Biostimulators vs. Dermal Fillers in Montréal

A dermal filler is a gel, most often made of hyaluronic acid, that is placed beneath the skin to add volume or definition right where it is needed. The effect is visible immediately: a cheek is lifted, a fold is softened, a chin is given projection. The results are temporary because the body gradually breaks down and absorbs the material, so treatment is repeated to maintain the effect (U.S. Food and Drug Administration, n.d.).

This article focuses on poly-L-lactic acid biostimulators, which differ from other collagen-stimulating formulations. Their particles are delivered in a suspension beneath the skin. Initial fullness or swelling can be temporary as the liquid is absorbed; the intended collagen-related change develops gradually over weeks to months. The aim is improved support and firmness, with results that depend on the product, technique, and individual response.

A 2024 systematic review of poly-L-lactic acid, the most studied biostimulator, found that several trials reported increased dermal thickness and improved firmness, with results in some studies maintained for two years or longer. The same review is honest about the limits: the overall quality of the evidence is still low, and reported side effects included bruising, tenderness, swelling, and occasional nodules (Signori et al., 2024).

Filler tends to be the answer when a specific, defined change is wanted: more volume in a particular spot, sharper definition, correction of a hollow. Biostimulators tend to suit skin that has become thinner or shows early laxity across a broader area, where the goal is global firmness rather than a single correction. Common treatment areas include the folds beside the nose, hollow temples, flattened cheeks, and volume lost after weight change.

The two are not rivals. Many treatment plans use each where it works best: filler for structure in one area, a biostimulator for skin quality in another.

Biostimulator results are gradual and typically require a series of sessions, with the full effect developing over months. This patience is the trade-off for a change that looks entirely like your own skin. As with every injectable, results vary, side effects are possible, and a skilled, licensed injector is essential (Signori et al., 2024; U.S. Food and Drug Administration, n.d.).

Every treatment here begins with a personalized facial assessment and a plan built around your anatomy and goals. If you are curious whether a biostimulator, a filler, or a combination suits you, book a consultation and we will guide you honestly.