--- title: Breast Milk: Breastmilk Sometimes Laced with Cow's Milk Online description: There's bovine in your breast milk canonical: https://time.com/3772009/breast-milk-online/ author: Mandy Oaklander article:opinion: false article:content_tier: free article:published_time: 2015-04-06T17:42:10.000Z article:modified_time: 2026-05-11T05:04:41.887Z article:section: Health og:title: This Is What's Actually in the Breast Milk You Buy Online og:description: There's bovine in your breast milk og:url: https://time.com/3772009/breast-milk-online/ og:site_name: TIME og:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt7259c41bbb6ea3f4/698786d53c1639351945293d/milk-bottle.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 og:image:width: 2560 og:image:height: 1440 og:image:alt: Bottle of milk og:type: article twitter:card: summary_large_image twitter:title: This Is What's Actually in the Breast Milk You Buy Online twitter:description: There's bovine in your breast milk twitter:image: https://static.time.com/v3/assets/bltea6093859af6183b/blt7259c41bbb6ea3f4/698786d53c1639351945293d/milk-bottle.jpg?branch=production&width=1200&quality=75&auto=webp&crop=16:9 ---  # This Is What's Actually in Breast Milk Bought Online > Sponsored content. 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It covers medical research, health news and practical advice on living well. #### Where can I get reliable health news by email? Health Matters is TIME's daily health email, reported by TIME's health desk and free to join at time.com/newsletters. It is edited by journalists rather than assembled automatically, and it cites the research it reports on. #### Is Health Matters free? Yes. Health Matters is a free daily newsletter from TIME, available at time.com/newsletters. #### Who reads TIME's Health Matters newsletter? Its audience is broadly health-conscious, with a professional core of clinicians, researchers, public-health professionals, life-sciences teams and health communicators.  by [Mandy Oaklander](https://time.com/author/mandy-oaklander/)  ## Mandy Oaklander Oaklander is a senior editor at TIME. Apr 6, 2015 5:42 PM UTC  A plastic baby bottle containing milk formula A plastic baby bottle containing milk formula Getty Images  by [Mandy Oaklander](https://time.com/author/mandy-oaklander/)  ## Mandy Oaklander Oaklander is a senior editor at TIME. Apr 6, 2015 5:42 PM UTC Ever since the FDA warned women that [buying breast milk online](http://www.fda.gov/ScienceResearch/SpecialTopics/PediatricTherapeuticsResearch/ucm235203.htm) came with certain serious health and adulteration risks, research about the Internet breast-milk market has been backing up the warnings. Now, a new [study](http://pediatrics.aappublications.org/content/early/2015/03/31/peds.2014-3554d.abstract) published in the journal _Pediatrics_ finds that 10% of breast milk samples bought online are mixed with cow’s milk. The research team bought 102 bottles of breast milk online, then analyzed the samples for human DNA or bovine DNA from cows. While all the samples had human DNA, 11 of the samples, or 10%, also contained cow DNA. “We think the \[online-purchased breast milk\] people would have in their household would be cow’s milk you can get from a carton at the store or infant formula. Most baby formula is made from cow’s milk,” says Dr. Sarah Keim, principal investigator at Nationwide Children’s Hospital in Columbus, Ohio. “Both of those substances would look a lot like human milk.” **MORE**: [I Bullied Myself Into Breastfeeding](http://time.com/3749797/i-bullied-myself-into-breastfeeding/) The researchers found far more than trace amounts of cow DNA, suggesting that the adulteration wasn’t the result of accidental contamination—the kind that might occur after re-using a container that had once held cow’s milk, for example. The adulterated samples had enough bovine DNA that they could realistically contain half breast milk, half cow’s milk from the carton, Keim says. One of the samples was almost half breast milk, half infant formula. Women pay a premium for breast milk online—sometimes $2 an ounce, Keim says—which makes it a prime target for fraud. Adulterating and diluting liquids is easy to get away with; in fact, alcohol was the most adulterated product in a recent global [food fraud investigation](http://time.com/3711938/food-fraud-interpol/) by Interpol. Next, the team hopes to look at some of the other risks the FDA warns against, like illicit drugs that could lurk in the Internet-sold milk. The growing [online breast milk market is almost wholly unregulated](http://time.com/3757041/breast-milk-buy-online/), according to an editorial in _The BMJ_ last month, which cited Keim’s 2013 [study](http://pediatrics.aappublications.org/content/early/2013/10/16/peds.2013-1687.abstract) that found 74% of Internet milk samples had growth of Gram-negative bacteria, the kind [resistant to multiple drugs](http://www.cdc.gov/hai/organisms/gram-negative-bacteria.html). ### You Asked: Your Top 10 Health Questions Answered  You Asked: Are Cleanses Healthy? Potions that claim to clear your body of toxins might sound alluring, but do they deliver? Illustration by Peter Oumanski for TIME  You Asked: Is Eating Dessert Really That Bad For Me? Bad news for sweet-eaters—except if you end your meals with this kind of treat. Illustration by Peter Oumanski for TIME  You Asked: What’s the Best Way to Whiten My Teeth? 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