# Fertility clinics offer young mitochondria in controversial technique

Fertility clinics are providing a controversial treatment that involves transferring young mitochondria from donor eggs into older women's eggs to improve fertility. This technique, aimed at addressing age-related infertility, raises ethical concerns about genetic modification and safety. Its growing use underscores the demand for advanced reproductive options despite unanswered questions.

**Importance:** 3/5

## Sources

### Science
- [Nature](https://www.nature.com/articles/d41586-026-01935-5) — 2026-07-28