What is hyperdilute Radiesse?

The same product reconstituted with far more diluent and spread thinly over an area, so it acts as a collagen stimulator rather than a volumiser. It is sold everywhere for skin quality, neck, décolletage and body — and both 2024 systematic reviews say plainly that despite the trend, the guidelines and the safety record, no randomised controlled trials have been published for diluted and hyperdiluted use.

So is hyperdilute Radiesse a bad idea?

Not necessarily. It means the claim rests on consensus and clinical practice rather than trials, and you should price it accordingly. What you should not accept is a specific percentage improvement figure, because there is no randomised evidence to produce one.

Can Radiesse be dissolved?

No. A 2026 review states it directly: "CaHA is not dissolvable with any readily available enzyme such as hyaluronidase for HA fillers." Hyaluronidase is sometimes still used in an emergency, to address any hyaluronic acid in the same area or to improve tissue permeability — not to remove the CaHA.

Radiesse or hyaluronic acid filler?

The trade-off is durability against reversibility. Radiesse lasts longer and adds a collagen response; hyaluronic acid can be dissolved if you dislike it or if something goes wrong. On complications, four randomised nasolabial trials found no significant difference between the two for nodules or haematoma — so the decision is not about which is safer in ordinary use, it is about what happens when it isn't ordinary.

Where is it actually licensed?

The 2024 review of body use notes the only FDA-approved body indication is the hands, with a European approval for the décolletage. Neck, arms, thighs and abdomen are off-label uses. In South Korea, look the product up on the MFDS device portal under its Korean name.

What should I ask a clinic?

Whether they are injecting it at standard concentration or hyperdiluted, and for what. Where exactly, and whether that site is on-label. What happens if there is a problem, given nothing dissolves it. And the Korean product name, so you can check the licence yourself.

Treatments · also called 레디어스, 래디어스, CaHA

Radiesse: what is licensed, what is hyperdiluted, and what cannot be undone

Radiesse fills and stimulates collagen, and no enzyme dissolves it. The hyperdiluted version sold as a skin booster has no randomised trials behind it.

Author: Aesthetics Korea Editorial Team
Medical review: Reviewed by 2 doctorsSee methodology
Published: 8 September 2026
Last updated: 8 September 2026
Last reviewed: —5 min read

Short answer

Radiesse is calcium hydroxylapatite microspheres in a gel carrier — it corrects on the day and stimulates collagen afterwards. For its licensed uses on cheeks, jawline and nasolabial folds, a 2024 systematic review rates it safe and effective. The heavily marketed hyperdiluted version, spread thin for "skin quality", has no randomised trials at all. And unlike hyaluronic acid filler, no enzyme dissolves it.

Key facts

What it is: Calcium hydroxylapatite microspheres suspended in carboxymethylcellulose gel (CaHA/CMC)
Two effects: Immediate correction from the gel, then collagen stimulation as the microspheres remain
Supported uses: Cheeks, jawline, nasolabial folds, HIV-related facial lipoatrophy; hands is the approved body site
Hyperdilute version: Widely used for skin tightening — and no randomised controlled trials have been published
Reversibility: None. "CaHA is not dissolvable with any readily available enzyme"
Against HA filler: No significant difference in nodules or haematoma across four randomised nasolabial trials

What it is

Calcium hydroxylapatite microspheres suspended in a carboxymethylcellulose gel. The gel gives correction on the day. The microspheres stay behind and provoke a collagen response over the following months, then break down.

That dual action is the selling point, and it is real. It also means Radiesse sits awkwardly between two categories — part filler, part collagen stimulator — and the two versions sold in Seoul are almost different treatments.

The licensed version, and the evidence for it

A 2024 systematic review in the International Journal of Dermatology assessed CaHA/CMC across facial uses and found it "may be considered a safe and effective treatment option for cheeks, jawline, HIV-related facial lipoatrophy, and nasolabial folds", with marionette lines, chin, pre-jowl and corner of the mouth also responding well.

On the body, the companion review notes the only FDA-approved body indication is the hands, with a European approval for the décolletage.

That is a reasonable evidence base for a contour product.

The hyperdiluted version, and the evidence for it

Here is the gap worth knowing before a consultation in Seoul.

Hyperdilute Radiesse — the same product reconstituted with much more diluent and spread thinly — is marketed everywhere for skin quality, tightening, neck, décolletage, arms, thighs and abdomen.

Both 2024 reviews land on the same sentence. The face review: "Despite the recent trend, guidelines, and safety profile of diluted and hyperdiluted Radiesse, no randomized controlled trials have been published." The body review: hyperdilutions on neck, feet, arms, thighs and abdomen "have yet to be supported by randomized controlled trials".

Note the tension inside that second abstract, because it is characteristic of this whole area: the authors describe a skin-tightening effect as established in practice and say randomised trials do not support it. Both statements are in the same paragraph. What that means for you is that the claim rests on consensus and clinical experience, not on trial data — which is a legitimate basis for a treatment, and not a basis for a percentage figure.

If a clinic quotes you a specific improvement number for hyperdilute Radiesse, ask where it comes from.

Nothing dissolves it

This is the practical difference from hyaluronic acid filler, and it should weigh more than either evidence base.

A 2026 review of filler complications puts it plainly: "CaHA is not dissolvable with any readily available enzyme such as hyaluronidase for HA fillers." In vascular occlusion — the emergency that makes reversibility matter — "no enzymatic agent can dissolve CaHA microspheres", although some consensus guidelines still describe hyaluronidase in the area, to address any hyaluronic acid also present or to improve tissue permeability.

So the hyaluronic acid reassurance does not transfer. A result you dislike is waited out.

How it compares with hyaluronic acid filler

In ordinary use, the complication profiles are close. A meta-analysis of four randomised nasolabial trials found no significant difference between CaHA and hyaluronic acid for nodules (RR 0.18; 95% CI 0.01–6.62) or haematoma (RR 0.24; 95% CI 0.01–4.31). Those confidence intervals are very wide, so read it as "no difference detected in small trials" rather than as proof of equivalence.

The real separation is not in the common case:

	Radiesse (CaHA)	Hyaluronic acid filler
Onset	Immediate, plus collagen over months	Immediate
Duration	Longer	Shorter
Reversible	No	Yes, with hyaluronidase
Evidence for standard use	Systematic review support	Extensive
Evidence for diluted "skin" use	No randomised trials	Separate question

What to ask at a consultation

Standard concentration or hyperdiluted? These are different treatments with different evidence, and the answer should be volunteered.
Which site, and is it on-label? Hands is the approved body site; neck, arms and abdomen are not.
What happens if there is a problem? Nothing dissolves it, so the answer should be a real plan.
What exactly are you expecting to change, and when?
Korean product name, so you can check the device licence yourself.

The bottom line

Radiesse corrects immediately and stimulates collagen afterwards, and for cheeks, jawline and nasolabial folds a 2024 systematic review supports it as safe and effective. The hyperdiluted version sold for skin quality and body tightening is supported by consensus and practice, not by randomised trials — both 2024 reviews say so explicitly. And unlike hyaluronic acid filler, no enzyme dissolves it, which should make a first treatment conservative and the choice of injector matter more than the brand.

Frequently asked questions

What is hyperdilute Radiesse?: The same product reconstituted with far more diluent and spread thinly over an area, so it acts as a collagen stimulator rather than a volumiser. It is sold everywhere for skin quality, neck, décolletage and body — and both 2024 systematic reviews say plainly that despite the trend, the guidelines and the safety record, no randomised controlled trials have been published for diluted and hyperdiluted use.
So is hyperdilute Radiesse a bad idea?: Not necessarily. It means the claim rests on consensus and clinical practice rather than trials, and you should price it accordingly. What you should not accept is a specific percentage improvement figure, because there is no randomised evidence to produce one.
Can Radiesse be dissolved?: No. A 2026 review states it directly: "CaHA is not dissolvable with any readily available enzyme such as hyaluronidase for HA fillers." Hyaluronidase is sometimes still used in an emergency, to address any hyaluronic acid in the same area or to improve tissue permeability — not to remove the CaHA.
Radiesse or hyaluronic acid filler?: The trade-off is durability against reversibility. Radiesse lasts longer and adds a collagen response; hyaluronic acid can be dissolved if you dislike it or if something goes wrong. On complications, four randomised nasolabial trials found no significant difference between the two for nodules or haematoma — so the decision is not about which is safer in ordinary use, it is about what happens when it isn't ordinary.
Where is it actually licensed?: The 2024 review of body use notes the only FDA-approved body indication is the hands, with a European approval for the décolletage. Neck, arms, thighs and abdomen are off-label uses. In South Korea, look the product up on the MFDS device portal under its Korean name.
What should I ask a clinic?: Whether they are injecting it at standard concentration or hyperdiluted, and for what. Where exactly, and whether that site is on-label. What happens if there is a problem, given nothing dissolves it. And the Korean product name, so you can check the licence yourself.

Medical evidence

Systematic review2024
A systematic review of Radiesse/calcium hydroxylapatite and carboxymethylcellulose: evidence and recommendations for treatment of the face
"CaHA/CMC may be considered a safe and effective treatment option for cheeks, jawline, HIV-related facial lipoatrophy, and nasolabial folds… Despite the recent trend, guidelines, and safety profile of diluted and hyperdiluted Radiesse, no randomized controlled trials have been published."
Other2026
Complications of Hyaluronic Acid and Calcium Hydroxylapatite Fillers — A Comprehensive Narrative Review
"One major difference is that CaHA is not dissolvable with any readily available enzyme such as hyaluronidase for HA fillers." For vascular occlusion, "no enzymatic agent can dissolve CaHA microspheres", though consensus guidelines still describe hyaluronidase use to address any hyaluronic acid present or improve tissue permeability.

Sources

Listed in the order they are used. Source class follows the methodology.

1.A systematic review of Radiesse/calcium hydroxylapatite and carboxymethylcellulose: evidence and recommendations for treatment of the face, International Journal of Dermatology, 2024Peer-reviewed researchaccessed 2026-09-08Systematic review of CaHA/CMC for facial use. Rates it safe and effective for cheeks, jawline, HIV-related facial lipoatrophy and nasolabial folds, with marionette lines, chin, pre-jowl and corner of the mouth also responding well. States that no randomised controlled trials have been published for diluted and hyperdiluted use.
2.A systematic review of Radiesse (calcium hydroxylapatite): evidence and recommendations for the body, International Journal of Dermatology, 2024Peer-reviewed researchaccessed 2026-09-08The only FDA-approved body indication is the hands, with a European Union Medical Device Regulation approval for the décolletage. Hyperdilutions on neck, feet, arms, thighs and abdomen are described as providing a skin-tightening effect, while the same abstract states that diluted and hyperdiluted use has "yet to be supported by randomized controlled trials".
3.Complications of Hyaluronic Acid and Calcium Hydroxylapatite Fillers — A Comprehensive Narrative Review of Clinical Presentation and Current Management Strategies, Journal of Cosmetic Dermatology, 2026Peer-reviewed researchaccessed 2026-09-08States that CaHA is not dissolvable with any readily available enzyme, and that no enzymatic agent can dissolve CaHA microspheres in vascular occlusion — while noting some consensus guidelines still describe hyaluronidase in the affected area for any concomitant hyaluronic acid or to improve tissue permeability.
4.Complications from Nasolabial Fold Injection of Calcium Hydroxylapatite for Facial Soft-Tissue Augmentation: A Systematic Review and Meta-Analysis, Aesthetic Surgery Journal, 2016Peer-reviewed researchaccessed 2026-09-08Four randomised trials of nasolabial fold injection. No significant difference between CaHA and hyaluronic acid for haematoma (RR 0.24; 95% CI 0.01–4.31) or nodules (RR 0.18; 95% CI 0.01–6.62). Adding lidocaine had no significant effect on oedema, erythema, ecchymosis, pain or pruritus.
5.의료기기 안심책방 (MFDS medical device information portal), Ministry of Food and Drug SafetyGovernment / public bodyaccessed 2026-09-08Where the Korean licence for the product is looked up under its Korean name.

Concerns it addresses

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