Is Polyglyceryl-3 Diisostearate Comedogenic? (Rating: 2/5)
Reviewed by Vanessa A. (Formulation Researcher) · Clinical assay verified
Comedogenic Rating: 2 (Moderately Low Risk)
Polyol ester emulsifier used in W/O systems; mild comedogenic potential due to isostearate moiety.
Ingredient Specifications
| Specification | Clinical Value |
|---|---|
| Comedogenic Scale Rating | 2 / 5 (2 (Moderately Low Risk)) |
| Cosmetic Category | ester |
| Known INCI / Aliases | polyglyceryl-3 diisostearate |
| Follicular Occlusion Risk | Moderate — concentration and skin barrier dependent |
Mechanism in Sebaceous Follicles
Cosmetic ingredients interact directly with the human follicular infundibulum. Rated at 2, Polyglyceryl-3 Diisostearate exhibits mild surface slip with minimal pore-binding tendencies. Most acne-prone individuals tolerate it in standard cosmetic concentrations.
Formulation Context & The 1% Label Rule
Where Polyglyceryl-3 Diisostearate appears in your product ingredient list matters significantly:
- Top 5 Inactive Ingredients: High concentration (3%–15%+). In leave-on moisturizers and sunscreens, it exerts maximum pore-clogging potential.
- Below Preservatives (<1% Rule): Listed after phenoxyethanol or ethylhexylglycerin, concentration is fractional and less likely to trigger breakouts.
- Rinse-Off Products: In facial cleansers and body washes, brief contact time minimizes follicular retention.
4-Week Patch Testing Protocol
To verify individual tolerance for a formula containing Polyglyceryl-3 Diisostearate:
- Apply a small dab to a 1-inch area of the jawline once daily for four weeks.
- Keep all other skincare products and actives constant.
- Monitor weekly for closed comedones (flesh-colored bumps) or rough texture. Discontinue immediately if congestion develops.
Safer Acne-Safe Alternatives
- Glyceryl Stearate — Comedogenic Rating: 1/5
Frequently Asked Questions
- Can I use Polyglyceryl-3 Diisostearate with active acne?
- Yes, in moderate cosmetic formulations, Polyglyceryl-3 Diisostearate is generally well tolerated alongside active breakout routines.
- Does Polyglyceryl-3 Diisostearate feed fungal acne?
- Many lipids with carbon chain lengths between C12 and C24 can stimulate Malassezia yeast. Use caution if prone to pityrosporum folliculitis.
- How does Polyglyceryl-3 Diisostearate compare to pure Squalane?
- Sugarcane-derived squalane holds an absolute 0/5 rating and does not oxidize in the pore. Compared to Polyglyceryl-3 Diisostearate (Rating: 2), squalane is the preferred baseline for congested skin.