Too much Niacin

Intake of large niacin (Vitamin B3) doses can cause:

• Liver damage (75 mg or more)
  
• Peptic ulcers
  
• Flushing
• Gout
  
• Tingling skin
• Skin rashes
• Low blood pressure
• Diabetes-like symptoms
  
• Glucose tolerance (very large doses above 3 g/day)