A Startup Says It Grew Human Sperm in a Lab—and Used It to Make Embryos

Paterna says it grew human sperm from testicular tissue in the lab and used it to create embryos in an early safety and viability test.

The company plans larger studies to check safety, genetic integrity, and whether the method could eventually support pregnancy trials.

If successful, lab-grown sperm could offer a new fertility option for men with no sperm and reduce the need for invasive sperm-retrieval surgery.

Experts say the approach could help cancer survivors and others with severe infertility, but it still needs extensive validation.