Dihydroxyacetone

What is Dihydroxyacetone?

Dihydroxyacetone, known as DHA, is a simple three-carbon ketose sugar obtained from natural sources like sugarcane and beets, existing as a white crystalline powder. In cosmetics, it primarily features in self-tanning lotions, sprays, mousses, and bronzers within the color cosmetics category. Functionally, DHA undergoes a Maillard reaction with amino groups in keratin proteins of the stratum corneum, the skin's dead outer layer, forming brown melanoidin pigments that develop a tan-like color within hours. This surface-level interaction fades with natural skin shedding. Beyond tanning, it acts as a colorant for uniform shades in makeup, aids skin conditioning by promoting smoothness, and serves as a reducing agent in select hair formulations. Regulatory bodies such as the FDA recognize it as a safe color additive for external skin use, with applications limited to rinse-off and leave-on products.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1-3 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Colorant
Provides or corrects color using dyes or pigments, helping achieve a consistent shade and visual appearance across batches and throughout wear.
Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
Reducing agent
Causes reduction reactions, often used in hair perming.
Tanning
Creates a tanned appearance (commonly via DHA reaction with skin proteins) or enhances perceived warmth of tone in self-tanners and bronzing products.

Benefits

Creates a natural-looking bronze tone without sun exposure.

Enhances skin smoothness and flexibility as a conditioning agent.

Offers consistent color in self-tanners and bronzers for even application.

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 preferring UV-free options for a tanned appearance.
Those with highly sensitive skin prone to reactions.
Individuals seeking non-comedogenic colorants for daily skincare.
People with skin conditions affecting the outer layer.
Users wanting temporary warmth to skin tone in cosmetics.
Individuals experiencing allergic responses to sugar derivatives.

Safety Notes

  • EWG rates it low hazard (1-3), indicating minimal risk.
  • Approved for cosmetic use by FDA as a skin color additive.

Frequently Asked Questions about Dihydroxyacetone

What does dihydroxyacetone do in products?

It reacts with skin surface proteins to produce a temporary tan color in self-tanners.

Is dihydroxyacetone safe for skin?

Yes, it's low hazard per EWG and approved by regulators for external use.

Does dihydroxyacetone clog pores?

No, it has a comedogenic rating of 0, suitable for acne-prone skin.