Clarify is suited for mild and moderate hearing loss, and specifically for what is called age-related high-frequency hearing loss. As people grow older, they tend to lose hearing for high-frequencies (such as a bird chirping) while their low frequencies (say, an engine rumbling) can be heard just fine. As a result, people can hear many sounds of speech – but they have a difficult time distinguishing high-frequency sounds, such as “s”, “z”, “th”, “f”, and others. This makes listening to speech effortful and difficult. People with this very common form of hearing loss report a slightly harder time understanding speech from females and children, who tend to have higher voices.