Steroids: they're infamous for their use in sports. But they're also found in inhalers, creams to treat poison ivy and eczema, and shots to ease inflammation. The steroids in these medicines aren't the same as those used to build muscle. In fact, they're all based on yet another steroid— one our body produces naturally, and we can't live without. Anees Bahji explores the science of corticosteroids. [Directed by Nick Hilditch, narrated by Addison Anderson, music by Audionetwork].