Shark oil has been used for centuries for medicinal and cosmetic purposes. However, due to the cruel and unsustainable practices of shark hunting, alternative sources are needed. Synonyms for shark oil include squalane, a derivative of shark liver oil that can now be sourced from plants such as olives, as well as squalene, a similar compound found in plants and animals such as sharks. Other alternatives include fish oil and plant-based oils such as rosehip and argan oil, which offer similar benefits for the skin and hair. The use of sustainable and cruelty-free sources of these oils is crucial for the preservation of marine life and the environment.