INCI: Pentylene Glycol - Also known as: 1,2-Pentanediol, Pentanediol

QUICK FACTS

What is pentylene glycol?

Pentylene glycol (1,2-pentanediol) is a five-carbon glycol produced either synthetically or via bio-based fermentation routes from sugarcane or corn-derived feedstocks. It belongs to the same structural family as propanediol and hexylene glycol, sharing the 1,2-diol configuration that gives this class of glycols both their water-miscibility and their mild antimicrobial character. Its five-carbon chain length places it between the shorter-chain propanediol (three carbons) and hexylene glycol (six carbons), giving it a balance of hydrophilic and mild lipophilic character that makes it versatile across both water-based emulsions and more complex formula environments.

In cosmetic formulation, pentylene glycol is used primarily as a multifunctional ingredient combining humectant, solvent, and co-preservative roles. Its 1,2-diol structure - two hydroxyl groups on adjacent carbons - gives it both water-attracting character and antimicrobial membrane activity at low concentrations. This makes it a useful addition to preservation systems as a booster that reduces the overall preservative load while maintaining broad-spectrum microbial protection.

At Sweet Chemistry, pentylene glycol appears below the 1% line in the three water-based formulas alongside the broader preservation system of phenoxyethanol, ethylhexylglycerin, and caprylyl glycol. Its placement in the ingredient list near the amino acid complex reflects its position in the below-1% tier, where it contributes to the formula's stability and skin-feel system without serving as a dominant functional ingredient in any single category.

DEFINITION - What does it do for skin?

Pentylene glycol's contribution to skin operates across three complementary dimensions. As a humectant, its two hydroxyl groups interact with water molecules and support moisture retention at the skin's surface - a mild but additive contribution to the broader humectant system that includes glycerin, sodium PCA, sodium lactate, and hyaluronic acid in the same formulas.

As a solvent, pentylene glycol supports the clean dissolution of low-solubility actives within the formula's water phase. In high-active formulas where the full complement of peptides, ceramides, antioxidants, and NMF components must remain in stable solution, glycols that contribute solubilizing character help maintain the homogeneity of the formula across its shelf life and use cycle.

As a co-preservative, pentylene glycol's antimicrobial character - studied in connection with disrupting microbial cell membranes at low concentrations - adds an additional layer of microbial suppression to the preservation system. Like ethylhexylglycerin and caprylyl glycol, its inclusion means that phenoxyethanol can function effectively at a lower concentration than it would require as a standalone preservative, keeping the total preservation profile lean while maintaining broad-spectrum protection.

At the skin surface, pentylene glycol's mild conditioning character leaves a smooth, non-tacky skin feel that is compatible with the cushioned satin finish of the Hydra-Cream and the lightweight natural finish of the Hydra-Serum.

FOUND IN

In 3 Formulas

Pentylene glycol is present in all three Sweet Chemistry water-based formulas below the 1% line, contributing to the preservation, solubilization, and skin-feel system of each product.

Nourishment - All Skin Types

Barrier Repairing Hydra-Serum Pentylene Glycol - 1.0 oz / 30 ml

The Hydra-Serum delivers pentylene glycol within the below-1% support system of a 40%-active emulsion containing 3% Matrikynes® peptides, 5% niacinamide, and 3% ceramides.

Hydration - Dry to Normal

Elasticity Reinforcing Hydra-Cream Pentylene Glycol - 1.7 oz / 50 ml

In the Hydra-Cream, pentylene glycol contributes to the stability and preservation system of a 40%-active formula delivering 3% Matrikynes® peptides, 2% THD ascorbate, and the full ceramide barrier complex.

Hydration - Dry to Dehydrated

Elasticity Reinforcing Lipid-Cream Pentylene Glycol - 1.7 oz / 50 ml

In the Lipid-Cream, pentylene glycol supports the stability of a 46%-active emulsion - the highest active concentration in the water-based Sweet Chemistry range.

WORKS TOGETHER WITH

Primary Preservative Phenoxyethanol

INCI: Phenoxyethanol.

The primary antimicrobial preservative in all three water-based Sweet Chemistry formulas. Synergy Note: Pentylene glycol's antimicrobial co-preservative character broadens the preservation system's coverage, allowing phenoxyethanol to function at a lower concentration than a standalone preservative approach would require.

Co-Preservative Ethylhexylglycerin

INCI: Ethylhexylglycerin.

A glyceryl ether co-preservative in all three water-based formulas. Synergy Note: Pentylene glycol and ethylhexylglycerin both contribute co-preservative support from different structural classes of glycol - together with phenoxyethanol and caprylyl glycol they form a multi-component preservation system with broad-spectrum coverage.

Bio-Derived Glycol Propanediol

INCI: Propanediol.

A three-carbon glycol present in all four Sweet Chemistry formulas as a humectant and solvent. Synergy Note: Propanediol and pentylene glycol are both bio-derivable glycols with complementary chain lengths - propanediol's three-carbon structure provides stronger hydrophilic humectant character, while pentylene glycol's five-carbon length adds a slightly more lipophilic solvent dimension to the same formula.

ECM Peptide Complex Matrikynes® Bone Peptides

INCI: Hydrolyzed Cow Bone Extract.

At 3% in all four formulas, associated with improvements in the appearance of skin density and aging signs. Synergy Note: Pentylene glycol's solvent contribution supports the clean dissolution and consistent delivery of the Matrikynes® peptide complex within the water phase of all three water-based formulas.