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Blood cells traveling through a vessel.

Over the course of seven years, Sezenia Tzeni endured seven rounds of in vitro fertilization. Typically, women undergo only three or four IVF treatments before either getting pregnant or giving up. But for Tzeni and her husband, conceiving a child was more important than almost anything else.

“My mother and friends told me to do an adoption,” 36-year-old Tzeni told Gizmodo. “But I wanted to feel it, to feel the feeling of pregnancy and the moving in my belly.”

Each time, though, the cycle of hope and disappointment became more devastating. After the seventh round, finally, she stopped trying.

Then, in 2015, a friend told Tzeni, who lives on a small island in Greece, about a clinic in Athens called Genesis. There, a gynecologist named Konstantinos Sfakianoudis claimed to have found a way to rejuvenate aging ovaries with a blood treatment typically used for healing wounds. So far, Sfakianoudis says, the technique has helped nine women nearing menopause who were having difficulty conceiving to get pregnant via IVF. In pre-clinical trial data provided by Sfakianoudis, 11 of 27...