Hyaluronic Acid Types and Hardness Selection Guide — Complete Filler Guide by Treatment Area
"Just use hyaluronic acid"—Multiple clinical reports have indicated that errors in formulation selection or injection site judgment can lead to serious complication risks.
There are dozens of filler formulations available. Some are firm, some are soft, some spread, and some stay in place.
If the formulation properties are mismatched with the injection site, the risk extends beyond unnatural-looking results to potential adverse tissue effects.
Intra-vascular injection errors, particularly at high-risk sites such as the glabella, nose, and periorbital area, have been reported to result in blindness and tissue necrosis.
Formulation selection criteria cannot be separated from the anatomical characteristics of each treatment area.
What you will learn in this article:
- Scientific criteria for hyaluronic acid filler "hardness (viscosity, elasticity, and cohesivity)" and selection
- Optimal filler properties and injection approaches required for each treatment area (particularly the nose and under-eye region)
- Latest injection techniques for enhancing safety and essential knowledge for avoiding complications
"It's just a minor procedure, so it's safe"—This misconception has led to post-procedure complications in some cases.
Certainly, hyaluronic acid is convenient. Downtime is minimal, and if needed, it can be dissolved with hyaluronidase.
However, "which formulation, at which depth, in what volume"—Multiple clinical reports demonstrate that errors in these choices carry the risk of residual tissue changes even after dissolution treatment.
For those considering clinic selection and procedure content, based on the latest clinical research, we explain filler selection criteria for each treatment area with evidence-based guidance.
If you find yourself thinking "What about my case?"
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About the author of this article
Hiromitsu NakamuraPhysician, Ginza Clinic
Zetith Beauty Clinic Ginza, Osaka, and Fukuoka Locations
With a track record of research presentations at domestic and international academic conferences, he is involved in technical guidance and education across all Zetith Beauty Clinic locations. Specializing in precision aesthetic medicine based on anatomical foundations, he pursues natural results tailored to each patient's bone structure and tissue characteristics.