Inorganic phosphate salt. Acts as a chelator – binds calcium and magnesium ions, preventing them from precipitating in the formula and softening hard water. Also stabilizes pH. In skincare rarely exceeds 1%, safe.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
Functional chelator and buffer. Phosphate salt safety confirmed by CIR.
Sodium Metaphosphate ((NaPO3)n) is an inorganic linear phosphate salt. In cosmetics it serves as a chelator and pH buffer. Formula concentration rarely exceeds 1%. Mechanism. Binds free calcium, magnesium and heavy-metal ions (iron, copper) that enter the formula via water and raw materials. Without a chelator these ions catalyse oxidation of sensitive actives (vit C, retinoids, oils) and precipitate anionic surfactants. It also stabilises pH. Where applied. Cleansers, shampoos, toothpastes, creams with photolabile actives. Sits near the bottom of the INCI list. Safety. CIR confirmed safety at cosmetic concentrations. Non-sensitizing, non-comedogenic. No systemic absorption through intact skin. 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 Metaphosphate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Sodium Metaphosphate suits: normal, dry, combination, oily, sensitive.
Inorganic phosphate salt.
The INCI name is Sodium Metaphosphate. It may also appear as: Натрия метафосфат, (NaPO3)n.
Published: · updated: