Radiesse: the best-evidenced product in our booster cabinet

Calcium hydroxylapatite belongs to the same mineral family as human bone and tooth — a material the body already recognises, formed into microscopic spheres and suspended in gel.

Stage 1 — what the gel does immediately

The carrier gel occupies space at the injection site. The effect resembles a filler, and it is temporary.

Stage 2 — the gel is absorbed

Over some weeks the gel resorbs and part of the initial fullness goes with it. This is the stage patients most often read as failure, when it is in fact the point at which the real mechanism begins.

Stage 3 — what the microspheres do

Cells are recruited around the remaining particles and new collagen is laid down. Histology describes type III collagen rising first and type I increasing later, with elastin increasing alongside. The microspheres biodegrade over one to two years.

To be accurate about the limits: the precise pathway has not been fully established. A foreign-body response to the particles and calcium-ion signalling have both been proposed, and reviews of the field state plainly that supporting evidence remains incomplete.

Much of what you will read about Radiesse online reflects United States approvals, which differ from the Korean licence. The distinction matters, so here it is explicitly.

In Korea the licence covers facial wrinkles and dorsal hand volume. This page is written to that scope.

The hand indication is worth dwelling on. Hands show age early and there is relatively little that treats them well. Radiesse holds a formal Korean indication for restoring dorsal hand volume, and that is part of why this clinic stocks it alongside the other five.

That the effect is durable and that it cannot be removed are the same property seen from two sides. Particles remain and keep working, which is why it lasts — and why it cannot be undone.

A hyaluronic acid filler can be dissolved with hyaluronidase. CaHA has no equivalent. Hyaluronidase does not dissolve it, and sodium thiosulfate, once proposed as an alternative, showed no dissolution effect in later work. The measures used when a nodule appears — saline injection with massage, intralesional treatment, laser, ultimately surgical removal — disperse or extract the material; they do not dissolve it.

• Do not overcorrect. Too little can be added to later; too much cannot be taken back
• Do not place it superficially. Superficial placement is the commonest reason a nodule becomes visible
• Avoid the sites where nodules cluster. We do not treat lips or the tear trough with CaHA
• Do not try to finish in one sitting. Build in stages and review

The microspheres do biodegrade over one to two years, so time resolves most things — but it is better not to spend that time unhappy.

Here Radiesse differs from the other boosters: the trials behind the regulatory approvals actually exist and are public.

The 2006 FDA approval rested on a randomised split-face study of 117 patients — comparing the two sides of the same face, against a control filler, in the nasolabial folds. The 2015 hand indication and the 2026 décolleté indication each required their own trials; the décolleté study followed 152 patients to 84 weeks in a multicentre randomised design.

Tissue-level findings have been reproduced too: compared against hyaluronic acid filler, treated sites showed higher type I collagen staining at nine months.

For balance: a 2024 systematic review of thirteen controlled studies (1,171 patients) concluded that they carry risk of bias and vary enough between themselves that pooled analysis was not possible. Reported duration also varies widely — twelve to thirty months across studies. The instructions for use put established safety and effectiveness at three years for the face and one year for the hands.

A fair summary: the best-evidenced product in this category, but not one where anyone can promise you a number of months.

Miso Clinic stocks two CaHA products, Radiesse and DCLASSY. They are the same class, and the real difference is the volume of evidence behind each.

Everything described above belongs to Radiesse. DCLASSY holds a Korean licence as a tissue-repair material, but no clinical trial data specific to it is publicly available, and no published comparison of the two products' microsphere concentration or gel composition exists. So there is no basis for ranking them — only the plain fact that far more data has accumulated on the Radiesse side.

We stock both to have a choice, decided by site, objective, and what the patient values.

DCLASSY reference →  ·  Six boosters compared →

Reasonable candidates

• Thinning skin combined with a clear loss of firmness
• Gentle hollowing of the cheeks or temples that casts shadow
• Loss of volume on the backs of the hands, with tendons and veins standing out — a licensed indication in Korea
• Patients who want to see some change straight away
• Patients who prefer the better-evidenced option

Where Radiesse is the wrong choice

• Lips — safety not established and nodules reported; we do not treat lips with CaHA
• Tear trough — a site where nodules cluster
• Pigmentation, redness, pore size, acne scarring — not what CaHA treats
• Deep dynamic lines — botulinum toxin territory
• Precise contour sculpting — irreversibility makes fine adjustment unwise; HA filler is the right tool
• Pregnancy or breastfeeding, under 18, active infection at the site, bleeding disorders, history of severe allergy, autoimmune or granulomatous disease

The consultation begins by separating hollowing from loss of firmness. If Radiesse is appropriate, site, volume and depth follow — and because the material cannot be reversed, we spend longer on this step.

Topical anaesthetic is applied, then the product is placed by cannula or needle into the deep dermis or subdermal plane. Superficial placement is avoided on principle, and volume is distributed rather than deposited in one spot. On the hands the product goes into the plane between tendons and veins by cannula and is then smoothed evenly.

Immediately post-treatment the gel makes the result look slightly fuller than it will finally be; that settles over some weeks. We account for this by deliberately placing less at the outset.

Swelling and bruising can last somewhat longer than with other boosters. Allow at least a week before anything important. After hand treatment, avoid heavy use of the hands for a few days.

• Do not press or rub the treated area yourself — product can be displaced
• Avoid sauna, jjimjilbang, strenuous exercise and alcohol on the day
• Use sun protection diligently
• If something palpable remains, or one side stands proud, come back rather than waiting

This reference was written and reviewed by Dr. Lee Chi-Hak, director of Miso Clinic in Daegu, South Korea. The clinic stocks six collagen boosters and skin boosters with genuinely different active materials — liquid PCL (GOURI), PN (Rejuran), hADM (Re2O, CellREDM) and CaHA (Radiesse, DCLASSY) — and selects between them according to which kind of ageing the face is actually showing. A clinic holding one product will use that product. See our comparison of all six and the references on liquid PCL, polynucleotide, hADM, CellREDM and DCLASSY.