Butylene Glycol

Benefits
Hair Loss PreventionMoisturizingSoftening

What is Butylene Glycol?

Butylene glycol, or 1,3-butanediol, is a synthetic diol alcohol produced through petrochemical distillation or corn fermentation. This clear, nearly odorless liquid is a staple in water-based cosmetics like moisturizers, toners, serums, and cleansers. It functions primarily as a humectant by binding water molecules to the skin's outer layer, enhancing surface hydration. As a solvent, it dissolves lipophilic and hydrophilic actives for uniform blending. It also regulates product thickness for smooth application, stabilizes emulsions, and subtly aids ingredient penetration without deep absorption itself. In fragrance systems, it dilutes scents and covers off-notes, contributing to a pleasant user experience across daily skincare routines.

Comedogenic Rating 1/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Fragrance ingredient
Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
Solvent
Dissolves and carries other ingredients, helping control viscosity, evaporation rate, and delivery of actives in both water- and oil-based systems.
Viscosity controlling agent
Adjusts thickness to the desired level for stability and usability, improving dispensing, suspension, and texture across many formulation types.
Humectant
Attracts and holds water in the stratum corneum, boosting hydration and plumpness; commonly used in moisturizers, cleansers, and hair conditioners.
Masking
Reduces perception of unpleasant odors or tastes by neutralizing them or covering them with more acceptable sensory notes.

Benefits

Draws moisture to skin for lasting hydration

Promotes softer, smoother skin feel

Helps maintain hair health and reduce loss

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals with dry or dehydrated skin
Those with known sensitivity to glycols
Those seeking improved product spreadability and absorption
Individuals prone to rare contact allergies
People looking for gentle softening effects in routines
People with severely damaged skin barriers

Safety Notes

  • Generally recognized as safe for cosmetic use by regulatory reviews
  • Presents low risk of irritation in typical formulations

Frequently Asked Questions about Butylene Glycol

What does butylene glycol do in skincare?

It hydrates as a humectant, dissolves ingredients as a solvent, and adjusts texture for better feel.

Is butylene glycol comedogenic?

It has a low comedogenic rating, making it unlikely to clog pores for most users.

Can butylene glycol help with hair?

It supports hair products by aiding moisture retention and potentially preventing loss.