Phosphonic Acid
A chelating agent. It binds metal ions from water so the formula does not spoil or darken. It works at low levels and does not affect skin.
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
Phosphonic Acid is a chelating agent. Its function in a formula is to capture metal ions present in water and raw materials, which otherwise speed up oxidation and darkening of the product. It works at very low levels and protects the stability and color of the formula. The verdict is clear. This is a functional formulation component, not a care active. It does not act on wrinkles, pigment or hydration: its role is to keep the product stable across its shelf life. Its direct effect on skin is nil, and that is as intended. For topical use in pregnancy and breastfeeding it poses no concern at the usual, very low cosmetic concentrations. No meaningful systemic absorption is expected, so it can be used in these stages. Tolerance is good. Low irritation and low allergy potential at use levels. Most people see no reactions.
Frequently asked questions
Is Phosphonic Acid safe during pregnancy?
Phosphonic Acid is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is Phosphonic Acid for?
Phosphonic Acid suits: normal, dry, combination, oily, sensitive.
What is Phosphonic Acid and what does it do in cosmetics?
A chelating agent.
What's the INCI name for Phosphonic Acid?
The INCI name is Phosphonic Acid. It may also appear as: Etidronic Acid.
See Phosphonic Acid in a product composition right on the store page
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Similar role in the formula
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