CoolSculpting vs. Zerona
CoolSculpting destroys fat cells, so the change in that area stays. It freezes a pinched fold for 35 to 45 minutes, and most areas need two rounds. Zerona leaves the fat cells in place. A low-level laser is held over the skin for about 20 to 40 minutes, painlessly, and the claim is that fat cells leak some of their contents rather than dying. That is the whole difference: one takes cells away, the other empties them a little and hands them back.
What it does to the fat cell
Cold injures the fat cells inside the applicator. Over the following weeks your body carries the dead cells away.
The stated mechanism is that the cell releases part of its stored fat and stays alive. Your body then has to use or store that fat somewhere.
What it feels like
The cold fades to numbness within about ten minutes. The massage at the end is the part people remember.
Nothing touches you but light. There is no heat, no suction and no discomfort at all.
A session
How many visits
Spaced four to eight weeks apart, then you are done.
Clinics often sell repeat blocks after that.
How long until you see it
Nothing useful shows in the first few weeks.
The change is measured with a tape rather than judged from photographs.
How long it lasts
The cells left behind can still enlarge, so a weight gain will show.
The fat cells are still there and can refill. Results are usually described alongside diet and activity advice.
The main downside
Paradoxical adipose hyperplasia: months later the treated area becomes firmer and larger rather than smaller. It affects about 0.22% of people, roughly 1 in 455, and liposuction corrects it.
Nothing is removed, so nothing is banked. If your habits do not change, there is little reason for the change to hold.
Cost
The at-home or drugstore version
A gel pack starts cold and warms up while you wear it. The clinic device holds one steady temperature for the whole session, and that is what damages the fat cell.
Cheap laser or LED belts put a fraction of the power into the surface. This is a case where the home version is a weaker copy rather than a different idea.
Who each suits
What the measurement actually is
Zerona's headline number is a tape measure: The maker's placebo-controlled trial reported an average loss of about three and a half inches, and that figure is the waist, the hips and the thighs added together.
A tape around a waist includes more than fat: Skin, muscle, gut contents and fluid all sit inside it, and the number moves across a day.
CoolSculpting is judged differently: Its results are usually described as a thinner fat layer under the applicator, seen in photographs taken weeks apart.
So the two numbers do not convert into each other: Inches around three areas and a thinner fat layer at one spot are not the same quantity.
Destroying a cell is not the same as emptying one
A destroyed fat cell does not come back: That is why CoolSculpting results in one area hold, as long as your weight is steady.
An emptied fat cell can refill: Your body does not throw the released fat away. It has to be used, or it is stored again.
That is why the two are sold differently: Freezing is sold as a one-off for a specific bulge. Cold laser is usually sold as part of a programme.
What neither one does
Neither one tightens loose skin: Both leave the skin as they found it.
Neither one is a weight-loss treatment: They change the shape or the measurement of an area. They do not treat obesity.
Neither one replaces what changes your body most: Diet, activity and sleep do the heavy lifting, and both treatments sit on top of that.
Before you book
Ask what a full course costs, and what happens if you want more.
Ask whether a diet or activity plan comes with the Zerona sessions, and what it involves.
Ask to be measured and photographed the same way each time, in the same clothes and light.
For CoolSculpting, ask how many cycles each area needs, not the price of one cycle.
