Isopentyldiol
Branched five-carbon diol. Dissolves both oil- and water-soluble actives, boosts their penetration and acts as a mild preservative booster.
Supporting ingredient
It gives a product its texture, stability or shelf life. It has no claimed effect on the skin, so an efficacy tier does not apply. What is known about its safety is below
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Oily, Combination, Sensitive
About this ingredient
Isopentyldiol (3-Methyl-1,3-Butanediol) is a branched 5-carbon diol. Clear oily liquid without color or odor. Replaces heavier glycols (propylene glycol, butylene glycol) in modern formulas. Where applied. Solvent and solubilizer for fat- and water-soluble actives, fragrance carrier, mild preservative booster in creams, serums, toners, perfumes, deodorants (1-10%). Eases penetration of actives into the stratum corneum. In Spain in Sesderma C-Vit, Mesoestetic, Martiderm. Safety. CIR rated isopentyldiol safe at current cosmetic concentrations (2009). EU SCCS has set no restrictions. Irritation and sensitization are rare. Unlike propylene glycol – less pronounced irritation in patients with damaged barrier and atopic dermatitis. Pregnancy and lactation – safe topically. Suitable for all skin types.
Frequently asked questions
Is Isopentyldiol safe during pregnancy?
Isopentyldiol is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Isopentyldiol for?
Isopentyldiol suits: normal, dry, oily, combination, sensitive.
What is Isopentyldiol and what does it do in cosmetics?
Branched five-carbon diol.
What's the INCI name for Isopentyldiol?
The INCI name is Isopentyldiol.
See Isopentyldiol in a product composition right on the store page
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Similar role in the formula
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