By 2018, some 76,000 women in the U.S. will freeze their eggs every year to preserve their fertility and increase their odds of getting pregnant later in life. Yet egg freezing is by no means a solid insurance policy. Some estimates suggest that just under 24% of procedures will result in a live birth. The fertility field is looking for other options.

In a new study published in the journal Reproductive Sciences, two fertility experts argue that ovarian tissue freezing—a procedure that removes and freezes ovarian tissue for later use—could offer an alternative, especially for women who can’t undergo egg freezing for medical reasons.

Read more at Time.