New technologies and medicines make it increasingly possible to enhance human functioning in new ways: to become smarter, more emotionally attuned, and perhaps even morally better. But just because we can use the latest science to improve ourselves, should we? This book has two main aims. First, it outlines and criticises the six main contemporary arguments for scepticism about the role of human enhancements in promoting well-being. These arguments concern, respectively, (i) the value of achievements; (ii) freedom; (iii) hyperagency; (iv) human nature; (v) authenticity and (vi) inequality. It will be shown—for the first time in a book-length treatment—why the overarching bioconservative case against enhancement doesn’t hold water. The se...