Glycerin has humectant properties, which means it extracts water from the dermis (the underlying layer of the skin), pulling the water into the surface of the skin.
In commercial skin moisturizing products, glycerin is often combined with various other types of compounds to optimize its therapeutic moisturizing effects. Glycerol is considered by some experts to be the most effective humectant available.
Common Uses
Glycerin is often added to many different types of skincare products because it attracts moisture and improves the appearance of dry skin. But there are many other uses for glycerin.
In addition to cosmetic industry products, glycerin is also used in a wide range of products by the food and pharmaceutical industries. Some common uses include:
Baby productsGluesThroat lozengesEmbalming fluids (used by morticians)Food products (such as sweeteners, processed foods, packaged foods, frozen foods)Pharmaceutical products (such as suppositories, cough medicines, some types of anesthetics, and other medications)Toothpaste (keeps it from drying up in the tube)SoapsCandlesDeodorantsMakeup
One of the most common uses for glycerin today is its role in face and body moisturizers and other skincare products.
Other Uses
In addition to being a humectant, glycerin is commonly used as a:
Hyperosmotic laxative (drawing water to the bowels to treat constipation)Vehicle for numerous pharmaceutical preparationsAgent to help oil and water-based ingredients mix efficientlySweetening agentThickening agentMoistening agentPreservative
Benefits of Glycerin
There are many benefits of glycerin when used topically (on the skin). These include:
Promotes the skin barrierMoisturizes the epidermisSpeeds up the wound healing processProtects skin from irritantsOffers an antimicrobial effectImproves skin in conditions such as atopic dermatitis
Potential Side Effects
Although glycerin is not known to have many serious side effects, it’s always possible to have an adverse reaction to any substance.
Contact dermatitis results from direct skin exposure to a specific chemical substance. Symptoms of contact dermatitis may include:
Skin irritationRash (which may take days or weeks to heal)InflammationAngioedema (swelling in the deep layers of the skin)Itching
If you have any type of skin rash, redness of the skin, or itching after applying a skin product with glycerin, discontinue its use right away. If the rash doesn’t go away, be sure to consult with your healthcare provider.
Other Side Effects
Other side effects of glycerin may include dehydration of the skin. As a humectant, glycerin draws water from the nearest source. Especially in low-humidity conditions, the nearest source of water is the lower levels of your skin. This can dehydrate the skin.
Severe dehydration of the skin could result in blistering. For this reason, it’s a good idea to dilute pure glycerin before using it on your face and skin.
A 2011 study showed that using rosewater had antioxidant effects and helped to improve glycerin’s skin barrier function up to 24 hours after application.
Study on Side Effects of Glycerin
In a randomized, double-blind study, participants with atopic dermatitis were treated with one of three different treatments for 30 days:
1. A moisturizing cream with 20% glycerin
2. A moisturizing cream without glycerin (placebo)
3. Skin cream with 4% urea and 4% sodium chloride
Adverse skin reactions—such as a sharp local superficial sensation called smarting—were found to be significantly less among the study participants who used the moisturizing cream with glycerin, as compared with the placebo cream or the urea-saline cream.
Safety and Effectiveness
Safety
Glycerin is considered safe by the Food and Drug Administration (FDA). It’s also said to be:
NontoxicEasy to digest (when taken internally)Pleasant tastingOdor-free
Effectiveness
According to a 2016 study, glycerin is the most effective humectant in comparison with numerous other types of humectants, including:
Alpha hydroxy acids, such as lactic acid and glycolic acidHyaluronic acidPropylene glycol and butylene glycolSorbitolUrea
A Word From Verywell
Although glycerin is considered safe and effective for most people, it’s important to keep in mind that everyone’s skin (and body) is different. What works well for one person is not always effective for someone else. Also, there is always a risk that any type of skincare product could cause side effects (such as an allergic reaction).
Always read and follow the label instructions carefully when using glycerin (or any other skincare products).
