Currently, it is not possible to regenerate or grow a completely lost or surgically removed ovary using stem cell therapy. While stem cell research is highly promising, it is still in the experimental stages. Present studies are primarily focused on using stem cells to restore function in damaged or failing ovaries (such as in premature ovarian insufficiency), rather than regrowing an entire missing organ. If you have lost one ovary, the remaining ovary typically compensates to maintain your hormonal balance and fertility. I recommend discussing your specific health and fertility options with a reproductive endocrinologist.