What is a major ethical disadvantage of using embryonic stem cells?

Using embryonic stem cells raises significant ethical concerns, primarily because it involves the destruction of human embryos. Many people believe that life begins at conception, and thus, creating and using embryos solely for research purposes can be viewed as taking away a potential life. This ethical stance can lead to considerable debate surrounding the moral implications of embryo use for scientific advancement.

The concern stems from varying beliefs about when life and personhood begin, making this a sensitive subject that affects public opinion and policy regarding stem cell research. The debate often centers on the balance between potential healing benefits offered by embryonic stem cells and the moral status of the embryos that must be sacrificed to obtain these cells. This issue is central to discussions around bioethics and has implications for both scientific research and legislation.