What is the Appearance of Vitamin B2?
                                
                                
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                                    4 min read                                
                            
                                Over 50% of the riboflavin in milk can be destroyed after just two hours of exposure to bright sunlight, which is why milk is sold in opaque cartons. This light sensitivity is also why the pure form of vitamin B2, or riboflavin, has a distinctive appearance that is highly visible and naturally fluorescent.