Homosalate vs Butylated Hydroxytoluene: which is worse?
Quick answer: Butylated Hydroxytoluene carries the heavier risk profile. Homosalate is restricted in the EU and allowed in the US; Butylated Hydroxytoluene is — in the EU and — in the US.
| Property | Homosalate | Butylated Hydroxytoluene |
|---|---|---|
| EU status | Restricted | — |
| US status | Allowed | — |
| Risk level | medium | — |
| Banned in | — | Japan (banned for food use) |
| Restricted in | European Union | European Union (ADI-based restrictions), United Kingdom, Australia |
| Category | uv filter | additive |
| Where it hides | sunscreen, SPF moisturizer, SPF foundation | — |
What is Homosalate?
Homosalate is an organic UV filter that absorbs UVB radiation.
What is Butylated Hydroxytoluene?
Butylated hydroxytoluene (BHT) is a synthetic phenolic antioxidant preservative derived from petroleum. A white crystalline solid with formula C15H24O, it prevents fat oxidation in processed foods, cosmetics, and industrial applications. Often used synergistically with BHA.
Documented risks
Homosalate: A suspected endocrine disruptor; the EU limits it to 7.34% in face products (2025), well below typical US concentrations.
Butylated Hydroxytoluene: BHT has complex, bidirectional carcinogenicity data — some NTP bioassays found liver tumors in female mice at high doses, while other studies suggested BHT might inhibit cancer initiation. IARC has not formally classified BHT due to conflicting evidence. A 2017 study linked BHT to thyroid hormone disruption in female rats. The American Academy of Pediatrics (2018) recommended reducing synthetic preservative exposure including BHT in children. Kellogg's uses vitamin E in European versions of cereals that contain BHT in US versions — a commercially meaningful substitution.
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