Ingredient review

2,3-Butanediol

INCI: 2,3-Butanediol

A lightweight humectant that helps hydrate skin and improve product feel, with a low risk of irritation.

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In plain English

2,3-Butanediol is a small molecule that attracts water to the skin, acting as a humectant. It's similar to the more common butylene glycol but has a slightly different structure. In skincare, it helps keep products from drying out and gives them a smooth, non-sticky feel. Because it's lightweight, it absorbs quickly and doesn't leave a heavy residue, making it a good choice for people with oily or combination skin.

Quick decision guide

Useful, but context matters

2,3-Butanediol is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging 2,3-Butanediol.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

2,3-Butanediol is a diol (a type of alcohol with two hydroxyl groups) that is synthetically produced. It is a clear, odorless liquid used primarily as a humectant and solvent in cosmetic formulations.

How it works

It works by drawing moisture from the air into the outer layer of the skin (the stratum corneum), helping to keep it hydrated. As a solvent, it also helps dissolve other ingredients and improves the spreadability and texture of the product.

Pros

Lightweight hydration

Provides moisture without a sticky or greasy feel, making it ideal for daytime use or for oily skin types.

Improves product feel

Acts as a solvent to help other ingredients blend smoothly, resulting in a more elegant, non-tacky texture.

Cons and cautions

Moderate hydrating power

While effective, it is not as potent a humectant as glycerin or hyaluronic acid, so it may not be enough for very dry skin.

Synthetic origin

Produced through chemical synthesis, which may not align with preferences for natural or plant-based ingredients.

Best for

  • People with oily or combination skin who want hydration without heaviness
  • Those with sensitive skin looking for a low-irritation humectant

Use caution if

  • Individuals seeking a natural or plant-derived humectant

Usage tips

Use in combination with other humectants like glycerin or hyaluronic acid for enhanced hydration.
Apply to damp skin to maximize moisture retention.

Safety summary

2,3-Butanediol is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin.

Research notes

Research on 2,3-butanediol specifically in cosmetics is limited, but it is structurally similar to butylene glycol, which has been well-studied and is considered safe. Its humectant properties are supported by general knowledge of diols in skincare.

Common label clues

Typical concentration
1–5% in leave-on products; up to 10% in rinse-off products
Regulatory status
Approved for use in cosmetics by the FDA and EU CosIng database as a safe ingredient at typical concentrations.
Common uses
Serums, Moisturizers, Toner, Cleansers
Environmental note
Synthetically produced, so it does not rely on plant harvesting, but its production involves chemical processes that may have environmental impacts.

Good to know

  • 2,3-Butanediol is less common than 1,3-butanediol (butylene glycol) but serves a similar function.
  • It is often used as a safer alternative to propylene glycol for those with sensitivity.

Common questions

What is 2,3-Butanediol in beauty products?

2,3-Butanediol is a small molecule that attracts water to the skin, acting as a humectant. It's similar to the more common butylene glycol but has a slightly different structure. In skincare, it helps keep products from drying out and gives them a smooth, non-sticky feel. Because it's lightweight, it absorbs quickly and doesn't leave a heavy residue, making it a good choice for people with oily or combination skin.

What does 2,3-Butanediol do in a beauty product?

It works by drawing moisture from the air into the outer layer of the skin (the stratum corneum), helping to keep it hydrated. As a solvent, it also helps dissolve other ingredients and improves the spreadability and texture of the product.

Is 2,3-Butanediol safe for most people?

2,3-Butanediol is considered safe for use in cosmetics at typical concentrations. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin.

Who should be careful with 2,3-Butanediol?

Individuals seeking a natural or plant-derived humectant

Research sources

CosIng Database - 2,3-ButanediolOpenPubChem - 2,3-ButanediolOpenFDA - Generally Recognized as Safe (GRAS) NoticeOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.