Sodium Metaphosphate
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.
Supporting ingredient
It gives a product its texture, stability or shelf life. It has no claimed effect on the skin, so an efficacy tier does not apply. What is known about its safety is below
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
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.
Frequently asked questions
Is Sodium Metaphosphate safe during pregnancy?
Sodium Metaphosphate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Sodium Metaphosphate for?
Sodium Metaphosphate suits: normal, dry, combination, oily, sensitive.
What is Sodium Metaphosphate and what does it do in cosmetics?
Inorganic phosphate salt.
What's the INCI name for Sodium Metaphosphate?
The INCI name is Sodium Metaphosphate. It may also appear as: (NaPO3)n.
See Sodium Metaphosphate in a product composition right on the store page
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Similar role in the formula
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