The use of embryo stem cells can be considered unethical because it is required to use fetal tissues for this technique.
Stem cells are pluripotent cells that have the ability to divide and differentiate in potentially any human tissue.
The use of embryo stem cells can be considered unethical for a part of society because this technique requires the destruction of fetal (human) tissues.
Some of the disadvantages of the use of stem cells in medical settings include the risk of infections, possible bleeding, graft-based diseases, etc.
An alternative to these techniques (stem cell-based methods) can be regeneration in vivo of the damaged tissue.
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