Hydroxyapatite

Benefits
UV Protection

What is Hydroxyapatite?

Hydroxyapatite is a naturally occurring calcium phosphate mineral with the formula Ca₁₀(PO₄)₆(OH)₂, forming the primary inorganic component of human bones and tooth enamel. In cosmetics, it appears as a fine white powder, synthetically produced for purity and consistency to match biological forms. Commonly featured in facial scrubs, toothpastes, and creams, it functions through its hard, crystalline particles for physical polishing without harshness. As an abrasive, it buffs away dull surface layers; as a bulking agent, it adds volume and smooths application; in emulsions, it reinforces stability by interacting at oil-water interfaces. Its biocompatibility allows remineralization support in oral products and subtle light reflection for visual softening in skin formulas, making it versatile across cleansers, masks, and whitening agents.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Abrasive
Provides gentle mechanical exfoliation and polishing, helping remove surface dead skin cells and improve smoothness and slip in scrubs and cleansers.
Bulking agent
Increases mass/volume to build structure and improve handling, commonly used to adjust feel, spread, and cost-in-use without acting as a primary active.
Oral care agent
Supports oral hygiene performance (cleaning, freshening, plaque control, sensitivity support) in toothpaste, mouthwash, and related products.
Emulsion stabilizer
Improves emulsion robustness by preventing droplet coalescence and phase separation, often by thickening, structuring, or strengthening the interfacial layer.

Benefits

Offers gentle mechanical exfoliation to smooth texture.

Provides minor UV scattering for surface protection.

Supports product stability and oral hygiene enhancement.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
People seeking mild physical exfoliants for daily polish.
Those with rare calcium phosphate mineral sensitivities.
Individuals wanting biocompatible bulking for creamier textures.
People preferring chemical-free exfoliation methods.
Users of oral care products needing enamel-like remineralization support.
Individuals avoiding particulate ingredients in eye-area products.

Safety Notes

  • Rated low hazard by safety assessments for cosmetic use.
  • Non-comedogenic, unlikely to clog pores.

Frequently Asked Questions about Hydroxyapatite

What is hydroxyapatite in cosmetics?

A calcium phosphate mineral powder used for exfoliation, bulking, and stability in skincare and oral products.

Is hydroxyapatite safe for skin?

Yes, it has a low safety rating and is non-irritating for most users in typical formulations.

Does it help with UV protection?

It offers light surface UV scattering due to its particle properties.