What is 1,5-pentanediol used for in skincare?

It acts primarily as a humectant to hydrate skin, a solvent to dissolve ingredients, and an antimicrobial booster to support preservative systems.

Is 1,5-pentanediol safe for sensitive skin?

Yes, it is generally considered mild and non-sensitizing, though it may cause minor stinging if applied to broken or reactive skin.

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1,5-Pentanediol

Also known as: pentane-1,5-diol, pentamethylene glycol

1,5-Pentanediol is a synthetic diol used in cosmetics as a humectant, solvent, and antimicrobial booster. It helps draw water into the upper skin layers while enhancing the penetration and preservation efficacy of other ingredients. It is generally well-tolerated with a low risk of skin irritation.

Humectant & solventVegan

BenefitModerate 1.8 / 4

Hydration i1.8 / 4

Whether the ingredient helps increase the skin’s water content — humectants that attract water, ingredients that reduce water loss, or ones that make skin feel less dry.

RiskLow 1 / 4

Eye irritation i1 / 4

Whether it may sting or irritate around the eyes. Relevant for sunscreens, fragrances, acids, surfactants, and volatile ingredients.

Irritation i0.8 / 4

Risk of short-term irritation — stinging, burning, dryness, redness, or discomfort. Common for strong actives, acids, retinoids, fragrances, and harsh surfactants.

Rated by SpottyLabs' ingredient methodology, independent of brands.

What it helps with

Hydrates skin by binding moisture
Enhances absorption of other ingredients
Boosts product preservation

Things to watch

Mild skin irritation at high levels
Potential eye stinging

See how this matches your skin

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Products with 1,5-Pentanediol

BioNike

Defence Hair Shampoo Nutriente

4.2/ 514/15/4

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Frequently asked questions

What is 1,5-pentanediol used for in skincare?: It acts primarily as a humectant to hydrate skin, a solvent to dissolve ingredients, and an antimicrobial booster to support preservative systems.
Is 1,5-pentanediol safe for sensitive skin?: Yes, it is generally considered mild and non-sensitizing, though it may cause minor stinging if applied to broken or reactive skin.