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

Priya Singh
Fact-Checker: Priya Singh
This article was last updated on: July 10, 2023
Table of Contents

Imagine finding yourself entranced by the packaging of a new skincare product, seduced by its promising claims and the unanimous rave reviews it has gathered from beauty aficionados around the world. You’ve made up your mind to take it home, but as you flip the product to inspect its ingredients list, you’re met with an intimidating assortment of scientific names that are as mystifying as they are tongue-twisting. It can feel like you need a degree in cosmetic science just to decipher what you’re actually putting on your skin.

One such ingredient that frequently crops up within these lengthy lists is Butylene Glycol, a name that might send a shiver down your spine with its chemical-like connotation. But does its complex-sounding name belie a friend or foe to your skincare routine?

In this article, we’ll be plunging headfirst into the intricate, fascinating world of Butylene Glycol. We’ll unravel why this ingredient has become a staple within the cosmetic industry, exploring its various roles and benefits while also discussing any potential side effects.

What is Butylene Glycol?

Butylene Glycol, also known as 1,3-Butanediol or BG, is a common ingredient found nestled within the formulation of a plethora of cosmetic products. This versatile compound, part of the glycol family, is a colorless, organic alcohol used to enhance the overall performance and feel of many skin, hair, and makeup products.

Its general purpose within these products is multi-faceted. Primarily, it serves as a solvent, making it easier for other ingredients to mix harmoniously into a smooth and stable formulation. Additionally, it’s used as a humectant to prevent moisture loss, keeping your products from drying out while simultaneously offering a refreshing, hydrating effect on your skin. It also helps to control the viscosity, or thickness, of products, making them more spreadable and easy to use.

It’s noteworthy that the concentration of Butylene Glycol in your products is generally low, often found at a single-digit percentage of the total formulation. It isn’t typically available as a standalone product due to its role as a supportive, but essential, component in cosmetic formulations.

Who Can Use Butylene Glycol?

Butylene Glycol is a versatile ingredient that’s generally suitable for all skin types, from dry to oily, sensitive to mature. Its hydrating qualities can provide benefits to those seeking a moisture boost, and its ability to assist in ingredient penetration may benefit those looking for enhanced efficacy from their skincare regime.

The good news for conscious consumers is that Butylene Glycol is a synthetic ingredient that doesn’t rely on animal sourcing, making it suitable for vegans and vegetarians.

For those wondering about its use during pregnancy or breastfeeding, Butylene Glycol is generally regarded as safe. However, as with all skincare ingredients and especially during these sensitive times, it’s always recommended to consult your healthcare provider for personalized advice.

Butylene Glycol Skin Benefits

Butylene Glycol has garnered a much-deserved reputation within the cosmetics industry and among skincare enthusiasts due to its impressive array of skin benefits. Based on its official functions as described by CosIng, here are the crucial benefits that make Butylene Glycol a beloved ingredient:

  • Humectant: One of the primary roles of Butylene Glycol is its function as a humectant. This means it has the ability to attract and hold onto water, much like a sponge. It helps maintain optimum hydration levels in our skin by drawing water from the deeper layers and the environment and delivering that moisture to the surface layers of the skin. This all translates into skin that feels plumper, smoother, and softer.
  • Skin Conditioning: As a skin conditioner, Butylene Glycol improves the appearance and texture of the skin. It helps create a smoother, supple, and more youthful-looking complexion. This is achieved by enhancing the skin’s natural moisture barrier, promoting overall skin health, and working to maintain the skin’s hydration levels.

It’s important to note, however, that as wonderful as these benefits are, they’re not permanent. To maintain the gains and continuously reap the benefits of Butylene Glycol, it’s crucial to keep it as a regular player in your skincare routine.

Butylene Glycol’s Non-active Cosmetic Uses

While Butylene Glycol offers a multitude of skin benefits as an active ingredient, it also plays an integral part in the formulation of cosmetics for its non-active or auxiliary benefits. These benefits might not directly affect your skin but contribute significantly to the product’s functionality, usability, and overall aesthetic appeal. The non-active facets of Butylene Glycol based on its official CosIng functions, include:

  • Solvent: Butylene Glycol acts as an excellent solvent, meaning it can dissolve or incorporate other ingredients in a formulation effectively. This is particularly crucial in cosmetics, where multiple ingredients may need to meld together harmoniously to create a stable, homogeneous product. By dissolving the constituents, it ensures a smooth, even texture, contributing to a higher-quality product without clumps or separated components.
  • Viscosity Controlling: Controlling the thickness or viscosity of a cosmetic product is paramount to its effectiveness and user experience. Butylene Glycol helps adjust the formulation’s viscosity, making creams spreadable, serums silkier, and allowing for a consistent, easy application. This function enhances the overall sensory experience of the product, ensuring it goes on smoothly and evenly, without a sticky or heavy feel.
  • Fragrance: Butylene Glycol is sometimes used as a fragrance ingredient or carrier in cosmetic products. While it doesn’t have a notable scent itself, it can help transport and diffuse other fragrances within a product. This use contributes to the olfactory appeal of cosmetics, making your skincare routine a more sensorial, enjoyable ritual.

Remember, each of these roles may not actively improve your skin’s health or appearance, but they are invaluable to the formulation of an effective, enjoyable cosmetic product.

Butylene Glycol Potential Side Effects

As with any ingredient contained in our skincare products, responses can vary dramatically from person to person. Our skin, being the complex, individual organ that it is, reacts differently to various substances based on numerous variables. Factors such as your skin type, overall skin health, and specific skin concerns can influence how your skin reacts to an ingredient. Understanding your skin’s unique characteristics and needs is paramount in anticipating its response, so you might want to take a moment to find your skin type.

While Butylene Glycol is generally safe, a small percentage of individuals may experience side effects. Some of the potential side effects include:

  • Skin Irritation: For some, Butylene Glycol may cause mild skin irritation or redness. This may be more prevalent in those with sensitive skin.
  • Allergic Reactions: Although rare, there have been instances where users experienced an allergic reaction to Butylene Glycol. Symptoms could include itchiness, redness, and swelling.

Should you experience any adverse effects from using a product containing Butylene Glycol, stop using the product immediately and consult a doctor or dermatologist if the symptoms persist.

However, it’s important to note that adverse reactions to Butylene Glycol are fairly uncommon. As a rule, this ingredient is considered to be safe and effective for use in cosmetic products, having been extensively researched and approved by numerous authoritative bodies.

Finally, it’s crucial to remember that patch testing is an essential step before introducing any new product into your skincare routine. This simple precautionary step can save you from potential discomfort by indicating early if you’re likely to react negatively to a product. Here is our helpful patch-testing guide to get you started. That way, you can explore your skincare options with confidence, knowing you’ve taken the necessary measures to protect your skin’s health.

Comedogenic Rating

In terms of comedogenicity, or the potential of a substance to clog pores and trigger acne, Butylene Glycol sits comfortably at level 1 on a 0-5 scale. This scale, ranging from 0 being non-comedogenic to 5 being highly comedogenic, measures an ingredient’s likelihood of clogging pores, leading to breakouts.

Butylene Glycol earns this low comedogenic rating due to its lightweight consistency and its nature as a solvent, which actually helps to break down other ingredients rather than layering them onto the skin’s surface. This makes it unlikely to block pores and contribute to acne formation, even for those with acne-prone or oily skin. So, if your skin is susceptible to breakouts, you can breathe easy. Butylene Glycol, with its low comedogenic score, may well be a suitable ingredient to include in your skincare regime.


Embarking on a skincare journey involves a fair bit of experimentation, patience, and an air of scientific curiosity. We understand that navigating the labyrinthine world of skincare ingredients can be daunting, especially when they come with names as formidable as Butylene Glycol.

This ingredient, however, deserves a chance to prove its worth. It offers both active and non-active effects, enhancing the efficacy and enjoyment of skincare products. It instantly gratifies with its skin-conditioning and hydrating benefits while quietly working backstage to ensure your products maintain their texture, fragrance, and longevity.

The choice to use products containing Butylene Glycol might be influenced by its ability to enhance other ingredients’ effectiveness and its suitability for all skin types. It’s like the diligent stagehand that ensures the star ingredients can shine brilliantly under the spotlight.

In terms of its reputation, Butylene Glycol is far from being an unusual or radical ingredient. It’s rather commonplace in the cosmetics industry due to its versatility and efficiency. While it might not have the buzz-worthy status of ingredients like Retinol or Hyaluronic Acid, it quietly performs its roles, ensuring your skincare routine runs as smoothly as a Broadway show.

The timeline for seeing visible results from an ingredient like Butylene Glycol can vary. As a supporting actor, its effects might be more subtle and take longer to notice than the immediate results from star ingredients. However, with consistent use, you should notice improved hydration and a smoother texture over time.

If you have concerns about potential side effects, remember that these are rare and Butylene Glycol is generally very well tolerated. Listen to your skin, monitor its response, and adjust your routine accordingly. Skincare is a personal journey, and what works for one may not work for another, making openness to experimentation and flexibility key to achieving your skin goals.

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