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Sodium Ascorbyl Phosphate
AKA “66170-10-3, Sodium L-Ascorbyl-2-Phosphate, Sodium ascorbyl monophosphate, Trisodium ascorbate-2-phosphate, 836SJG51DR, l-Ascorbic acid, 2-monophosphate, trisodium salt, DTXSID601014965, RefChem:183786, DTXCID101473302”
Antioxidant
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Ingredient Facts
Sodium ascorbyl phosphate
AKA: 66170-10-3, Sodium L-Ascorbyl-2-Phosphate, Sodium ascorbyl monophosphate, Trisodium ascorbate-2-phosphate, 836SJG51DR, L-Ascorbic acid, 2-monophosphate, Trisodium salt, DTXSID601014965, RefChem:183786, DTXCID101473302
Antioxidant · Antioxidant · EWG: 1
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
See origin →
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
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Phototoxicity Concern
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Final Report on the Safety Assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and Sodium Ascorbyl Phosphate as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
→
Sodium Ascorbyl Phosphate
European Commission
EU Cosmetic Ingredient Database (CosIng)
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Final report of the safety assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and
Elmore AR
International journal of toxicology, 2005
→
Final report of the safety assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and
Elmore AR
International journal of toxicology, 2005
→
Final report of the safety assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and
Elmore AR
International journal of toxicology, 2005
→
Final report of the safety assessment of L-Ascorbic Acid, Calcium Ascorbate, Magnesium Ascorbate, Magnesium Ascorbyl Phosphate, Sodium Ascorbate, and
Elmore AR
International journal of toxicology, 2005
→
Sodium Ascorbyl Phosphate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
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Topical L-ascorbic acid: percutaneous absorption studies.
Pinnell SR, Yang H, Omar M, Monteiro-Riviere N, DeBuys HV et al.
Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.], 2001
→
Topical L-ascorbic acid: percutaneous absorption studies.
Pinnell SR, Yang H, Omar M, Monteiro-Riviere N, DeBuys HV et al.
Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.], 2001
→
Topical L-ascorbic acid: percutaneous absorption studies.
Pinnell SR, Yang H, Omar M, Monteiro-Riviere N, DeBuys HV et al.
Dermatologic surgery : official publication for American Society for Dermatologic Surgery [et al.], 2001
→
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR