The first stem cells were obtained from an embryo. If cells are obtained from an embryo it results in its destruction and hence it is considered as unethical in some countries. The other important source for getting stem cells is adult tissue such as bone marrow. The cells obtained from adult tissue do not have the same power as those obtained from an embryo. Stem cells have been obtained from human skin as well.
There is an interesting article that appeared recently where it talked about stem cells found in women's menstrual fluid. It is said that stem cell therapy can treat disorders such as diabetes, cardiac and stroke problems but it has been surrounded amid controversy ever since its inception. Scientists have separated stems cells from the menstrual blood. It is a medium between embryonic and adult tissue stem cells. The stem cells obtained from menstrual blood can be stored and used in future without any fear of rejection by the body. It can also be a possible match for first degree relatives such as siblings, parents and child.

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