What nanofat grafting is, what it treats, and what the evidence shows.

Fat grafting, moving fat from one part of the body to another, has long been used to restore lost volume and correct contour problems.¹ In 2013, Tonnard, Verpaele and colleagues described a way to process fat into a much finer product they called nanofat, fine enough to pass through needles as thin as 27 gauge and be placed directly into the skin.²

Processing changes what the fat is. In their laboratory analysis, the team found no surviving fat cells in nanofat, while stem-like cells from the tissue's supporting framework, the stromal vascular fraction, were still plentiful and grew normally in culture.² Nanofat therefore behaves less like a filler and more like a way of delivering these cells, and the growth factors they release, into the skin.¹

Later laboratory work added nuance. Mechanical emulsification did not reduce the number of stromal cells, but it lowered their viability compared with unprocessed fat while increasing the share of cells carrying progenitor (stem-cell-like) markers.⁴

Nanofat is prepared during the same procedure in which the fat is harvested. Details vary between surgeons and studies, but the core steps are consistent.¹

• Harvest: A small amount of fat is removed by liposuction, most often from the abdomen, with the thighs and flanks as common alternatives.¹
• Emulsification: The fat is passed back and forth between two syringes joined by a narrow connector, typically 20 - 30 times, until it becomes a uniform liquid.^1,3
• Filtration: The emulsion is passed through a fine filter, and an expert consensus places the pore size at roughly 300 - 500 micrometres.³
• Injection: The liquid is placed into or just beneath the skin with a fine needle, often 27 gauge.^2,15

Some protocols add a washing step or centrifugation, and centrifugation settings varied widely between published studies, one of several reasons results are hard to compare.^1,3

Commercial processing kits are not interchangeable. A head-to-head comparison of two mechanical systems found cell yields of 2.24 versus 1.44 million cells per millilitre, even though cell viability was the same, about 96%, in both.⁵

An alternative is to digest the fat with enzymes to isolate the stromal vascular fraction directly. A 2024 systematic review found that enzymatic and mechanical methods produce overlapping ranges of cell yield and viability, but mechanical processing took about 8 - 20 minutes versus 50 - 210 minutes for enzymatic isolation, at lower cost.⁶ Enzymatic isolation also faces stricter regulation, one reason most clinical nanofat is prepared mechanically.¹

Nanofat contains stromal cells, including progenitor cells, which is why it is often described in regenerative terms.^2,4 That is not the same thing as an approved stem cell therapy.

In the United States, the FDA regulates products made from human cells and tissues under 21 CFR Part 1271. How much the tissue has been manipulated, and whether it is used for the same basic function it had in the body, determines how it is regulated.^22,23 The FDA has also warned patients about clinics marketing unapproved stem cell treatments.²⁴ Claims that nanofat regrows tissue or cures disease go beyond what the published evidence shows.

Scars are the best-studied use. Studies have treated burn scars, acne scars, depressed facial scars and surgical scars, generally reporting better pliability, color and overall scar scores.^8-12 Across the 2026 review, patient-rated scar scores (POSAS) fell from an average of 6.7 to 3.9, and Vancouver Scar Scale scores from 8.5 to 5.5.¹ Improvement was not uniform. In one study of facial burn scars, pigmentation and pliability improved markedly while scar thickness and surface relief did not change significantly.⁸

Fine wrinkles and skin quality were nanofat's original purpose.² A trial of 15 patients measured significant reductions in wrinkle depth, area and volume seven months after injection, but had no comparison group.¹⁵ One comparative study found greater improvement in skin texture, and higher satisfaction, with nanofat plus platelet-rich fibrin than with hyaluronic acid filler.¹⁶ The 2026 review concluded that nanofat's effect on facial aging as a stand-alone treatment is less well established, and it is often combined with other treatments.¹

For horizontal neck lines, a related product, SVF-gel, performed similarly to botulinum toxin for mild lines and better for moderate-to-severe lines, although its side effects lasted longer.¹⁷

For hair, nanofat has been used to prepare scar tissue before follicular-unit hair transplantation in scarring hair loss after burns, and transplanted follicles survived at an average rate of 83%.¹⁴ A small study of enzymatically isolated stromal cells, not nanofat itself, in pattern hair loss found higher hair density at 3 and 6 months than on the untreated side, but no significant change in hair thickness.¹⁹

For radiation damage, the evidence comes mainly from grafting purified whole fat rather than nanofat. In a 2007 series of 20 patients with severe late radiation injury, symptoms improved or resolved in all evaluated patients.²⁰ Whether nanofat specifically does the same has not been shown in controlled studies.

For scar prevention, a randomized, double-blind trial injected SVF-gel into one side of fresh breast-reduction incisions, with saline on the other side, and found better scar scores on the treated side at six months.¹⁸ That trial tested SVF-gel, a related product, not classic nanofat.

In the 2026 review, 12 / 18 studies reported no adverse effects. Where side effects were reported they were minor, mostly redness, swelling, bruising and occasional blistering, and resolved within about three weeks. None of the studies reported granulomas, fat necrosis or oil cysts, complications that can occur with conventional fat grafting.¹

• Redness at the injection site is the most common effect. In one study of depressed facial scars, it lasted two to three weeks in 93% of patients.⁹
• Swelling, bruising and mild pain are typical in the first days. In one burn-scar study, redness and crusting faded within about a week.¹
• The fat harvest is itself a small liposuction, with its own soreness at the donor site. One report suggests harvesting from the thigh may be less painful than from the abdomen.¹
• In the neck-line study, side effects lasted longer with SVF-gel than with botulinum toxin.¹⁷

These studies are small and follow patients for months rather than years, so they cannot rule out uncommon or late complications. A safety record built on a few hundred patients is reassuring but not definitive.

• Limited Randomized Evidence: Most studies are case series or before-and-after comparisons without a control group, which makes it hard to know how much of the improvement is due to the treatment itself.^1,3
• Variable Preparation: Harvest sites, centrifugation, emulsification and filtration all vary, and the resulting products differ in cell content.^1,5 Expert consensus definitions are only now emerging.³
• Short Follow-Up: Most studies report results within a year of treatment, so how long improvements last is not well established.¹
• Mixed Products: Some studies grouped under nanofat actually used related products such as SVF-gel or isolated cells, which makes conclusions about nanofat itself less certain.
• Self-Reported Satisfaction: The high satisfaction rates come mostly from studies without a comparison group.¹