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Quick answer: 4-Methylbenzylidene camphor carries the heavier risk profile. 4-Methylbenzylidene camphor is banned in the EU and allowed in the US; Padimate O is allowed in the EU and allowed in the US.
| Property | 4-Methylbenzylidene camphor | Padimate O |
|---|---|---|
| EU status | Banned | Allowed |
| US status | Allowed | Allowed |
| Risk level | high | low |
| Banned in | European Union | — |
| Restricted in | — | — |
| Category | uv filter | uv filter |
| Where it hides | sunscreen, SPF cosmetics | Some older-formulation Coppertone products, Banana Boat Sport Performance SPF |
4-Methylbenzylidene camphor is an organic UVB filter (4-MBC).
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.
4-Methylbenzylidene camphor: A confirmed endocrine disruptor; effectively banned in the EU and not approved in the US.
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 Its use has largely been replaced by more modern, better-tolerated filters.
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