Sodium Ascorbyl Phosphate
AKA: 66170-10-3, Sodium L-Ascorbyl-2-Phosphate, Sodium ascorbyl monophosphate, Trisodium ascorbate-2-phosphate, L-Ascorbic acid, 2-monophosphate, Trisodium salt
Synthetic
Antioxidant
Vitamin C
Clean
L-Ascorbic acid, 2-(dihydrogen phosphate), trisodium salt
Formula
C6H6Na3O9P
Mol. Weight
322.05
CAS #
66170-10-3
Form
Powder
Functions
Antioxidant
Fights free radicals — the unstable molecules from UV, pollution, and stress that break down collagen and cause premature aging.
Neutralizes Free Radicals
Traditional Use
A derivative of vitamin C created in the 1980s-1990s as a stable, water-soluble form for cosmetics. Developed to provide vitamin C's antioxidant and collagen-supporting effects while remaining shelf-stable in skincare formulations.
Skin Types
●all-skin-types
Best For
Dullness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed3 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
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Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR