Hair procedures, explained without the hype
What the reviews on this site are describing, in plain language: how FUE works, what a society membership means, and how the regenerative adjuncts differ in their evidence.
FUE and micro-FUE basics
Follicular unit excision (FUE) moves hair in its natural groupings of one to four hairs. Each follicular unit is scored with a small cylindrical punch, lifted from the donor zone at the back and sides of the scalp, kept in a holding solution, and placed into tiny recipient sites in the thinning area. "Micro-FUE" describes the same procedure with smaller punches; the aim is a less noticeable donor pattern, not a different biological result.
- Donor supply is finite. The number of grafts that can be moved over a lifetime is limited by donor density, so planning matters more than any single session.
- Graft survival depends on handling. Time out of the body, hydration and the care taken with placement all influence how many grafts take.
- Timeline. Transplanted hairs usually shed within weeks; where regrowth occurs it is assessed over 9–12 months. Standardized photos under the same lighting are the fair way to compare.
- Who does the work. Ask who scores and extracts grafts, who makes recipient sites, and who places grafts; roles differ between clinics.
What ISHRS membership means
The International Society of Hair Restoration Surgery is the field's main professional society. Membership means a physician has joined, agreed to its code of ethics and takes part in its continuing education. It is not a board certification and it does not vouch for any particular result. It does tell you that the physician engages with the specialty's standards. Dr. Charles Pereyra, who reviews the content on this site, is an ISHRS member; his other credentials are listed on his page with sources.
PRP vs exosomes vs Muse-cell adjuncts
PRP (platelet-rich plasma)
Prepared from the patient's own blood and injected into the scalp. Small randomized trials — for example, Gentile et al., 2015, a half-head placebo-controlled study (PubMed 26400925) — report modest increases in hair density in some participants, with variability between people and between protocols. Used off-label; effects, where present, tend to need maintenance sessions.
Exosomes
Extracellular vesicles collected from cultured cells, applied to the scalp as an adjunct. Laboratory and animal data describe signaling that may influence follicle cycling; human evidence for hair consists of small, uncontrolled series. Investigational and not FDA approved. Some reviewers on this site describe exosome-based sessions; their experiences are individual and are not evidence of effect.
Muse-cell adjuncts
Muse cells are a stress-tolerant subpopulation of adult mesenchymal cells described by the Dezawa laboratory (2010). Human studies of Muse-cell products have been in cardiology and neurology research settings with very small numbers of participants; there are no published randomized trials in hair. Any hair use is investigational and should be described that way. Published science context is summarized on stemcellreviewer.com/research.
A fair way to compare the three: PRP has the most human data and the smallest claimed effect; exosome and Muse-cell adjuncts have more biological rationale than clinical evidence. None replaces the medical therapies for pattern hair loss that a physician may discuss, and none is a substitute for an in-person evaluation.
Questions worth asking at a hair consultation
- What is my donor density, and how many grafts does the plan use over my lifetime, not just this session?
- Who performs each step of the procedure, and what is their experience?
- Which adjuncts are proposed, what published human evidence supports each, and what would "no response" look like?
- How will progress be measured — standardized photos, counts, or impressions?
- What are the known side effects and how are they handled?
Frequently asked questions
What is the difference between FUE and micro-FUE?
Both are follicular unit excision: individual follicular units are removed from the donor area with a small punch and placed in the recipient area. 'Micro-FUE' usually refers to smaller punch diameters (under about 0.9 mm) intended to leave less visible dotting in the donor area. The underlying technique is the same, and results depend heavily on donor density, graft handling and the operator.
What does ISHRS membership mean?
The International Society of Hair Restoration Surgery is a professional society; membership indicates a physician has joined and agreed to its ethics code and participates in its education. It is not a board certification and it does not promise any outcome. It is still a useful signal that a physician engages with the field's standards and literature.
Are PRP, exosomes or Muse cells approved for hair loss?
No. PRP is prepared from the patient's own blood and is used off-label for hair loss, with small randomized trials showing modest, variable effects. Exosome and Muse-cell products are investigational for hair; there are no large randomized trials, and they are not FDA approved. Individual responses vary and some people see no change.
How long before a hair procedure shows anything?
After FUE, transplanted hairs commonly shed in the first weeks and regrowth, where it occurs, is typically assessed over 9–12 months. Adjunct procedures are usually assessed over several months with standardized photos. Timelines vary by person; no outcome is promised.
Reviewed for medical accuracy by Dr. Charles Pereyra, MD, Medical Director, Springs Rejuvenation, ISHRS member (bio). Read the hair reviews with this context in mind.
Stem cell and exosome procedures are investigational. The studies discussed on these pages are early, mostly small, and individual responses vary. Nothing here is medical advice; please consult a licensed physician about your own situation.