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Quick answer: Padimate O carries the heavier risk profile. Homosalate is restricted in the EU and allowed in the US; Padimate O is allowed in the EU and allowed in the US.
| Property | Homosalate | Padimate O |
|---|---|---|
| EU status | Restricted | Allowed |
| US status | Allowed | Allowed |
| Risk level | medium | low |
| Banned in | — | — |
| Restricted in | European Union | — |
| Category | uv filter | uv filter |
| Where it hides | sunscreen, SPF moisturizer, SPF foundation | Some older-formulation Coppertone products, Banana Boat Sport Performance SPF |
Homosalate is an organic UV filter that absorbs UVB radiation.
Padimate O (octyl dimethyl PABA) is an oil-soluble UVB-absorbing UV filter derived from PABA (para-aminobenzoic acid). It was once one of the most common UVB filters in US sunscreens but has declined in use since the 1990s.
Homosalate: A suspected endocrine disruptor; the EU limits it to 7.34% in face products (2025), well below typical US concentrations.
Padimate O: Padimate O is FDA-approved at up to 8%. It is a PABA derivative and carries a rare risk of photoallergic contact dermatitis in individuals sensitive to PABA-related compounds. There are some in vitro studies suggesting potential DNA damage from padimate O under UV exposure, though this has not been substantiated in human studies at cosmetic use levels. The CIR has assessed it as safe. Its use has largely been replaced by more modern, better-tolerated filters.
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