Your morning breakfast cereal may not be as healthy as you once thought. A recent study conducted by The Environmental Working Group (EWG) found unsafe amounts of the herbicide glyphosate in a number of popular breakfast cereals and snacks including Cheerios and Quaker Oats.

The study tested 29 different grain-based products, with all but five testing positive for glyphosate. Glyphosate is the main ingredient in weed killers such as Roundup and has been linked to cancer.

The news comes one week after chemical giant Monsanto was ordered by a court to pay $289 million to a terminal cancer patient whose illness could be attributed to using its Roundup weed killer. According to USA Today, hundreds of similar cases have been filed against Monsanto and are currently working their way through the court system.

Products With Potentially Dangerous Levels of Glyphosate

• Back to Nature Classic Granola
• Quaker Simply Granola Oats (Honey, Raisin and Almonds)
• Nature Valley Granola Protein (Oats ‘n Honey)
• Giant Instant Oatmeal Original Flavor
• Quaker Dinosaur Eggs Instant Oatmeal
• Great Value Original Instant Oatmeal
• Umpqua Oats – Maple Pecan Flavored
• Market Pantry Instant Oatmeal
• Cheerios Toasted Whole Grain Oat Cereal
• Lucky Charms (without marshmallows)
• Barbara’s Multigrain Spoonfuls Cereal
• Kellogg’s Cracklin’ Oat Bran Cereal
• Nature Valley Crunchy Granola Bars (Oats ‘n Honey)
• Quaker Steel Cut Oats
• Quaker Old Fashioned Oats
• Bob’s Red Mill Steel Cut Oats