Radiesse in Daegu: how dilution ratio and injection plane are decided
Search for the best clinic for Radiesse in Daegu and dilution ratio and injection plane come up everywhere. What is rarely written down is how many studies actually compared ratios, and what they found. Here is only what we can verify.
The short version
Radiesse is a calcium hydroxylapatite (CaHA) product, and unlike hyaluronic acid it has no established dissolving agent. So the treatment is decided at the start — by the ratio and the plane — rather than corrected afterwards. But there is no evidence that settles “1:2 is better” or “1:4 is better”. Only two studies compared ratios directly, and both pointed to the less dilute side.
Why dilution is the first word in every conversation
Undiluted Radiesse is microspheres suspended in a gel. Used neat it has real support in a deep plane. Add saline and the same product becomes a material that spreads thinly in a superficial plane.
Dilution is therefore not a way of making the product go further. It is how the plane is chosen. The order runs the other way from how it is usually discussed: the target plane determines the ratio, not the reverse. In consultation, “which plane are you aiming at” is a more precise question than “how many times do you dilute”.
Only two studies compared ratios directly
| Study | Subjects | Finding | How to read it |
|---|---|---|---|
| Human biopsy | Six ratios in one person’s thigh, biopsied at 90 days | Peak total collagen occurred at 1:1 | One subject, and the diluent was 2% lidocaine, not saline |
| Porcine experiment | Animal study with a negative control | Effect was clearer up to 1:3 | Animal data; the layer anatomy is not human |
That is the whole evidence base. And neither study says the more dilute side is better. Hyperdilution is a widely used term, but we could not find a human trial showing hyperdilution outperforms a less dilute preparation.
What tissue studies of diluted CaHA actually showed
One study is not a ratio comparison but does look at tissue. Twenty people received CaHA diluted with preserved saline, with biopsies at baseline, four months and seven months. However, ratios were assigned by skin thickness and results were pooled across all twenty. So this data cannot tell us which ratio performed better.
Figures circulating online such as “collagen increased by X per cent” are usually one frame lifted out of this family of studies. You do not need to arrive at consultation having memorised them.
How far does “more dilute is safer” actually go
A common explanation is that heavy dilution reduces vascular events. Among published cases of CaHA-related ischaemic injury, hyperdiluted product accounted for 3%, and most of those resolved on their own. That is a low figure, and it is real.
But it is a proportion of reported cases, not a comparison of two ratios under the same conditions. We do not know what share of all treatments use hyperdilution — there is no denominator — so 3% cannot be read straight across as “hyperdilution is safer”.
There is also a harder constraint. Cadaveric arterial work has shown that intravascular CaHA is not broken down even when hyaluronidase is used. The emergency pathway relied on for hyaluronic acid fillers does not transfer to this class. That fact defines the product regardless of ratio.
When nodules appear — timing tells you what they are
In pooled CaHA adverse-event data, 89% were nodules and 60% appeared more than a month later. Something palpable straight after treatment is a different thing from something that appears months on. The early kind is usually a non-inflammatory lump where product has pooled in one plane; in an ultrasound study of 27 patients all of them sat within the fascial layer.
This is why “do not place it too superficially” and “do not concentrate it in one spot” recur in this class. However well the ratio is chosen, the same problem follows if the plane is wrong.
Authentic product and correct dose — what can and cannot be checked
In Korea, Radiesse was approved by the MFDS in 2010 for two indications: facial wrinkles and hand volume. The United States later approved the jawline (2022) and décolletage (2026), but those are outside the Korean approval. You should be able to hear that distinction in consultation.
Also, the long number printed on clinic material is usually an advertising pre-review number, not a product licence number. The licence number is on the box under the Medical Devices Act, so you may ask to see the box before treatment. We do that on request.
Summary — what is established and what is not
| Established | Not established |
|---|---|
| Both ratio comparisons pointed to the less dilute side | Whether 1:2 or 1:4 is better |
| A 20-person biopsy study of diluted CaHA (baseline, 4 and 7 months) | Human data reported separately by ratio |
| Hyperdiluted product accounted for 3% of ischaemic cases | Any trial comparing safety between ratios |
| CaHA is not dissolved by hyaluronidase (cadaveric artery) | Any primary study of a reversal agent for this class |
| 89% of adverse events were nodules; 60% after one month | Any difference in nodule rate by ratio |
| Korean approval covers facial wrinkles and hand volume | National adverse-event tallies |
Worth asking in consultation
- Which plane is being targeted — this comes before the ratio.
- What the diluent is — saline, or saline with lidocaine.
- How much goes in at once, and how it is divided — the plan for not pooling in one spot.
- Whether you were told first that it cannot be reversed — the single most important line in this class.
- The box and its licence number — distinguished from the advertising review number.
- The route if something goes wrong — who to contact, and when.
How we judge it at Miso Clinic
Rather than applying Radiesse uniformly to loss of firmness, we assess suitability by looking at skin thickness, the depth of the hollow being treated, and whether the goal is worth the fact that it cannot be reversed.
The ratio follows from the target plane. Laying a thin sheet superficially and supporting a hollow are different jobs, and the same product is used as if it were two different materials. We also err against overcorrection — too little can be added next time, but in this class there is no route to remove what is already in.
Which treatment suits you can differ with skin condition, how much change you want and what you have had before. It is fine to come for consultation and decide later.
Frequently asked questions
What is the best dilution ratio for Radiesse?
The evidence cannot answer that. Only two studies compared ratios directly: a biopsy in one person, where peak total collagen occurred at 1:1, and a porcine experiment with a negative control, where effect was clearer up to 1:3. Both pointed to the less dilute side. The ratio should follow the target plane.
Is hyperdilution safer?
Among published CaHA ischaemic injury cases, hyperdiluted product accounted for 3%, and most resolved on their own. But that is a proportion of reported cases, not a comparison of two ratios under the same conditions. Without a denominator it cannot be read as proof of greater safety.
Why does the plane matter more than the ratio?
Because dilution changes what the product is, not how far it goes. Neat, it supports in a deep plane; diluted, it spreads thinly in a superficial one. The ratio can only be set once the target plane is decided.
Can it be dissolved if there is a problem?
This class has no established dissolving agent. In cadaveric arterial work, intravascular CaHA was not broken down even with hyaluronidase. So before treatment you should be told plainly that it cannot be reversed, and be given the route to follow if a problem arises.
When do nodules appear?
In pooled CaHA adverse-event data, 89% were nodules and 60% appeared more than a month later. The early palpable kind is usually product pooled in one plane; in an ultrasound study of 27 patients all sat within the fascial layer.
Can it be used on the jawline or décolletage?
Those indications were approved in the United States in 2022 and 2026, but the Korean approval covers facial wrinkles and hand volume only. The décolletage approval rested on a multicentre randomised trial of 152 people followed to 84 weeks.
How do I check the product is genuine?
The licence number required under the Medical Devices Act is printed on the box. The long number on clinic material is usually an advertising pre-review number rather than a product licence number. You may ask to see the box before treatment.
Is a cannula better?
The advantage of a cannula was shown for deep-plane injection: in a cadaveric forehead study the intended plane was maintained in 100% of cannula placements against 40% with a needle. Whether the same advantage holds for thin superficial placement has not, as far as we could find, been compared using CaHA.
Further reading
Author and clinic
Dr Lee Chi-Hak, Director, Miso Clinic
4F Bombom Building, 125 Dongdeok-ro, Jung-gu, Daegu (Kyungpook National University Hospital station, exit 1)
+82 53-428-2700 · www.clinicmiso.co.kr
References
- Botsali A, et al. PMID 28831339 (ratio comparison — biopsy in one patient, diluent 2% lidocaine, peak total collagen at 1:1)
- McCarthy AD, Berkowitz S, Chernoff WG. PMID 37399137 (porcine, negative control — effect clearer up to 1:3)
- Yutskovskaya YA, Kogan EA. PMID 36575882 (20 subjects, CaHA diluted with preserved saline, biopsies at baseline, 4 and 7 months; ratios assigned by skin thickness, results pooled)
- Chao YY, Kim JW, Kim J, Ko H, Goldie K. PMID 28095536
- Soares DJ, et al. PMID 42303355 (hyperdiluted product 3% of CaHA ischaemic injury cases — a proportion of reported cases, with no denominator)
- Yankova M, et al. Aesthetic Surgery Journal 2021;41(5):NP226 (intravascular CaHA not dissolved despite hyaluronidase, cadaveric artery)
- Schelke LW, et al. Dermatologic Surgery 2023;49(6):588 (27 patients, non-inflammatory nodules on ultrasound — all within the fascial layer)
- Amiri M, et al. Journal of Clinical Medicine 2024;13(6):1686 (systematic review, 13 controlled studies, 1,171 subjects — authors note risk of bias and heterogeneity preventing pooled analysis)
- Pavicic T, et al. J Drugs Dermatol. 2017;16(9):866 (10 cadavers, forehead, deep plane — intended plane maintained 100% vs 40%. Not a comparison of superficial placement)
- MFDS product licence (2010; facial wrinkles and hand volume) · US FDA approvals 2006, 2015, 2022, 2026 · décolletage approval based on a multicentre randomised trial, 152 subjects, 84 weeks
- Medical Service Act art. 56(2) — restriction on testimonial advertising
What we could not verify
- Whether 1:2 or 1:4 is better — we found no human trial comparing ratios.
- Whether hyperdilution is safer than less dilute preparation under the same conditions.
- Any difference in nodule rate by ratio.
- Any primary study of a reversal agent for CaHA.
- National adverse-event tallies for CaHA in Korea.
- Whether a cannula carries the same advantage in superficial placement, compared using CaHA.
- Any study validating our sequence of letting the plane set the ratio — it is clinical judgement.
Everything in this column is general information and does not replace medical diagnosis or treatment. Effects and side effects vary with individual skin condition, age and underlying illness, and the same result is not guaranteed for everyone. Any decision to proceed should be made in an in-person consultation with a physician.
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