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PEG-25-PABA: UV Filter in Sunscreen

PEG-25-PABA is a synthetic UV filter used in sunscreen and cosmetic products. It absorbs UV-B radiation, helping to protect the skin from sun-related damage.

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Things worth knowing about "PEG-25-PABA"

PEG-25-PABA is a synthetic UV filter used in sunscreen and cosmetic products. It absorbs UV-B radiation, helping to protect the skin from sun-related damage.

What is PEG-25-PABA?

PEG-25-PABA is a synthetic chemical UV filter used in sunscreens and cosmetic products. It is a polyethylene glycol derivative of para-aminobenzoic acid (PABA). The PEG modification significantly improves its water solubility and skin tolerability compared to unmodified PABA. PEG-25-PABA is approved as a UV filter in cosmetic products within the European Union and primarily absorbs UV-B radiation in the wavelength range of 280 to 320 nanometers.

Mechanism of Action

PEG-25-PABA functions as a chemical UV filter. The molecule absorbs high-energy UV-B radiation and converts it into heat energy before it can penetrate skin cells and cause DNA damage. The polyethylene glycol chain of 25 units attached to the PABA core enhances the water solubility and formulation compatibility of the ingredient, making it suitable for a wide range of cosmetic applications.

Use in Cosmetic Products

PEG-25-PABA is commonly found in the following product types:

Sunscreen creams and lotions
After-sun products
Daily moisturizers with SPF
Decorative cosmetics with UV protection

According to the EU Cosmetics Regulation (EC) No. 1223/2009, PEG-25-PABA is listed as an approved UV filter with a maximum permitted concentration of 10% in finished cosmetic products (Annex VI, Entry No. 3).

Safety and Tolerability

Although PEG-25-PABA is better tolerated than unmodified PABA, sensitive individuals may experience skin reactions. Possible adverse effects include:

Contact allergy or allergic contact dermatitis
Photoallergy (light-induced allergic reactions)
Skin irritation in individuals with sensitive skin

Individuals with a known PABA allergy or hypersensitivity to sulfonamides or other para-amino compounds should avoid products containing PEG-25-PABA and consider alternative UV filters. A patch test before first use is recommended for sensitive skin types.

Regulatory Status

Within the European Union, PEG-25-PABA is listed as an approved UV filter under the EU Cosmetics Regulation. In other regions, such as the United States, the use of PABA derivatives in sunscreens is subject to different regulatory frameworks and may be restricted. The European Chemicals Agency (ECHA) and the Scientific Committee on Consumer Safety (SCCS) regularly assess the safety of cosmetic ingredients, including UV filters such as PEG-25-PABA.

References

European Commission: Regulation (EC) No. 1223/2009 of the European Parliament and of the Council on cosmetic products, Annex VI – List of UV filters allowed in cosmetic products.
Scientific Committee on Consumer Safety (SCCS): Opinion on UV-filters in cosmetic products. SCCS/1611/19, European Commission, 2021.
Shaath, N. A.: Ultraviolet Filters. Photochemistry and Photobiology, 86(5), 981–994, 2010. DOI: 10.1111/j.1751-1097.2010.00737.x

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