Common Name(s): Diisopropyl caprylyl phosphine oxide,dippo c8
DESCRIPTION
What It Does: Helps dissolve and blend difficult-to-solubilize ingredients in formulas.
Why It's Used: A phosphine oxide surfactant providing solubilizing and coupling activity for formulation challenges; useful for improving compatibility between otherwise immiscible ingredients.
How It Works: Phosphine oxide (p=o) group provides zwitterion-like amphiphilicity; the diisopropyl groups add steric bulkiness; caprylic (c8) chain provides lipophilic tail; useful as a hydrotrope or coupling agent.
Typically Found In: Specialty formulations,solubilizer systems,fragrances,specialty cosmetics
TECHNICAL DETAILS
Primary Category: Functional ingredient – solubilizing
Secondary Functions: Coupling agent,surfactant
Application Areas:
Facial Skincare
Body Care
Hair Care
Beard Care
Color Cosmetics (Makeup)
Dietary/Oral Supplements
Typical Concentration Range: 0.1%–2%
SOURCING & ETHICS
Vegan Status: Yes
Halal Status: Yes
Source Notes: Synthetic organophosphine compound.
SKIN COMPATIBILITY
Irritancy Rating: 1/5 – very low
Comedogenicity Rating: 0/5 – non-comedogenic
Sensitivity Concerns: Limited published safety data; use at low functional levels.
Safe for Sensitive Skin: Conditional
SAFETY & COMPATIBILITY
Safety Profile: Limited safety data; use at functional levels. ewg score: 2–3.
Works Well With: Other solubilizers,fragrances,specialty actives
Avoid Combining With: No significant incompatibilities at typical functional levels
SCIENTIFIC NOTE
Phosphine oxide surfactants provide unique amphiphilicity via p=o dipole (similar to sulfoxide surfactants but with phosphorus); diisopropyl caprylyl phosphine oxide is a specialty solubilizer used in advanced cosmetic formulations.
Last Verified: 2026-03-28
Primary Sources: Cosing database,inci dictionary