Iron usually >17 mg/day Vitamin C >1000 mg/day. Chewable supplements containing sorbitol or xylitol [Reasons for Caution] 
Supplements of these three nutrients can cause or aggravate diarrhoea especially at high dose. The artificial sweeteners sorbitol and xylitol can sometimes cause diarrhoea.
Minor Contraindications to Taking Nutritional Supplements
Reasons for Caution