he roots of hair loss run deep: It’s linked to hormonal balance, immune response, stem cell signaling, and now, according to new research from University of California, Los Angeles — metabolism.

The study, published in Nature Cell Biology, finds that the metabolism in the stem cells embedded in hair follicles is different from surrounding cells. When they tinkered with that metabolic pathway in mice, they could either halt hair growth — or make it proliferate. The UCLA researchers are now testing out a duo of drugs to try and prompt that hair to grow.

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