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Ingredient dictionary

Etidronic Acid

Also listed as: HEDP

Etidronic acid is a chelating agent, meaning it grabs onto metal ions like calcium and iron so they cannot affect a formula. Its main job is keeping products stable. It is on the label of 1 product in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Etidronic Acid does

  • Binds metal ions in water
  • Supports preservatives and antioxidants
  • Keeps color and scent stable

Etidronic acid is made in a chemical plant from phosphorus-based starting materials and acetic acid, the acid found in vinegar. It is a small molecule with several acid groups that can grab onto metal ions. Formulators use it because metal ions in water or raw materials can cause trouble, such as color shifts, odor changes, and preservatives that work less well.

Body lotions are water-based and can sit on shelves for a long time, so keeping them stable matters. Etidronic acid is used in small amounts and adds little scent, color, or feel. It dissolves easily in water, and because it is acidic, formulators check that the final pH still suits the product.

Good for

Suits most people; it is a background ingredient that works in the formula rather than on the skin.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is etidronic acid safe in skincare?

It is used at low levels in cosmetics and is generally well tolerated. As with any ingredient, people with very sensitive skin can patch test a new product first.

Why is etidronic acid in my body lotion?

It helps the lotion stay stable by binding metal ions that can come from water or raw materials. This helps the color and scent stay consistent over the life of the bottle.

Products with Etidronic Acid

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