Skin

Fillers and collagen stimulators after GLP-1 weight loss: what the first studies show

By Juvenate Editorial Published November 2, 2026 Last updated November 2, 2026

If your face has started to look a little hollower as the weight comes off, you are far from alone, and the beauty industry has noticed. In late October, Reuters reported that Galderma, L’Oréal and Natura are all testing treatments for people on GLP-1 medicines. Meanwhile, the first studies of in-office treatments for “Ozempic face” are starting to appear. Here is a friendly, plain-language look at what fillers and collagen stimulators are, what the early research really shows, and the questions worth asking before you book anything.

This is not medical advice and not a recommendation to have, or to avoid, any procedure. Fillers are medical procedures. Talk with your doctor or prescriber about your weight-loss plan, and with a board-certified dermatologist or plastic surgeon about your face. No affiliate links. Disclosure.

First, a quick refresher on “Ozempic face”

“Ozempic face” is a nickname, not a diagnosis. It usually describes flatter cheeks, hollows under the eyes or at the temples, a sharper jaw and skin that sits a little looser after significant weight loss. Our post on Ozempic face and skin changes explains why it happens.

The short version: experts think it is mostly about losing fat quickly, not about the medicine doing something special to your skin. As King’s College London dermatologist Beibei Du-Harpur told Reuters, “The drug doesn’t melt your collagen.” Age plays a part too. GLP-1 medicines are used most widely by adults aged 50 to 64, the same years when collagen and, for many women, estrogen are already declining.

Why a cream can only do so much

Good skincare still matters. Sunscreen, a retinoid if your dermatologist agrees, gentle moisturizers and topical peptide products can help the surface of your skin look smoother and more even. (Our guides to copper peptides and peptides, explained cover what topicals can do.)

But the volume that goes missing lives deeper, in the fat layer under the skin. Experts quoted by Reuters said skincare can improve the look of the skin but cannot fully replace that lost volume or reposition the deep fat pads of the face. That is why people start asking about in-office treatments.

The main in-office options, explained

Hyaluronic acid (HA) fillers. HA is a gel-like substance your body makes naturally. HA fillers add volume right away. The American Academy of Dermatology (AAD) says they typically last about 4 to 12 months. The FDA notes that fillers made from materials other than hyaluronic acid can be harder, or even impossible, to remove.

Collagen stimulators (also called biostimulators). These include poly-L-lactic acid (PLLA) and calcium hydroxylapatite. Instead of simply filling, they are designed to prompt your own body to build collagen over time. The AAD notes that PLLA results appear over a few weeks and can last 1 to 3 years, and that it usually needs a short course of gentle at-home massage afterward.

Other options. Energy-based tightening devices, your own fat (fat grafting) and surgery are also used for facial changes after weight loss. Our loose neck and jawline skin guide covers tightening and lifts.

What the first GLP-1 studies found

The most detailed study so far was published in the Aesthetic Surgery Journal. Researchers followed 41 adults (39 women, average age about 59) who had lost an average of about 34 pounds on a GLP-1 medicine and had kept their weight stable before starting. Each person had a series of PLLA treatments in the lower face plus HA filler in the cheeks, then was followed for nine months.

By the end, 88.6% said they looked better than before treatment, 85.7% said their face looked less sunken and gaunt, and 91.4% said they would recommend it. The researchers also measured improvements in skin hydration and radiance, and reported no treatment-related adverse events.

That sounds encouraging, and it is a useful first look. But there are some important caveats:

There was no comparison group. Everyone got the treatment, so we cannot tell how much of the change came from the treatment versus time or expectations.
It was funded by the maker. Galderma, the company behind the products tested, sponsored the study, and several authors work there.
It was small. Six people did not finish the study.

An independent systematic review published in Aesthetic Plastic Surgery in October looked for every study of treatments for GLP-1-related facial changes. It found just four, with 98 treated people in total, and none had a control group. They covered injectable fillers and biostimulators, a radiofrequency device and a topical cream. All reported favorable results, but the authors concluded the evidence is “preliminary and insufficient” to say which treatment works best, or in what order. They also noted that three of the four studies had funding links to the product makers.

So the honest answer today is: these treatments may help some people feel more like themselves, but the science specific to GLP-1 users is still very early.

Timing: why many experts suggest waiting

Your face keeps changing while you are still losing weight. The Galderma study only enrolled people whose weight was already stable. The systematic review suggested that during active weight loss, a more conservative or staged approach may make sense, with bigger decisions discussed once weight has stabilized. It also stressed that there is no validated rule yet for how long to wait.

If you are still losing, that is a good reason to start with skincare, protein and a steady pace, and to talk with your prescriber about how fast the weight is coming off. Our protein on a GLP-1 guide explains why eating enough still matters.

The safety side: what the FDA wants you to know

Fillers are FDA-regulated medical devices, and the FDA is clear that getting them is a medical procedure, not a casual beauty treatment. Common side effects include bruising, redness, swelling and tenderness, which usually settle within days to weeks. Less common problems include lumps, infection and allergic reactions.

The most serious risk is filler accidentally entering a blood vessel. The FDA says this is unlikely, but it can cause tissue damage, vision problems including blindness, or stroke. The FDA also notes that it has not approved fillers for injection around the eyes, a common area of concern after weight loss, so ask your provider directly about the risks and approvals for any area you want treated.

The FDA and the AAD both recommend:

Choosing a licensed, experienced provider, ideally a board-certified dermatologist or plastic surgeon.
Never having filler injected at a salon, party or someone’s home.
Never buying filler online or trying to inject yourself.
Asking to see the patient labeling for the exact product being used.
Getting medical help right away for unusual pain, vision changes, or skin that turns white, gray or blue near the treated area.

The AAD also says conservative treatment tends to look more natural, which is reassuring if you are worried about looking “done.”

Questions to bring to your consultation

Is my weight stable enough for this, and how might future weight changes affect the result?
Is my main concern volume, loose skin, or skin quality, and which approach fits that?
Which product would you use, is it FDA-approved for this area, and may I see the labeling?
How many sessions do you expect, how long might results last, and what is the total cost?
How often do you treat this area, and what is your plan if a complication happens?

It is also worth telling your prescriber you are considering a cosmetic procedure, and telling your injector which medicines you take.

Gentle steps you can take today

Protect your skin. Daily sunscreen is still the best-studied anti-aging habit. Our new sunscreen filter post explains why.
Feed your skin and muscles. Protein and a balanced plate support you through weight loss.
Be patient with yourself. Your face is still adjusting while your weight changes, so give it time before making big decisions.

For a simple, printable plan for your skin, hair and strength while you lose weight, sign up for our free GLP-1 Glow-Up Guide.

The bottom line

Fillers and collagen stimulators can restore some lost facial volume, and the first small studies in GLP-1 users are encouraging. But those studies had no comparison groups, some were funded by manufacturers, and no treatment can stop the natural aging process. If you are curious, start with a stable weight, a board-certified provider and realistic expectations. And remember, there is no rush. Choosing to do nothing at all is a perfectly good choice too.

Find more skin guides on our Skin page and more GLP-1 guides on our GLP-1 page.