The term covers a family of regenerative treatments rather than one procedure. In practice it means preparing a concentrate of your own biological material — adipose-derived cells from a small fat sample, micrografted follicular tissue from a tiny punch of scalp, or platelet-rich plasma from your own blood — and delivering it into the scalp to support follicle function.
The rationale is sound. Hair follicles are among the most metabolically active structures in the body, and they depend on growth factors and blood supply. Regenerative preparations concentrate those signals. In miniaturising follicles that are still alive but producing progressively finer hair, that support can measurably improve calibre and reduce shedding.
What it cannot do is create a follicle where none remains. Once a follicle has fully fibrosed, no injection currently available will bring it back — which is why we position this as an adjunct. Used around surgery it supports graft survival and speeds recovery. Used in early thinning it helps protect what you still have. Used as a replacement for a transplant, it disappoints.