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BUTYLENE GLYCOL.

Essential CAS 107-88-0 (i), 6290-03-5 (ii) / FRAGRANCE, HUMECTANT, SKIN CONDITIONING, SOLVENT, VISCOSITY CONTROLLING

A lightweight, multi-functional humectant that draws moisture into the skin while enhancing the penetration of active ingredients. This versatile ingredient serves as both a hydration booster and formulation workhorse, improving product texture and stability across all skin types.

moisturizer/humectant solvent viscosity controlling skin conditioning penetration enhancer

Science

Functions as a humectant by attracting and binding water molecules into the stratum corneum from both atmospheric moisture and deeper skin layers. Simultaneously acts as a penetration enhancer by reducing skin barrier resistance and serving as a solvent system that maintains active ingredient stability while facilitating their absorption.


Research

High confidence
Effective range 1–50%
Optimal

8%

Key findings

  1. 01 Demonstrated up to 34% increase in forearm hydration and 35% improvement on dorsal hand hydration in diabetic participants
  2. 02 Achieved highest antimicrobial effectiveness in oil-in-water emulsions at 8% concentration

Transparency

Not commonly dusted
Min. effective
1%
Red flag below
0.5%

Rarely used for dusting due to its functional necessity in formulations; concentrations below 1% suggest potential label padding rather than meaningful contribution


The Formula

Solubility
Water
Optimal pH 3 – 11
0 7 14

Stability

Exceptionally stable across wide pH ranges and temperature variations; hygroscopic properties and heat tolerance make it ideal for diverse formulation environments

Synergies

  • hyaluronic acid
  • glycerin
  • active ingredients requiring penetration enhancement

Conflicts

  • strong oxidizing agents
  • strong acids

Safety

CIR Status
Safe as used
Max tested
50%
Pregnancy
Safe
Sensitization risk Low

CIR Expert Panel safety assessment confirmed in 1985 and reaffirmed in 2011; typical skincare formulations use 1-10% concentrations well below maximum threshold


Your Skin

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Essential

A scientifically-proven, universally compatible ingredient that delivers measurable hydration benefits while optimizing formulation performance and active ingredient delivery.


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