How millions of cartons of ‘organic’ milk contain an oil brewed in industrial vats of algae

Inside a South Carolina factory, in industrial vats that stand five stories high, batches of algae are carefully tended, kept warm and fed corn syrup. There the algae, known as Schizochytriummultiply quickly. The payoff, which comes after processing, is a substance that resembles corn oil. It tastes faintly fishy.

Marketed as a nutritional enhancement, the oil is added to millions of cartons of organic milk from Horizon, one of the nation’s largest organic brands. Rich in Omega-3 fatty acids, the oil allows Horizon to advertise health benefits and charge a higher price.

“DHA Omega-3 Supports Brain Health,” according to the Horizon cartons sold in supermarkets around the United States.

What the Horizon milk carton doesn’t advertise is that some of its contents were brewed in closed stainless steel vats of Schizochytrium. This omission avoids any ick reaction from shoppers, but consumer advocates say it also dodges a  key question: Is milk supplemented with an oil brewed in a factory really “organic”?

“We do not think that [the oil] belongs in organic foods,” said Charlotte Vallaeys, a senior policy analyst, at Consumer Reports. “When an organic milk carton says it has higher levels of beneficial nutrients, like omega-3 fats, consumers want that to be the result of good farming practices … not from additives made in a factory.”

Exactly what should be considered an “organic” food? A closer look at how the oil winds up in organic milk offers insight into how the U.S. Department of Agriculture determines what foods may be sold with its coveted “USDA Organic” seal, a label that can double a product’s price. At least in part, it’s a lobbying tug-of-war: On one side, many companies, seeking to maximize sales, push the USDA for an expansive definition of “organic.” On the other, consumer groups advocate for a narrower, “purer,” definition.

In deciding to allow the use of the oil and similar additives, USDA officials, at least initially, misread federal regulations. In 2012, five years after the algal oil was introduced into milk, it quietly acknowledged that some federal regulations  had been “incorrectly interpreted.” The USDA then maintained the status quo — allowing the use of algal oil, among other things — in order not to “disrupt” the market.

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