INJECTING fat cells into the scalp could stop and even reverse balding, experts say.
Fat has been found to unlock growth stimulants that reduce follicle damage, as well as thickening and strengthening hairs.
The technique could be used to help the millions of men — including Prince William — who suffer pattern baldness before middle age.
It could also assist patients of both sexes whose hair has fallen out for medical reasons, such as the side effects of chemotherapy.
Researchers at the Iran University of Medical Sciences analysed past studies and case reports from doctors who have tried the experimental hair-loss treatment.
Fat cells were harvested from the bellies and legs of 20 male and female liposuction patients.
Around 20ml was then injected under the skin, where they could reduce swelling and cell damage, while encouraging new blood vessels to grow — boosting scalp health.
Study author Dr Azadeh Goodarzi said: “The regenerative cells can secrete various growth factors and induce hair regrowth.
“This can be considered a new and potentially effective treatment method for hair loss and alopecia.”
He added that those involved in the studies experienced “improved hair density and diameter” with only minor side effects such as bruising, swelling and pain.
Steroids and hair transplants can help some hair loss patients, but do not always work and can be costly.
Fat cell injections, meanwhile, have been used in cosmetics for years to help skin look younger.
Writing in the Journal of Cosmetic Dermatology, Dr Goodarzi said: “Fat is a rich source of stem cells, which the body uses to make fresh tissue.”
But he warned: “Further clinical trials are recommended to determine the safety of this treatment.”
