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2,3-Butanediol

What 2,3-Butanediol is & what it does

2,3-Butanediol is a small diol (a molecule with two alcohol groups) that can be produced by fermentation or synthetically. In skincare and sunscreen products it is used as a humectant and solvent, helping to draw in moisture and dissolve other ingredients while also offering some preservative-boosting properties. It contributes a light, non-greasy feel to the formula.

What does 2,3-Butanediol do in skincare?

2,3-Butanediol is used as a humectant and solvent in skincare and sunscreen formulas. It helps draw in and hold moisture, dissolves other ingredients, and can offer some preservative-boosting support. It also contributes a light, non-greasy feel to the product.

Is 2,3-Butanediol safe?

2,3-Butanediol is a small diol used as a humectant and solvent and is generally considered well tolerated at cosmetic levels. It is a simple, water-compatible molecule that can be produced by fermentation. As with any ingredient, those with very sensitive skin can patch test a new product first.

Is 2,3-Butanediol natural or synthetic?

2,3-Butanediol can be either natural-derived or synthetic, depending on how it is made. It can be produced by fermentation of plant sugars, which yields a nature-derived version, or made through chemical synthesis. The label or brand can usually clarify which route a given product uses.

Sunscreens with 2,3-Butanediol

We rate 20 sunscreens that contain it, showing the top 10 by overall score:

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