How effective mosquito repellents are depends on the ingredients and application methods. There is some debate about wearable devices like bracelets being ineffective or devices and candles being safer because you’re not applying them to your skin. There are not as strict regulations around potentially dangerous ingredients like DEET in insect repellents, as higher concentrations tend to be more effective despite the health and environmental risks. Wearing clothing covering your skin and using mosquito netting is more effective, but some repellents may still help.