Is Sodium Ascorbyl Phosphate Comedogenic? (Rating: 0/5)
Reviewed by Vanessa A. (Formulation Researcher) · Clinical assay verified
Comedogenic Rating: 0 (Non-Comedogenic)
Stable water-soluble vitamin C derivative; non-comedogenic and useful for acne-prone skin.
Ingredient Specifications
| Specification | Clinical Value |
|---|---|
| Comedogenic Scale Rating | 0 / 5 (0 (Non-Comedogenic)) |
| Cosmetic Category | vitamin |
| Known INCI / Aliases | sodium ascorbyl phosphate, sap |
| Follicular Occlusion Risk | Negligible / Non-Comedogenic — acne safe |
Mechanism in Sebaceous Follicles
Cosmetic ingredients interact directly with the human follicular infundibulum. Rated at 0 out of 5, Sodium Ascorbyl Phosphate is bio-compatible and non-occlusive. It does not induce hyperkeratosis or promote bacterial proliferation inside the pore.
Formulation Context & The 1% Label Rule
Where Sodium Ascorbyl Phosphate 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 Sodium Ascorbyl Phosphate:
- 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.
Frequently Asked Questions
- Can I use Sodium Ascorbyl Phosphate with active acne?
- Yes, in moderate cosmetic formulations, Sodium Ascorbyl Phosphate is generally well tolerated alongside active breakout routines.
- Does Sodium Ascorbyl Phosphate feed fungal acne?
- Non-lipid ingredients in the vitamin category generally do not exacerbate Malassezia folliculitis.
- How does Sodium Ascorbyl Phosphate compare to pure Squalane?
- Sugarcane-derived squalane holds an absolute 0/5 rating and does not oxidize in the pore. Compared to Sodium Ascorbyl Phosphate (Rating: 0), squalane is the preferred baseline for congested skin.