I heard that it’s important to buy milk in opaque cartons because vitamins can leak with exposure to light.

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I searched your Web site for info on this topic, but couldn’t find any. I have heard before that it’s important to buy milk in opaque cartons because vitamins can “leak” with exposure to light. But now I would like to buy my milk in the new, recyclable glass bottles my grocery store is offering. Is this packaging story true or just a bunch of nonsense?
The vitamin in milk that is susceptible to light is riboflavin, vitamin B2. Yes, it is better to buy milk in opaque containers than clear glass. Remember to recycle the opaque containers.