Ingredients by brand
What's in Thermacell repellents?
The 6 Thermacell products we've scored use 2 different active ingredients: Metofluthrin and Allethrin.
By the Notch Wellness team · Updated July 22, 2026 · Reviewed against our scoring methodology
We make Notch, so we're not a neutral third party. Ingredients and concentrations come from each product's label; scores come from our published methodology.
Active ingredients in Thermacell products
Metofluthrin 5.5%
In 4 of 6 products
Metofluthrin is a synthetic pyrethroid used as the active vapor in modern battery- and heat-powered spatial repellent devices such as the Thermacell E-series and EX-series and the OFF! Clip-On. It is not applied to…
Allethrin 21.97%
In 2 of 6 products
EPA Substance Registry Services (SRS) listed active ingredient for pesticide products.
Every Thermacellproduct we've scored
Open a product for its full ingredient list, protection time and review.
| Product | Active ingredient | Mosquito protection | Our score |
|---|---|---|---|
| Thermacell Backpacker Mosquito RepellerSpatial Device | Allethrin 21.97% | — | 74 |
| Thermacell E55 Rechargeable Mosquito RepellerSpatial Device | Metofluthrin 5.5% | — | 82 |
| Thermacell E90 Rechargeable Mosquito RepellerSpatial Device | Metofluthrin 5.5% | — | 82 |
| Thermacell EX90 Rechargeable Mosquito RepellerSpatial Device | Metofluthrin 5.5% | — | 83 |
| Thermacell Patio Shield MR300 Mosquito RepellerSpatial Device | Allethrin 21.97% | — | 74 |
| Thermacell Radius Zone Rechargeable Mosquito RepellerSpatial Device | Metofluthrin 5.5% | — | 78 |