Monosodium Citrate
AKA “Sodium dihydrogen citrate, Sodium citrate monobasic, 3-Propanetricarboxylic acid, monosodium salt, sodium salt (1:1), E 331I, RefChem:159615”
Synthetic
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Ingredient Facts
Monosodium citrate
AKA: Sodium dihydrogen citrate, Sodium citrate monobasic, 3-Propanetricarboxylic acid, Monosodium salt, Sodium salt (1:1), E 331I, RefChem:159615
Synthetic · Buffering | Chelating | pH Adjusting | Skin Conditioning - Humectant · EWG: 4
Plant-Derived
Humectant
Chelating Agent
Skin Conditioner
Chemical Exfoliant
Synthetic
Clean
Helps balance the pH of the formula to keep it stable and gentle on skin.
Formula
C6H7NaO7
Mol. Weight
214.10
CAS #
18996-35-5
Form
Liquid
Plant-Derived
Synthetic. Derived from citric acid, a weak organic acid typically produced from corn or sugarcane through fermentation. Synthesized by neutralizing citric acid with sodium hydroxide or sodium carbonate to form the monosodium salt.
Function
Buffering | Chelating | pH Adjusting | Skin Conditioning - Humectant
Benefits
Buffering
Antioxidant
Anti-Inflammatory
Boosts Collagen
Maintains optimal pH
Traditional Use
Citric acid salts have been used since antiquity—citrus fruits were valued in traditional medicine and skincare for their astringent and brightening properties. The monosodium form was developed in the 20th century as a pH buffer and chelating agent.
Skin Types
all-skin-types
Best For
Target
General
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR