The photoaging challenges faced by cosmetic formulations primarily fall into two categories: damage to skin and hair caused by light, and degradation of the formulation itself due to light exposure. Ultraviolet rays can lead to sunburn, photoaging, and hyperpigmentation, while also causing photodegradation of certain ingredients in formulations. This results in reduced protection, altered scents, color shifts, or unstable textures. Therefore, in sunscreen products and broader personal care systems, photostability considerations and the selection of UV filters are indispensable components that determine a product's efficacy and user experience.

For sunscreens prioritizing broad-spectrum protection, stability, and excellent skin feel, an effective UV filtration system must cover key UVA and UVB wavelengths while maintaining stability under sunlight exposure to prevent rapid degradation of protection over time. By leveraging the characteristics of oil-phase or water-phase systems and rationally configuring sunscreens, formulations can enhance the overall durability of SPF and PA protection while optimizing solubility and film-forming properties. This reduces whitening, pilling, and greasiness, achieving both high-level protection and a comfortable experience.

In hair care and cleansing products, sunlight accelerates hair fading, dryness, and breakage—particularly affecting chemically treated or damaged hair. Integrating photoprotection into serums, sprays, shampoos, and conditioners helps reduce UV damage to keratin and pigments, minimizes cuticle roughness and dullness, and prolongs smoothness and shine. For sensitive individuals and frequent daily use, formulation mildness, stability, and odor control are equally crucial.

Color cosmetics prioritize color and finish stability. UV exposure can cause oxidation and discoloration in pigments, dyes, or oil systems, affecting both application appearance and shelf life. Selecting appropriate light protection and anti-photo-degradation strategies enhances shade consistency and wear performance while reducing yellowing or graying issues. Perfumes and fragrances exhibit heightened light sensitivity, with certain ingredients reacting to light exposure to cause scent shifts or color darkening. Implementing light protection strategies at both the formulation and packaging levels helps preserve fragrance structure and aesthetic quality, ensuring the “first-day-out-of-the-bottle” scent is retained for longer.