Pentylene Glycol: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: July 1, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Pentylene Glycol?

Pentylene Glycol, also listed as 1,2-dihydroxypentane, is a clear odorless liquid that belongs to the family of diols, molecules with two hydroxyl groups that readily attract water. Most of the pentylene glycol used in cosmetics is produced in a lab from plant-derived raw materials such as sugar cane or corn. Through catalytic hydrogenation, plant sugars are broken down and rearranged into the five-carbon chain that defines this ingredient. A petroleum-based route also exists, but the shift toward bio-based sources makes the ingredient more appealing to brands focused on sustainability.

The beauty industry started turning to pentylene glycol in the 1990s when formulators needed an alternative to propylene glycol that could do more than just hold water. They found that pentylene glycol not only moisturized but also helped stabilize formulas and boost the performance of other ingredients. Since then it has appeared in a wide range of products: facial masks, hydrating serums, anti-aging creams, daily moisturizers, light lotions, sunscreens, makeup foundations, cleansing waters and even hair conditioners.

Pentylene Glycol’s Cosmetic Benefits/Uses

Pentylene Glycol serves two main roles in skincare formulas

  • Skin Conditioning – its two hydroxyl groups bind water and draw it to the skin surface helping to keep skin smooth supple and comfortably hydrated. This humectant action can make a product feel more moisturizing without a heavy or greasy finish
  • Solvent – it dissolves both water-soluble and some oil-soluble ingredients improving texture and ensuring even distribution of actives preservatives and pigments. By keeping ingredients in solution it helps maintain product stability which means a longer shelf life and consistent performance for the user

Who Can Use Pentylene Glycol

Pentylene Glycol is generally well tolerated by all skin types including dry, oily, combination, sensitive and acne prone because it is lightweight non greasy and has a very low risk of clogging pores.

Most cosmetic grades are produced from plant sugars or synthesized in the lab without any animal input so the ingredient is considered vegan and vegetarian friendly.

Current safety data show no specific risks for women who are pregnant or breastfeeding when Pentylene Glycol is used in normal cosmetic concentrations. This is not medical advice and anyone who is pregnant or nursing should check with a healthcare professional before adding new products to their routine just to be safe.

The ingredient does not make skin more sensitive to sunlight and does not need special timing in a routine. It is also fragrance free and alcohol free which may be helpful for people who react to those components.

Potential Side Effects/Adverse Reactions

Responses to any skincare ingredient can vary from person to person. The issues listed below are potential side effects of Pentylene Glycol and are unlikely for most users when the product is formulated and used correctly.

  • Mild skin irritation such as redness or stinging, more likely in very sensitive skin
  • Transient dryness if the product lacks other hydrating ingredients and is used in a very dry environment
  • Contact dermatitis in rare cases of individual intolerance

If any discomfort or persistent reaction occurs stop using the product and seek advice from a healthcare professional.

Comedogenic Rating

Rating: 0 (non-comedogenic)

Pentylene Glycol is a small water-binding molecule with no oily residues and it evaporates or absorbs rather than forming a film on the skin. Because it does not sit in pores or feed acne-causing bacteria, it earns the lowest possible score on the comedogenic scale.

That makes it suitable for people who are prone to acne or breakouts.

Only in formulas that contain heavy occlusives or waxes could it indirectly contribute to congestion, so look at the full ingredient list if you are highly clog-prone.

Summary

Pentylene Glycol conditions skin by attracting and holding water, keeping the surface smooth and comfortably hydrated. At the same time it acts as a solvent, dissolving other ingredients so they are spread evenly and stay stable in the bottle. This dual action lets formulators reduce extra additives, trim costs and create lightweight textures.

Its ability to multitask without adding greasiness has made it a staple in modern serums, toners, sunscreens and makeup although it still flies under the radar compared with buzzier actives like hyaluronic acid.

Current research shows it is very safe for topical use with a low risk of irritation or allergies. As with any new cosmetic ingredient you should patch test a product that contains Pentylene Glycol to ensure your skin agrees with it.

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