Sunscreen Filters: Organic (Chemical)
Carbon-based UV filters that absorb UVA and UVB rays; sheer and easy to wear, and usually combined for broad-spectrum protection.
chemical sunscreen, chemical SPF, organic UV filters, chemical UV filters, avobenzone, butyl methoxydibenzoylmethane, octinoxate, ethylhexyl methoxycinnamate, octisalate, ethylhexyl salicylate, homosalate, octocrylene, oxybenzone, benzophenone-3, bemotrizinol, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate, ensulizole, phenylbenzimidazole sulfonic acid
Sun protection · Ageing skin · Pigmentation & dark spots · All skin types
What it does
Organic filters, often called chemical filters, are the carbon-based UV filters used in most modern sunscreens. They absorb the sun's UVA and UVB rays before they can reach the living layers of the skin. UV exposure causes sunburn and premature ageing and is a major cause of skin cancer, so daily sun protection matters, with sunscreen as one part of it. Because each filter covers only part of the UV spectrum, formulas usually combine several to give broad-spectrum protection, and they tend to feel sheer, blend easily and leave no white cast.
How it works
Organic filters absorb UV energy and release it as a small amount of heat, so less UV reaches the skin's living cells. No sunscreen blocks all UV, and some filters, such as avobenzone, break down in sunlight unless the formula stabilises them. Whatever the filter type, sunscreen needs a little time to settle into an even film, so apply it generously before going outdoors, as the label directs, and let it set before makeup. Reapply at least every two hours outdoors, and after swimming, sweating or towelling, and use sunscreen alongside shade, hats, sunglasses and protective clothing.
MG says
Topping up SPF over a full face of makeup isn't easy: a generous dusting of SPF powder helps, but treat it as a bonus, as a full reapplication is always the safest option. For your morning application, Auteur's Definitive Sun Drops combine UVA and UVB protection with antioxidants in a completely transparent, non-greasy formula, the perfect final step whatever the weather.
Cautions
Some organic filters can sting the eyes or irritate sensitive skin, and a few, such as oxybenzone and octocrylene, occasionally cause allergic reactions, so patch test if you react easily. Small amounts of some organic filters are absorbed into the body; regulators continue to review the data, and some markets have set lower limits for a few filters as a precaution. Sun protection matters in pregnancy and while breastfeeding, and MG's Notes favour mineral filters then; if you're pregnant, trying to conceive or breastfeeding, check with your doctor, midwife or pharmacist about which to use. Sunscreen is not a reason to stay in the sun longer.
Regional notes
Australia: Sunscreens whose main purpose is sun protection, and moisturisers with SPF above 15, are therapeutic goods regulated by the TGA (look for AUST L on the pack), and their filters must come from the TGA's permitted list. The TGA has proposed lower limits for homosalate and oxybenzone, with an interim decision due for consultation by the end of 2026.
United States: Sunscreens are over-the-counter drugs regulated by the FDA, which permits fewer filters than Australia or the UK: bemotrizinol was added only in June 2026, and filters such as bisoctrizole, DHHB and ethylhexyl triazone aren't permitted. Labels may show SPF values above 50, while AU and UK labels stop at 50+.
United Kingdom: Sunscreens are cosmetics: filters must come from the UK's permitted list, labels stop at SPF 50+, and a UVA circle logo shows UVA protection of at least a third of the SPF. The UK has set lower oxybenzone limits from January 2026 and banned 4-MBC from July 2026, but hasn't adopted the EU's lower homosalate limit.
