Great question! Our patches are 100% drug-free, which means they're a totally natural way to get effective relief without any side effects.
Here's the science behind them – they rely on an exothermic reaction within the pouch to emit heat. When the ingredients (iron powder, carbon and salt) inside the pouch come into contact with air, a reaction is triggered and heat will be emitted. All this magic happens within 5 minutes, and the patches steadily warm up to provide effective relief in 12 minutes.