Cyclic phosphate salt. Beyond chelation, it participates in cross-linking of starches and other polysaccharide thickeners – gives the formula a more stable gel structure. More common in cleansers, peel-off masks, scrubs. Safe.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
Functional chelator and cross-linker. Phosphate salt safety confirmed by CIR.
Sodium Trimetaphosphate (STMP, Na3P3O9) is a cyclic phosphate salt. Beyond chelation it participates in cross-linking of starches and polysaccharide thickeners, modifying gel structure. Mechanism. Binds calcium, magnesium and iron ions and prevents their catalytic effect on oxidation. In parallel it cross-links polysaccharides (starch, xanthan gum) and produces a more stable gel texture. Where applied. Face washes, peel-off masks, scrubs, toothpastes (as an antitartar agent). More common in mid-market and mass formulas. Safety. CIR confirmed safety at cosmetic concentrations. Non-sensitizing, non-comedogenic. No systemic absorption. Pregnancy and lactation – safe.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
The Evigrade extension adds an evidence panel to Wildberries, Goldapple, Letu, iHerb, Sephora and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Sodium Trimetaphosphate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Sodium Trimetaphosphate suits: normal, dry, combination, oily, sensitive.
Cyclic phosphate salt.
The INCI name is Sodium Trimetaphosphate. It may also appear as: STMP, Натрия триметафосфат, Na3P3O9.
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