Look for the expiration date on the packaging of Riboflavin Sodium Phosphate.
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NutriBuddy™ 
Description
Riboflavin Sodium Phosphate is water-soluble, essential micronutrient which is the phosphate sodium salt form of riboflavin. It is basically a subclass of riboflavin in the form of yellow to orange crystalline hygroscopic powder, with slight odour.