Soylent, the meal-replacement startup, has recalled hundreds of boxes of its powder marketed as vegan and dairy-free due to a potential dairy contamination.

The recall, announced on the Food and Drug Administration's website on Monday, affects 890 boxes of its Soylent Powder 1.8 that was shipped to 610 customers.

Soylent says it issued a recall because the boxes "may contain undeclared milk." Soylent's 1.8 powder is advertised as dairy-free.

"People who have an allergy or severe sensitivity to milk run the risk of serious or life-threatening allergic reaction if they consume these products," Soylent said in a statement.

Soylent says that the recall is due to a "temporary breakdown" in its third-party manufacturer's production and packaging processes. Soylent says its manufacturer's milk-containing production lines were adjacent to the dairy-free Soylent 1.8 powder production line and there was "potential cross-contact."

Last year, Soylent recalled its newly launched Food Bar due to dozens of reports from customers suffering from vomiting and diarrhea. The company halted sales of its powder after the recall. A year earlier, Soylent had to delay shipments of Soylent 2.0 due to mold found in and on the bottles.