Calcium Hydroxylapatite: What It Is in Harmonization

Calcium hydroxylapatite (CaHA) is a mineral similar to the inorganic component of bones and teeth. In injectable form, it appears as microspheres suspended in a carrier gel. Right after injection, the gel gives some volume; over time, the carrier is absorbed and the microspheres serve as a scaffold for collagen formation around them.

Because of this dual behavior, it is classified both as a filler and as a collagen biostimulator. When diluted, the volume effect decreases and biostimulation predominates, used for firmness and skin quality over wider areas.

Where is it usually used?

The indications often discussed involve structure and support: jawline, the angle of the jaw, the cheekbone region and the chin. The choice of product, dilution and volume always rests with the qualified professional, after assessment.

What are the main precautions?

The most important difference from hyaluronic acid is that hydroxylapatite is not broken down by hyaluronidase. Excess, irregularity or a nodule cannot be corrected with the enzyme, and a vascular complication calls for different management. That is why thin-skinned and high vascular risk areas are usually avoided or treated with great caution.

As with any injectable, swelling, hematoma, nodules and, more rarely, vascular events can occur. Photographic records before the injection help track progress, since part of the effect shows up only in the following weeks.

Also called: CaHA, hydroxylapatite.