Propylene glycol in food is a common additive found in many grocery store items. This substance helps maintain consistency, moisture, and texture in processed foods. Besides food, it is also present in cosmetics, dog food, and medications. Understanding its uses, benefits, and potential risks can help consumers make informed decisions about their diets.
What Is Propylene Glycol?
Propylene glycol is a colorless, nearly odorless, and tasteless thick liquid used extensively in various industries. Manufacturers typically make it from petroleum, though some now produce it from plant sources like canola and soybean. They also refer to propylene glycol as trimethyl glycol, methyl ethyl glycol, and propanediol — the latter derived from corn.
How PG Enters Your Body
People encounter propylene glycol through several routes:
- Ingestion: Consuming foods or medicines containing it.
- Inhalation: Breathing air with its mist.
- Skin Contact: Using creams or cosmetics that include it.
Given its widespread applications, propylene glycol reaches most people at some exposure level.
Uses of PG in Food
Propylene glycol has several roles in the food industry:
- Thickener: It enhances the texture and taste of foods, improving their “mouth feel.”
- Emulsifier: It binds ingredients that typically do not mix well, such as oil and water, which is especially useful in low-fat foods.
- Stabilizer: It helps maintain the stability of emulsions, ensuring products like mayonnaise remain thick and uniform.
- Anticaking Agent: It prevents clumping in powdered products like salt, cake mixes, and cocoa.
- Humectant: It retains moisture in baked goods, keeping them fresh.
- Antioxidant: It extends the shelf life of foods by preventing oxidation.
- Processing Aid: It enhances the appearance and quality of food products.
Beyond food, manufacturers use propylene glycol to generate artificial smoke for firefighting demonstrations or theater shows, stabilize drugs, strip excess moisture to extend pharmaceutical shelf life, inhibit bacterial growth in cosmetics, and act as a solvent in paints and plastics.
Grades of PG Used in Food
Propylene glycol comes in different grades for various applications:
- Food Grade: You can find this type in seasonings, soups, teas, soft drinks, and baking mixes.It prevents caking, protects against moisture, and enhances flavor. The FDA considers it safe for consumption.
- USP Grade: This high‑purity grade meets United States Pharmacopeia standards. Manufacturers use it in food, drugs, and medicines, as well as a food stabilizer, skincare moisturizer, and solvent for drug formulations.
- What potential health risks can propylene glycol pose to humans?
- Are there any natural alternatives to propylene glycol?
- What rules do different countries and regions enforce for propylene glycol?
- Propylene Glycol Alginate: Made from brown seaweed, this version acts as a thickener, emulsifier, and stabilizer in dairy products, beer foam, and other products. It’s considered safe by the FDA.
Foods Containing Propylene Glycol
Many processed foods benefit from the properties of propylene glycol. Some examples include:
- Seasoning Blends
- Dried Soups
- Salad Dressings
- Baking Mixes (cakes, muffins, biscuits, pancakes)
- Powdered Drink Mixes
- Flavored Teas
- Soft Drinks
- Alcoholic Beverages
- Food Coloring
- Flavoring Extracts
- Highly Processed Snacks
- Fast Foods
- Flavored Popcorn
- Cake Frosting
- Ice Cream Flavors
- Mass-Distributed Baked Desserts
- Marshmallows
- Dried Coconut Shreds
- Sauces
- Sour Cream
- Potato Salad
Potential Health Risks of Propylene Glycol in Food
While the FDA and other regulatory bodies consider propylene glycol in food safe, some concerns have been raised about its potential health risks:
- Worsened Kidney and Liver Disease: For individuals with normal liver and kidney function, the body can efficiently process and excrete propylene glycol. However, in large quantities, it can lead to kidney failure and acidosis due to lactic acid buildup.
- Allergic Reactions: A small percentage of people are allergic to propylene glycol, experiencing skin reactions like dermatitis and rashes.
- Increased Heart Attack Risk: High doses of propylene glycol, especially when injected, can cause rapid heart rate, heart rhythm problems, or low blood pressure.
- Seizures: There have been reports of infants experiencing seizures after receiving large doses of vitamin D administered with propylene glycol. Similar occurrences have been noted in adults with high doses of drugs containing propylene glycol.
Who Is at Risk of PG Toxicity?
Toxicity from propylene glycol is rare and usually occurs from consuming amounts far beyond what is found in typical food products. Those at higher risk include:
- People with Kidney or Liver Disease: These individuals have a slower process of eliminating propylene glycol from the body.
- People with Impaired Alcohol Dehydrogenase Enzyme System: Children under four, pregnant women, people with liver disease, and those taking certain medications (like disulfiram or metronidazole) often have lower levels of this enzyme, making them more susceptible.
- Burn Patients: Those receiving numerous skin treatments containing propylene glycol can develop hyperosmolar metabolic acidosis.
- People with Epilepsy: Large doses can trigger seizures.
Treatment for propylene glycol toxicity may involve kidney dialysis or administering fomepizole, a drug that inhibits the enzyme breaking down propylene glycol, preventing toxic levels.
How to Avoid Propylene Glycol in Your Food
If you want to reduce your intake of propylene glycol in food, consider the following steps:
- Read Labels: Check food labels for propylene glycol, propylene glycol mono and diester, or E1520.
- Limit Processed Foods: Prepare your own salad dressings and baking mixes to avoid the additive.
- Choose Whole Foods: Focus on eating unprocessed, whole foods.
Is Propylene Glycol Safe?
The FDA classifies propylene glycol as “generally recognized as safe” (GRAS). This designation indicates that experts consider it safe under its intended use. European and Canadian authorities also deem it safe, although Europe imposes stricter limits on its usage levels. Importantly, propylene glycol is often confused with ethylene glycol, which is highly toxic. However, propylene glycol is non-toxic and safer, even being used in non-toxic antifreeze formulations.
Propylene glycol in food serves many useful purposes, from enhancing texture and moisture to extending shelf life. Despite some health concerns, regulatory bodies generally regard it as safe for consumption. To minimize exposure, consumers can opt for fewer processed foods and more whole foods, ensuring a healthier diet.
