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Coal tar - Tartrazine is a dye derived from coal tar and is known as yellow #5 on ingredients lists.

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Coal tar - The industrial waste-derived additive is linked to hyperactivity in children and cancer.

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Coal tar - Foods that contain yellow #5/tartrazine include Kraft Macaroni and Cheese, various candy products, Mountain Dew, and orange-colored snacks, among countless others.

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Carrageenan - This ingredient, typically found in dairy products, is derived from red seaweeds and is used as a thickener.

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Carrageenan - Some of its side affects include inflammatory bowel disease, rheumatoid arthritis, and arteriosclerosis.

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Carrageenan - The ingredient can be found in deli meats, juices, and most dairy products.

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Beaver anal glands - Castoreum, a food additive derived from the anal glands of beavers, is commonly labeled as a "natural ingredient."

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Beaver anal glands - The secretions are used in various flavorings and perfumes.

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Beaver anal glands - It is a popular substitute for vanilla flavoring and can also be found in raspberry and strawberry-flavored products.

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Hydrolyzed protein - Hydrolyzed protein is a protein that has been broken down into its amino acid components, or pre-digested.

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Hydrolyzed protein - The powder is soaked in a substance that mimics stomach acid, which is supposed to make it easier for you to digest. The synthetic process also allows manufacturers to sneak in other additives, such as MSG.

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Hydrolyzed protein - It is found in workout proteins and other products, such as Funyuns (an onion-flavored corn snack).

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Rodent hair - A certain amount of rodent hair is permitted in food.

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Rodent hair - You may find this on a nutrition label written as "natural contaminant."

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Rodent hair - Rodent hair is commonly found in peanut butter products.

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Borax - This additive, referred to as E285, is known for its preservative and acidity control properties.

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Borax - Although typically used in household products, such as laundry detergent, and as a fire retardant, it can also be found in food. Overconsumption of the substance may be linked to cancer. (Photo: Flickr/CC BY 2.0)

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Borax - Watch out for Asian noodles, rice dishes, and caviar.

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Arsenic - Scientists have found traces of arsenic in various foods. Not only does it cause many adverse health effects, it is also a carcinogen.

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Arsenic - Beer and wines are often culprits for containing arsenic due to the way they are filtered.

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Arsenic - Brewers use diatomaceous earth as a filter, which is a substance high in iron and metals. Arsenic has also been found in rice and cereal.

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Sheep secretions - A secretion sourced from the wool of sheep, known as lanolin, is popularly used in products for babies and breast-feeding moms.

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Sheep secretions - The thick, oily secretion is also a common component of gum and will show up on the label as "gum base."

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Sheep secretions - You will also ingest lanolin if you take vitamin D3 supplements.

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Human hair - L-cysteine is an ingredient found in many commercial bread products, and is often harvested in China from human hair.

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Human hair - The amino acid extends the shelf life of many bread products and can also be found in cow horns and chicken and duck feathers.

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Goat stomach - Rennet is an enzyme derived from the stomachs of goats, calves, and lambs.

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Goat stomach - The enzyme helps newborn animals digest and absorb milk.

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Goat stomach - It is used in the making of cheese.

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