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← All articlesBody contouring in Tarzana means one of five non-surgical device families: radiofrequency, cryolipolysis (fat freezing), high-intensity focused ultrasound, laser lipolysis, and electromagnetic muscle stimulation. They are not interchangeable. Fat freezing, ultrasound and laser aim at a soft pocket of fat; radiofrequency aims at skin laxity and the appearance of cellulite; muscle stimulation aims at muscle tone. The right choice depends on which of those three problems you are actually trying to solve, and no device replaces weight loss or surgery for a large change. This guide explains how each option works, what the published studies measured, how to pick a provider, and where Venus Legacy, the radiofrequency platform we use at our Contour Lounge in Tarzana, fits.
Body contouring is an umbrella term for treatments that change the shape of a small area without surgery. In practice the devices do one of three things:
The American Society of Plastic Surgeons is blunt about the limits. In its patient guidance on non-surgical fat reduction it says the treatments work "for the right patient" but do not compare to liposuction, that their use "should be limited to small, stubborn areas that remain after an adequate diet and exercise program," and that "the actual fat reduction takes place over the course of weeks or months and several treatments may be required." None of these devices moves the number on the scale in any meaningful way. If weight itself is the goal, a GLP-1 weight loss program in Tarzana with provider supervision is the honest first step, and contouring is what you consider afterwards for the areas that stay.
It also helps to know what you are starting with. An InBody body composition scan separates fat mass from muscle and water, so you and the provider can tell whether a stubborn area is fat, loose skin or simply posture, before anyone recommends a device.
Radiofrequency devices pass an alternating current through the skin, which heats the dermis and the fat just beneath it to a controlled temperature while the surface stays cool. The heat triggers collagen remodeling over the following weeks, and in the fat layer it can change the way the tissue is organized. Venus Legacy adds a pulsed magnetic field and, on the body applicators, a gentle suction that moves the tissue under the applicator.
The regulatory wording is worth reading closely because it is more modest than most marketing. In the FDA clearance for the Venus Legacy Pro (K191528, September 2019) the 4D Body and 4D Face applicators are indicated for "relief of minor muscle aches and pain," "temporary improvement of local blood circulation," and "temporary reduction in the appearance of cellulite." The Octipolar and Diamondpolar applicators are indicated for "non-invasive treatment of moderate to severe facial wrinkles and rhytides in Fitzpatrick skin types I-IV." Circumference reduction and skin tightening are what the published studies measure and what patients come in for, but they are not the cleared indication, and a careful provider will say so.
On results, the 2016 review by Alizadeh and colleagues in the International Journal of Endocrinology and Metabolism summarizes radiofrequency studies at roughly 2 to 2.5 centimeters of circumference reduction on the thigh or abdomen, with reductions in fat-to-fascia thickness of about 1.8 to 2.6 millimeters, over courses that ranged from 2 to more than 12 weekly sessions. A 2017 trial in the Journal of Cosmetic and Laser Therapy treated 25 women with eight weekly Venus Legacy sessions on the abdomen and recorded an average 2.6 centimeter circumference reduction one month after the last session, with no adverse effects, though it had no control group. Radiofrequency is the option that addresses skin quality as well as volume, which is why it is the usual recommendation when the complaint is "soft and crepey" rather than "a bulge." We cover the skin side in detail in what Venus Legacy can and can't do for body sculpting and in our guide to cellulite treatment in Tarzana.
Cryolipolysis cools a vacuumed fold of tissue to a temperature at which fat cells are injured and other water-rich cells are not. The body clears the damaged fat cells over two to three months. The Alizadeh review reports fat-layer reductions of about 14 to 25 percent in several studies and a 23 percent decrease in a 518-patient multicenter series, usually after one or two sessions of up to an hour each, with results that depend on having a fold the applicator can grip.
The complication to ask about is paradoxical adipose hyperplasia, where the treated area grows firmer and larger months later and usually needs liposuction to correct. A 2025 systematic review and meta-analysis in Aesthetic Surgery Journal Open Forum (Mah and colleagues, 28 studies, 13,078 patients) put the pooled incidence at 0.22 percent, "notably higher than rates previously reported by manufacturers," which had cited about 0.033 percent. The authors rate the evidence as low certainty and note it is probably still an undercount because the problem appears late. We do not offer cryolipolysis at Club Contour; the full head-to-head is in Venus Legacy vs CoolSculpting.
Focused ultrasound concentrates sound energy at a set depth so the fat there heats above 56 degrees Celsius and undergoes coagulative necrosis while the skin above is spared. The studies in the Alizadeh review report waist reductions of roughly 1 to 4.6 centimeters at 12 weeks, often after a single session, with pain, bruising, swelling, tenderness and occasional hard lumps as the reported side effects. The overall evidence base is small: a 2023 systematic review of HIFU for fat reduction found only 11 studies that met its criteria, nine of them on the abdomen. It is a reasonable option for a defined abdominal bulge when a provider has real experience with the device, and a poor one for skin laxity.
Hyperthermic laser devices use a 1060 nanometer wavelength that fat absorbs preferentially, raising the fat layer to a temperature that injures the cells over a 25-minute treatment while a cooling plate protects the skin. In a 2018 study in the Journal of Drugs in Dermatology (Bass and Doherty), ultrasound measurement showed a mean fat-layer reduction of 1.5 millimeters at six weeks and 2.65 millimeters at twelve weeks after one abdominal treatment. A registered flank study (ClinicalTrials.gov NCT03756168) reported a mean fat thickness change of about 7 percent at week 12 in 27 participants. The changes are real and measurable, and also small; this is a treatment for a specific soft pocket, not a silhouette.
These devices induce supramaximal muscle contractions with a rapidly changing magnetic field, the equivalent of a workout the nervous system could not produce on its own. The most cited study is Kinney and Lozanova in Lasers in Surgery and Medicine (2019): 22 patients, four abdominal treatments, MRI measurement, an average 18.6 percent reduction in fat thickness and a 15.4 percent increase in rectus abdominis thickness, with no adverse events. Two caveats matter. It was a small single-arm pilot with no control group, and the first author is a medical advisor to the manufacturer. The muscle effect is what this category does that no other option does; the fat figure should be read as promising rather than settled.
Match the device to the problem, not the other way round:
Two reviews frame the realistic range. Kennedy and colleagues in the Journal of the European Academy of Dermatology and Venereology (2015) pooled 31 studies and 2,937 patients across laser, cryolipolysis, ultrasound and radiofrequency and concluded that several devices reduce circumference by about 2 centimeters or more on the abdomen, hips and thighs, with no serious or permanent adverse effects reported, while noting that protocols, sites and follow-up varied so much that the devices could not be ranked against each other. The Alizadeh review reached the same place a year later: effects "mild to moderate," typically 2 to 4 centimeters over a full course, little or no effect on body weight or total fat, and long-term durability poorly documented.
On cellulite specifically, the 2015 review by Luebberding, Krueger and Sadick in the American Journal of Clinical Dermatology looked at 67 studies, 19 of them randomized and placebo-controlled, and found no treatment with clear efficacy, with the best signals for acoustic wave therapy and a 1440 nanometer laser. The Alizadeh authors put it plainly: "there is no definitive noninvasive treatment method for cellulite." That is why the FDA wording for Venus Legacy says "temporary reduction in the appearance of cellulite," and why we use the same words.
Two practical points follow. First, measure. A centimeter at the waist is easy to see in a tape measure and easy to miss in a mirror, so ask any provider to measure the same landmarks before and after. Second, hold the result. The devices do not stop new fat storage or the loss of collagen with age; a stable weight, protein, strength work and, for skin, sun protection are what protect the investment. Heat alone from an infrared sauna does not tighten skin in the way radiofrequency does, as we explained in does a sauna tighten skin.
Ventura Boulevard between Encino and Woodland Hills has a dense run of med spas, and most of them offer at least one of the five devices above. The device matters less than how it is used. Questions that separate a careful practice from a sales floor:
At our Contour Lounge on Ventura Boulevard in Tarzana, body contouring means a Venus Legacy series. A first visit is a consultation and screening; our provider reviews the screening before anyone is treated. Sessions run about 30 minutes per area and feel like a warm massage, a sensation we describe honestly in does Venus Legacy hurt. A typical course is a series of weekly sessions, which is the pattern the published studies used; the exact number depends on the area, the skin and the goal, and the thinking behind it is in how many body contouring sessions do you need. There is no downtime, and most people come in on a lunch break. Individual results vary, and we will tell you if we think another approach, or no treatment, is the better answer.
We see clients from across the west San Fernando Valley; if you are coming from a neighboring area, the Encino, Woodland Hills and Sherman Oaks pages cover routes, parking and what to expect. Full details and booking are on the Venus Legacy treatment page.
It depends on the technology. Cryolipolysis, ultrasound and laser are usually one or two sessions per area, with the result developing over two to three months. Radiofrequency devices such as Venus Legacy are delivered as a series of weekly sessions, commonly six to eight in the published trials, with the collagen response continuing for weeks after the last one. Electromagnetic muscle stimulation protocols in the studies used four sessions over two weeks. Your provider should state the number before you start.
Yes, within limits. Pooled reviews of several thousand patients report about 2 to 4 centimeters of circumference reduction over a full course, and fat-layer reductions measured in millimeters, with few serious adverse effects. The effect is real and modest. It does not change body weight, and it will not match liposuction for a large area.
Venus Legacy is radiofrequency: it heats tissue to tighten skin and reduce the appearance of cellulite, delivered as a series of comfortable sessions. CoolSculpting is cryolipolysis: it freezes a pinched fold of fat in one or two longer sessions and does nothing for skin quality. The choice comes down to whether the problem is a fat pocket or skin laxity; our full comparison goes through both in detail.
No. Every review of these devices finds little or no effect on body weight or total body fat. They refine small areas on a stable weight. If weight is the goal, a supervised medical weight loss program comes first and contouring, if wanted, comes after.
Yes. Our Contour Lounge is on Ventura Boulevard in Tarzana, about ten minutes from Encino and Woodland Hills and fifteen from Sherman Oaks, with parking on site. Venus Legacy sessions are booked through the treatment page, and a consultation comes first.
Five device families, three jobs. Freeze, heat or laser a fat pocket; heat the skin with radiofrequency for firmness and cellulite; stimulate muscle for tone. Expect centimeters, not a new body, and judge any provider by the questions they ask before they recommend anything. If skin firmness or cellulite is what bothers you, book a Venus Legacy consultation at our Tarzana Contour Lounge and we will measure, screen and tell you plainly whether it is the right fit.
Sources: American Society of Plastic Surgeons, "Does nonsurgical fat reduction work?"; FDA 510(k) K191528, Venus Legacy Pro indications for use (September 6, 2019); Alizadeh Z et al., Int J Endocrinol Metab 2016;14(4):e36727; Kennedy J et al., J Eur Acad Dermatol Venereol 2015 (31 studies, 2,937 patients); Luebberding S, Krueger N, Sadick NS, Am J Clin Dermatol 2015; Mah AE et al., Aesthet Surg J Open Forum 2025;7:ojaf142; Bass LS, Doherty ST, J Drugs Dermatol 2018;17(1):106-112; ClinicalTrials.gov NCT03756168; Kinney BM, Lozanova P, Lasers Surg Med 2019;51(1):40-46; J Cosmet Laser Ther 2017;19(4):205-209. Reviewed and updated November 2026. Individual results vary; our provider decides what is appropriate after a consultation.