Butylene glycol on an ingredient list: what Healthline says

Reviewed October 17, 2026

The short answer

Butylene glycol is an alcohol-family ingredient serving as a solvent and conditioner in lotions, serums, masks and makeup. Healthline calls it largely safe on skin, not typically drying or irritating, but also says some experts warn against it, the long-term risk is somewhat unclear, and there are reports of clogged pores and a pregnancy-related animal study.

What is it?

Healthline calls it a glycol, part of the alcohol family, frequently produced from corn that has been distilled. It appears in shampoo, conditioner, lotion, serums, sheet masks, cosmetics and sunscreen, and is especially common in clear gel products and makeup that glides on.

What does it do in a product?

• Healthline: it lowers viscosity, which gives a fluid, even consistency.
• Healthline: it conditions skin and hair, acting as a humectant by coating the surface.
• Healthline: as a solvent it keeps active ingredients dissolved so they do not turn gritty or clump.

Dry skin and acne

Healthline says people with dry skin can generally ease dryness with products containing it. It adds that it is not an active acne ingredient. Moisturizers made for acne-prone skin may include it. Healthline also notes reports of pore blockage or irritation that worsened acne, so response will differ by person.

Allergy

Healthline says nearly any ingredient can cause an allergy. It says the medical literature holds at least one report describing such an allergy and calls these reactions uncommon. Healthline adds that the true frequency is not known, though it looks quite rare.

Pregnancy

Healthline says pregnant women have not been closely studied with this ingredient. It mentions a 1985 rat study in which pregnant animals' offspring were harmed, and says some people advise skipping every glycol and petroleum product while pregnant, on anecdotal grounds. Its advice is to speak with a doctor if you are concerned.

Compared with propylene glycol

Healthline describes the two as similar chemicals with a similar molecular shape, and says propylene glycol is also considered mostly safe in small ingested amounts or in skin care.

How to read it on a label

US cosmetic labels generally list ingredients in descending order of amount, but anything at 1% or less can appear in any order after those above 1%. Its position does not tell you the exact concentration. Judge the whole product, how it feels on your skin, and what changes when you add or drop it.

What not to conclude

This page does not say butylene glycol is safe or unsafe for you. It rests on one Healthline article from 2019, which says long-term effects need more research. If a product with it irritates your skin or your breakouts worsen, stop using it and ask a dermatologist.