Calcium Hydroxylapatite Filler

What is it?

Calcium hydroxylapatite (CaHA) is a filler material given as microspheres suspended in a gel carrier. It is a compound that is also found in bone tissue. Once injected it behaves in two stages: the carrier gel provides volume at first, and the microspheres stimulate the tissue's own collagen production.

No product name appears on this page; what is described is the active substance.

CaHA is an injectable product made by suspending calcium hydroxylapatite microspheres in a carrier gel. It differs from hyaluronic acid fillers in two respects. The first is how it works: hyaluronic acid gives volume directly and only, whereas with CaHA the carrier gel is absorbed over time and the remaining microspheres stimulate collagen production in the surrounding tissue. This is why CaHA is classed not as a "volume filler" but as a biostimulator. The second is reversal: hyaluronic acid can be dissolved with the enzyme hyaluronidase, but no such enzyme exists for CaHA. If you are not happy with the result, in most cases there is no option other than waiting. These two differences directly determine which patient the treatment is suitable for: for someone who wants an immediate and reversible change, CaHA is not the right choice. For the same reason the choice of treatment area calls for more care; thin-skinned areas and the lip are not considered suitable for this substance.

How does it work, and when is the result visible?

The fullness seen immediately after treatment belongs largely to the carrier gel. This gel is absorbed over a number of weeks, and during that period the appearance may recede somewhat. The actual effect emerges as the collagen response stimulated by the microspheres develops over time. In practical terms, what you see in the first days is not the final result, and this is not a result that is "clear on the same day" as it is with hyaluronic acid fillers. It takes patience.

1. Treatment: the gel containing the microspheres is placed in the target layer.
2. Early period: the fullness you see belongs largely to the carrier gel.
3. Transition: the carrier gel is absorbed; the appearance may recede during this period.
4. Collagen response: the tissue response stimulated by the microspheres develops over time and determines the actual result.

Animated Explainer

Treatment Areas

• Cheekbone area — structural support
• Chin and jawline — contour support
• Back of the hand — appearance caused by volume loss
• Not possible: the lip — this substance is not considered suitable for the lip
• Not possible: thin-skinned, superficial areas — because of the risk of nodules
• Not possible: an expectation of an immediate and reversible result

Procedure Steps

1. Assessment

   The goal, skin thickness and the timing of your expectations are discussed. If you are expecting an immediate result, you are told at this stage that this treatment is not suitable.

2. Information on irreversibility

   It is explained clearly that the treatment cannot be dissolved with hyaluronidase. This is the most important point to know before deciding.

3. Preparation

   The area is cleaned with antiseptic; a topical anaesthetic is applied if needed.

4. Treatment

   The product is placed at the appropriate depth and in controlled amounts; superficial placement is avoided.

5. Follow-up

   The result is assessed over a period of weeks. No decision is made on the basis of the early appearance.

Duration and Longevity

How long the effect lasts varies with the person, the area treated and the degree of the collagen response. Because the duration ranges reported in the literature vary with the person and the area treated, an individual assessment is made at the examination. Independently of duration, this is what you need to know: the effect fading does not mean the gel can be dissolved. Irreversibility is a separate property from longevity, and a more important one.

Who is it suitable for?

• Adults aged 18 and over
• People aiming for structural support who accept that the result settles over time
• People who come knowing and accepting that the treatment cannot be reversed
• People being assessed for areas that need support, such as the cheekbones or the jawline
• People expecting a realistic and limited change

Who is it not suitable for?

• People expecting an immediate result — the effect appears over time
• People expecting reversibility — hyaluronidase has no effect on this substance
• People considering treatment of the lip — this substance is not considered suitable for the lip
• People looking for a solution for thin-skinned, superficial areas — risk of nodules
• Pregnant and breastfeeding people, people with an active skin infection, and people with a bleeding disorder or taking blood thinners (physician assessment required)
• People who are undecided: with a treatment that cannot be reversed, indecision is in itself a reason to postpone; starting with hyaluronic acid and seeing the result may be a safer route.

Aftercare

• Do not press on or massage the area in the first days.
• For the first 24 to 48 hours avoid alcohol and any blood-thinning medicines your physician has not approved.
• Stay away from hot environments and strenuous exercise in the first days.
• Wait several weeks before judging the result; the early appearance is not final.
• Keep using sunscreen.
• If pain increases, the skin blanches or a colour change spreads, contact the clinic without waiting.

Possible Side Effects

• Temporary swelling, redness and bruising
• The appearance receding in the early period — due to absorption of the carrier gel
• Palpable firmness or nodules — reported particularly with superficial placement
• Asymmetry — options for correcting it are more limited than with hyaluronic acid fillers
• Rare but serious: tissue damage caused by the gel blocking a blood vessel. The absence of an enzyme to reverse the treatment makes this harder to manage than with hyaluronic acid fillers.

Frequently Asked Questions