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This is Scientific American 60-Second Science. I'm Dina Fine Maron. Got a minute?

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A small but growing market exists on the internet for human breast milk.

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Now a study finds that buyers should really beware,

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some purveyors of breast milk appear to be adulterating their product with cow's milk.

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Such bovine contamination is more than just a scam:

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it can be a health risk for infants who are allergic to or intolerant of cow's milk.

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The study, the first to document this milk fraud, is in the journal Pediatrics.

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Researchers purchased 102 samples of supposed human breast milk online.

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Tests found that ten of these samples had enough bovine DNA to indicate that at least 10% of the milk in the sample actually came from cows.

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Human milk is an ideal source of nutrients for infants, when it's safe.

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Prior studies on breast milk purchased online have revealed dangerous amounts of bacterial growth that make it unsuitable for infant consumption.

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Since no one typically screens these internet-sold milk products for pathogens or other contamination it's up to consumers to protect themselves.

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Some human milk banks do voluntarily screen their products.

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So it's best to check with local departments of health to find safe products.

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Thanks for the minute, for Scientific American's 60-Second Science. I'm Dina Fine Maron.

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