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Dimethyl Isosorbide

Penetration-enhancing sorbitol-derived solvent used in bioavailability-optimised retinoid formulations. Significantly improves dermal delivery of lipophilic actives including hydroxypinacolone retinoate.

Benefits
  • Penetration enhancer — increases dermal delivery of lipophilic actives
  • Solubilises retinoids and poorly water-soluble actives
  • Low skin irritation profile
  • Biodegradable — sorbitol-derived
  • Improves homogeneous active distribution in formulation
Example uses
  • Bioavailability-optimised vitamin A creams
  • Retinoid serums
  • Drug delivery enhanced formulations
  • Anti-ageing actives vehicles
  • Brightening serum bases
Mechanism of action
Small amphiphilic molecule inserts into stratum corneum lipid bilayers, transiently increasing their fluidity and creating pores facilitating passage of co-dissolved actives. Unlike many penetration enhancers, does not cause significant membrane perturbation at cosmetic use concentrations.
Clinical evidence · Moderate

Multiple studies demonstrate 2–5x improvement in retinoid percutaneous penetration vs. standard vehicles. Mechanism well-characterised.

Effective concentration range
5–20%
Formulation notes
Bio-derived from sorbitol. Miscible with water and most cosmetic solvents. Typically used at 5–20% for meaningful penetration enhancement.
Watchouts
At high concentrations can increase percutaneous absorption beyond desired levels for co-formulated ingredients — must be assessed holistically. Enhanced penetration applies to all co-formulated ingredients, not only the target active.
Controversies & overclaims
The penetration-enhancing effect means all co-formulated ingredients should be re-evaluated at increased absorption levels — this complexity is rarely communicated to consumers.
Market positioning
Marketed as bioavailability booster for retinoids. Accurate functional claim. Full-formulation penetration enhancement implications are underreported.
Comedogenicity

0 / 5

Sensitisation risk

Low

INCI & aliases

Dimethyl Isosorbide

DMI · dimethyl isosorbide sorbitol-derived

Clean beauty perception

Generally accepted in clean beauty given sorbitol origin. Valued in efficacy-first formulations.

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