Frozen berries may add more than vitamins and minerals to your smoothie. They can also carry bacteria and viruses from hands, work surfaces, or the water they were washed in. Freezing doesn’t kill bacteria, so experts recommend you boil imported frozen berries for a minute or two before you use them. Don’t know where your frozen berries are from? Assume they’re imported if you don’t see a country of origin on the label.

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