1.3-Dihydroxyacetone (DHA) is a common cosmetic ingredient primarily used in self-tanning products. 1.3-Dihydroxyacetone is a colorless sugar compound that reacts with amino acids in the skin's surface layer to produce a brownish pigment, mimicking a sun-kissed complexion.

Benefits:

1. Self Tanning Effect: 1.3-Dihydroxyacetone DHA reacts with the keratinocytes in the skin's surface layer to produce a temporary tan without the need for UV exposure.

2. Safe, No UV Damage: Unlike sunbathing or using tanning beds, DHA does not cause UV damage to the skin, reducing the risk of skin cancer and photoaging.

3. Even Skin Tone: Dihydroxyacetone DHA can help conceal skin imperfections and uneven tones, making the skin appear smoother and more uniform.

Uses:

1. Self-Tanning Lotions and Sprays: 1.3-Dihydroxyacetone DHA is the main active ingredient in self-tanning products, widely used in lotions, sprays, gels, and more.

2. Temporary Tanning: Suitable for those who want a temporary tan without sun exposure.

3. Makeup Aid: Used for pre-makeup skin tone adjustment to achieve a more even complexion.

Precautions:

1. Patch Test: 1.3-Dihydroxyacetone is recommended to perform a patch test on a small area of skin, such as the inner arm, before the first use to ensure no allergic reaction occurs.

2. Avoid Eyes and Mucous Membranes: 1.3-Dihydroxyacetone DHA may irritate the eyes and mucous membranes, so care should be taken to avoid these areas during application.

3. Even Application: To achieve an even skin tone, it is advisable to use gloves or application tools and ensure the product is evenly applied to the skin.

4. Temporary Effect: The effect of 1.3-Dihydroxyacetone DHA is temporary, typically lasting 5-7 days, and will gradually fade as the skin naturally exfoliates.