Coconut water naturally contains potassium and magnesium. However, companies only need to list these on the nutrition information panel (NIP) if they make a health claim about it, like "high in potassium". 

All Healthier Choice Symbol (HCS) products must show certain core nutrients on the NIP. These are:  

• Energy 
• Protein 
• Total fat 
• Saturated fat 
• Cholesterol 
• Carbohydrates 
• Total sugar 
• Dietary fibre 
• Sodium 

Other nutrients are optional unless the company wants to highlight them with a health claim.