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2024 · 3 min read
Understanding Your Injectable Options
· updated July 4, 2026

Choosing Between Collagen-stimulating filler (PLLA) and Collagen-stimulating filler (CaHA): Understanding Your Injectable Options
Collagen-stimulating filler (PLLA)
Composition: Collagen-stimulating filler (PLLA) is composed of poly-L-lactic acid, a biocompatible and biodegradable synthetic material that stimulates collagen production in the skin.
Purpose: It is primarily used to restore volume and treat facial wrinkles and folds, especially in areas where there has been significant volume loss due to aging or other factors.
Mechanism: Collagen-stimulating filler (PLLA) works by stimulating the body’s natural collagen production over time. It is injected into deeper layers of the skin, gradually replacing lost collagen and providing a more natural-looking result that can last up to two years.
Treatment Areas: Common areas for Collagen-stimulating filler (PLLA) injections include the cheeks, temples, and nasolabial folds (smile lines).
Results: Results are not immediate and typically appear gradually over a few months as collagen production increases. Multiple sessions may be required to achieve the desired effect.
Duration: Results from Collagen-stimulating filler (PLLA) can last up to two years, depending on individual metabolism and treatment protocol.
Collagen-stimulating filler (CaHA)
Composition: Collagen-stimulating filler (CaHA) is composed of calcium hydroxylapatite (CaHA) microspheres suspended in an aqueous gel carrier.
Purpose: It is primarily used for smoothing moderate to severe facial wrinkles and folds, such as nasolabial folds, marionette lines, and to enhance facial contours.
Mechanism: Collagen-stimulating filler (CaHA) provides immediate volume correction upon injection. Over time, the calcium hydroxylapatite microspheres stimulate the body’s natural collagen production at the injection site, prolonging the results.
Treatment Areas: Common areas for Collagen-stimulating filler (CaHA) injections include the cheeks, chin, jawline, and back of the hands.
Results: Results are visible immediately after treatment due to the volume provided by the gel carrier. The collagen-stimulating effects of the CaHA microspheres help maintain the results over time.
Duration: Results from Collagen-stimulating filler (CaHA) can last around 12-18 months, depending on the individual's metabolism and treatment area.
Key Differences
- Composition: Collagen-stimulating filler (PLLA) uses poly-L-lactic acid to stimulate collagen production, while Collagen-stimulating filler (CaHA) uses calcium hydroxylapatite microspheres.
- Mechanism: Collagen-stimulating filler (PLLA)’s results are gradual and based on collagen stimulation, whereas Collagen-stimulating filler (CaHA) provides immediate volume due to its gel carrier and stimulates collagen over time with its microspheres.
- Treatment Areas: While both can treat facial wrinkles and folds, Collagen-stimulating filler (PLLA) is often used in larger areas like the cheeks, whereas Collagen-stimulating filler (CaHA) is commonly used for deeper wrinkles and hands.
- Duration: Collagen-stimulating filler (PLLA) tends to last longer (up to 2 years) compared to Collagen-stimulating filler (CaHA) (12-18 months), though individual results may vary.
Choosing between Collagen-stimulating filler (PLLA) and Collagen-stimulating filler (CaHA) often depends on the specific treatment goals, the areas of concern, and the patient’s individual preferences. Consulting with a qualified cosmetic surgeon is crucial to determine the most suitable option based on your unique needs and desired outcomes.
Results vary from person to person and are not guaranteed. Nothing here is medical advice — book a consultation and we will look at your case.
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