9 Everyday Products You Didn't Know Had Animal Ingredients

shot of woman in pants holding plastic bag

 Treehugger / Jordan Provost

If you thought that by quitting meat or at least going weekday vegetarian you were doing your part to avoid factory farming, think again.

Even though animal products might not be in as many places as some think (for instance, most "catgut" tennis rackets are made with synthetic materials now) they spread far beyond just those hidden in food: everywhere from your car to the bathroom and the sky on the 4th of July.

In short, after an animal is slaughtered, its byproducts are sorted into edible and inedible parts. Approximately 55% is considered an edible byproduct, while the remaining 45% is classified as inedible. These inedible animal byproducts are used a variety of industries, including cosmetics, fabrics, pharmaceuticals, and more.

1. Plastic Bags

empty plastic bags on gray surface
Treehugger / Jordan Provost  

Many plastics, including shopping bags, contain "slip agents," which reduce the friction in the material. What are those made of? Animal fat.

In a more technical explanation from Genetic Engineering and Biotechnology News: "Although polymers are manufactured from petroleum feedstock, plastics manufacturers often use additives of animal origin to improve material properties and/or to aid in processing of raw polymers."

Also, watch out for new plastics coming out: Researchers are experimenting with keratin protein found in chicken feathers to produce plastics, adhesives and non-woven materials.

2. Car and Bike Tires

bike tire rubber
Treehugger / Jordan Provost 

Even when food can have hidden animal ingredients, you can still take the time to look at the label to see it. With your car or bike tires, it's a little more difficult. But here's the trick: check with the manufacturer if their stearic acid is animal-based or plant-based. Stearic acid is used to help the rubber in tires hold shape under steady surface friction.

3. Glue in Wood Work and Musical Instruments

closeup violin and its strings
Treehugger / Jordan Provost 

Animal glue (made from the boiling of animal tissue and bone) is used as an adhesive for building and repairing musical instruments in the violin family. Other synthetic glues can also be used, but hide glue is considered the standard. Hide glue is also used in antique restoration and other specialty woodworking.

4. Biofuels

older man mows lawn with house behind
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Sugar cane and corn are what come to mind at first when we think about biofuels, but over the past years the use of animal fats to produce these has extended.

There's actually beef biodiesel (which Matthew called a "bone-headed idea" last year) and chicken biodiesel to choose from.

5. Fireworks

The same component used in the tire industry, stearic acid, is present in the production of fireworks. Stearic acid is used to prevent oxidation of metal powders so that the firework compositions can be stored for as long as possible.

6. Fabric Softener

stack of green towels in tiled bathroom
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It was big news on TreeHugger some time ago: Downy fabric softener contains Dihydrogenated tallow dimethyl ammonium chloride, which comes from the cattle, sheep and horse industry. They sure won't put that in the usual 'all-so-soft' advertising.

7. Shampoo and Conditioner

non branded shampoo and conditioner in bath
Treehugger / Jordan Provost  

Annie Leonard warned us about the hazardous chemicals in the cosmetics industry, but didn't necessarily emphasis the animal ingredients.

According to PETA, there are more than 20 components from animals that could be in your shampoo and conditioner. The tricky part is when you read "Panthenol", "Amino acids", or "Vitamin B" in a bottle (just to name a few), it can be either from animal or plant source -- making it hard to tell. Some companies make a point to avoid communicating details about ingredients and production processes to avoid putting off consumers.

Best way to be sure? Look for vegan brands or products which state that no animal products were used.

8. Toothpaste

blue toothpaste squeezed out
Treehugger / Jordan Provost 

Glycerin is found in animal and vegetable fats. When separated out, glycerin is used in a wide variety of products, including toothpaste. As with some other ingredients, when you read 'glycerin' on shampoo and conditioner, it can be either animal or plant based. But many products from commercial brands like Colgate claim to be animal-free and suited for vegetarians.

9. White and Brown Sugar

brown and white sugar piles on gray area
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What about hidden products in the manufacture process? Among vegetarians and vegans, it's known that purified ash from animal bones is used in filters to refine sugar by some brands, though there are other companies that use filters with granular carbon or ion exchange systems. What not all may know is that brown sugar is also refined, only to have molasses added after.

You can opt for unrefined organic sugar or choose the brands that PETA says are vegan.

raw cow bones with meat attached
Treehugger / Jordan Provost  

It's important to note that getting to know where animal products go is not just for vegetarians or vegans: These byproducts are very likely not sourced from responsible organic farmers, but from the abysmal and extremely polluting factory farms. So even if you're a conscious omnivore, watch out.

View Article Sources
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  2. Shi, Ting, et al. “Investigation of Air-Liquid Interface Rings in Buffer Preparation Vessels: the Role of Slip Agents.” PDA J Pharm Sci Technol, 2016, vol. 70, pp. 272-81., doi:10.5731/pdajpst.2015.005736

  3. Morris, Barry A. “The Science and Technology of Flexible Packaging:Multilayer Films from Resin and Process to End.” Elsevier Science. 2016.

  4. Martinez-Hernandez, Ana Laura, and Carlos Velasco-Santes. “Keratin Fibers from Chicken Feathers: Structure and Advances in Polymer Composites.” in Dullaart, Renke, et al. (Editors). Keratin: Structure, Properties and Applications. Nova Science Publishers. 2012., pp. 149-211.

  5. Adding Value Products Made from Iowa's Agricultural Commodities. Iowa Department of Agriculture and Land Stewardship. 1999.

  6. Hide Glue.” Acoustic Music.

  7. Economics of Biofuels.” Environmental Protection Agency.

  8. Table of Standard Fireworks Chemicals.” U.S. Department of Transportation.

  9. Smith, E.G. Collective. Animal Ingredients A-Z (Third Edition). AK Press. 2004.

  10. Messer, Kent D., et al. “Labeling Food Processes: The Good, the Bad and the Ugly.” Applied Economics Perspectives and Policy, 2017, vol. 39, pp. 407-427., pp. 407-427. doi:10.1093/aepp/ppx028

  11. Young, Robin V. and Suzanne Sessine. World of Chemistry. Gale. 2000.

  12. Is Your Sugar Vegan?.” The Vegetarian Resource Group.

  13. Are animal ingredients included in white sugar?.” People for the Ethical Treatment of Animals.