Cryolipolysis (CoolSculpting)

Also known as: CoolSculpting, fat freezing, cryo body contouring

Cryolipolysis cools pinched folds of fat to temperatures that kill fat cells while sparing skin and nerves, and the dead cells clear gradually over 2 to 3 months. Meta-analyses support a real but localized effect: measurable reductions in fat thickness and circumference in treated spots, including about a 2 to 3 mm reduction in under-chin fat, with high satisfaction. It does not cause weight loss and is not an obesity treatment, and buyers should know about paradoxical adipose hyperplasia, an uncommon complication where the treated area grows firm and larger instead of shrinking.

How it works

An applicator suctions a fold of tissue and holds it at roughly minus 10 to minus 11 degrees C for 35 to 60 minutes. Fat cells are more vulnerable to cold injury than skin, so the cooling triggers apoptosis (programmed cell death) in fat cells; the immune system then clears the dead cells over 8 to 12 weeks, thinning the fat layer by roughly 20 percent in the treated zone per cycle.

What the evidence says, claim by claim

These are the results measured in studies, not the results shown in ads. Where the research is weak, the grade says so.

For double chin and submental fat

Moderate evidence

A 2025 systematic review and meta-analysis of 8 studies (206 patients) found cryolipolysis reduced submental fat thickness by a mean of 2.78 mm and volume by about 19.6 cubic centimeters, with transient side effects. An earlier prospective study using 3D imaging measured a 3.77 mm mean fat thickness reduction after 2 cycles, with 93 percent of participants satisfied. The catch: all pooled studies were pre-post designs without sham controls, so the grade stays moderate.

Randomized trials support this use, but they are few, small, or short. The effect is probably real. The size of it is less certain.

Cryolipolysis for Submental Fat Reduction: A Systematic Review and Meta-Analysis (Facial Plastic Surgery, 2025; meta-analysis)
Safety and Efficacy of Bilateral Submental Cryolipolysis With Quantified 3-Dimensional Imaging of Fat Reduction and Skin Tightening (JAMA Facial Plastic Surgery, 2017; clinical-trial)

For skin laxity (tightening claims)

Not enough evidence

Some marketing claims cryolipolysis tightens skin as it removes fat. The support is thin: the 3D imaging study measured a small 1.29 square centimeter reduction in skin surface area alongside fat loss, which is retraction, not a tightening treatment. A 2025 meta-analysis of health outcomes confirmed reduced adiposity measures at 3 months but a relatively high rate of minor adverse events, and no controlled study demonstrates a clinically meaningful laxity benefit. If loose skin is the problem, this is the wrong tool.

The marketing has moved faster than the research. There is no good human data behind this use yet.

Safety and Efficacy of Bilateral Submental Cryolipolysis With Quantified 3-Dimensional Imaging of Fat Reduction and Skin Tightening (JAMA Facial Plastic Surgery, 2017; clinical-trial)
Cryolipolysis and associated health outcomes, adverse events, and satisfaction: A systematic review and meta-analysis (Obesity Reviews, 2025; meta-analysis)

Risks and what can go wrong

No incisions or downtime, but expect numbness, redness, swelling, bruising, and tingling in the treated area for days to weeks, and sometimes significant late-onset pain around days 3 to 7. The signature risk is paradoxical adipose hyperplasia (PAH): the treated area enlarges into a firm mass months later, occurs more often than the originally quoted 1 in 20,000 (more recent estimates run from roughly 1 in 2,000 up to about 1 percent depending on applicator and series), affects men more, and usually requires liposuction to correct. Avoid with cryoglobulinemia, cold agglutinin disease, paroxysmal cold hemoglobinuria, hernia at the site, or pregnancy. Skin-type neutral since no light is involved.

The practical details

One cycle per area takes 35 to 60 minutes; many areas need 1 to 3 cycles, with results assessed at 2 to 3 months. US pricing commonly runs 600 to 1,000 dollars per applicator cycle, so multi-area plans reach 2,000 to 4,000 dollars. In-office only. Fat cells removed are gone, but remaining cells enlarge with weight gain, so results depend on stable weight.