Restylane, Juvederm, Teosyal, Stylage, Belotero — what really sets these fillers apart

Hyaluronic acid that isn't equal to hyaluronic acid

Before we look at specific brands, it's worth understanding one basic chemical fact: the hyaluronic acid used in aesthetic medicine is a substance naturally present in the human body — in skin, joints, the eyeball. The body produces it itself, which is why fillers are so well tolerated and rarely trigger allergic reactions (unlike older collagen fillers derived from bovine blood).

The real issue is different: pure, unmodified hyaluronic acid breaks down in the body within a few days. That's far too fast to have any clinical relevance. So every filler sold under names like Restylane, Juvederm, Teosyal or others has undergone cross-linking — a process that links its molecules into a three-dimensional network, making it far more durable. This is where the real story of differences begins.

Cross-linking is a chemical process in which hyaluronic acid molecules are "bonded" together using a linking agent — most commonly BDDE (butanediol diglycidyl ether). Every manufacturer does this differently: acid concentration, cross-linking density, process technology and final consistency all vary. These variables determine whether a filler is soft and pliable (good for lips, the eye area) or firm and supportive (good for cheekbones, jawline). Choosing a product means choosing a tool — not a brand.

What really sets them apart — five key parameters

To compare filler brands in a way that actually means something, you have to move past the brand name and look at product properties. A handful of parameters describe those properties — and these are exactly what a doctor considers when matching a tool to a specific facial area.

• Consistency and elasticity (G'). Every gel has its own "firmness" — its ability to hold shape under pressure. A filler with high G' is springier and suits areas that need support (cheekbones, chin, jawline). Low G' means a soft, flowing gel — ideal where the face moves a lot and a natural look matters (lips, eye area). Matching firmness to location is the difference between a natural result and a "filled" one.
• Cross-linking density. The denser the molecular network, the more durable the product and the more resistant it is to the enzymes that break down hyaluronic acid (hyaluronidases). Heavily cross-linked products can last considerably longer, but they're also less easily absorbed by the body — an advantage or a drawback depending on the situation.
• Cohesivity — whether the gel "holds together". This property determines how the product spreads through tissue. High cohesivity means the filler keeps its structure as a single mass; low cohesivity means it spreads more easily and integrates into the tissue's microstructure. Belotero is known for exceptionally high tissue integration, which is why it's often chosen for areas requiring fine, subtle work (fine lines, the eye area).
• Concentration and effective volume. Hyaluronic acid concentration (the amount of active substance per ml) isn't the same as quality — too high a concentration can mean a heavy, unnatural-looking product. What matters is how much of that concentration is effectively cross-linked, versus how much is "free" hyaluronic acid that absorbs faster.
• Safety profile and clinical history. Older brands (Restylane has been around since 1996) carry decades of research and millions of injections worldwide behind them. That doesn't make newer brands worse — but it does mean the long-term behaviour of older products is better documented, which matters when assessing risk.

Restylane, Juvederm, Teosyal, Stylage, Belotero — what each one "thinks"

Each major brand has its own "character" — a product philosophy that has historically shaped its range of applications. Understanding this isn't about having a ready answer to "which is best?" It's about knowing what to discuss with your doctor — and why choosing a product is a clinical decision, not a preference.

Looking at the comparison above, it's easy to see that no single product is "the best" — each one excels in its own area. An experienced doctor keeps several brands on hand and matches them to the specific location, injection depth, facial movement dynamics and the individual properties of the patient's tissue. It's this selection — not simply the fact of using hyaluronic acid — that builds a result which looks natural and lasts as expected.

Results that differ from area to area

Understanding the differences between products only makes sense when you connect them to a specific area of the face. The face isn't a uniform surface — each area has different tissue properties, different skin thickness, different movement dynamics. What works brilliantly on the jawline may be completely unsuitable for the thin skin under the eyes.

• Lips — an area with exceptionally high mobility. Soft, elastic products with low G' work well here. A gel that's too firm feels unpleasant in the lips and looks unnatural during movement. Classic choices: soft Restylane lines, Belotero Balance, Juvederm Volbella.
• Eye area (tear troughs, lower eyelids) — the most delicate zone of the face, where skin is thin and the risk of the Tyndall effect is real. This area needs products with exceptional tissue integration. It's reserved for very experienced doctors, using a product chosen for minimal invasiveness.
• Cheekbones and temples — deep correction requiring a firm, supportive product (high G'). Here the product must hold its shape and not "sink" under gravity and facial movement. Choices include Restylane Lyft, Juvederm Voluma, Teosyal Ultra Deep.
• Jawline and chin — similar to the cheeks: deep injection, a product that supports structure, precise contouring. The choice comes down to balancing firmness against a natural side profile.
• Nasolabial folds and marionette lines — an area of moderate mobility. Intermediate products, balanced between elasticity and support, work best. It's important not to "overload" the area or create an effect of excessive fullness.

How long it lasts, and what determines longevity

Filler longevity is a topic where expectations often diverge from reality. Most people hear "six to eighteen months" and treat it as a guarantee. In fact, it's a wide range that depends on several overlapping variables.

• Cross-linking density of the product — more heavily cross-linked products degrade more slowly. This is a fixed property of the specific preparation, and one reason "volumising" products last longer than delicate hydrating ones.
• Injection site — areas with high mobility (lips) break down the product faster than static zones (temples, jawline). Local tissue metabolism varies noticeably across the face.
• Individual metabolism — everyone's body produces the enzymes that break down hyaluronic acid at a different rate. Some people "use up" fillers noticeably faster; others retain the effect longer than manufacturers state.
• Physical activity and lifestyle — people who are very physically active or have a fast metabolism often see shorter-lasting results. Oxidative stress and certain diets can also speed up degradation.
• Injection depth and technique — a product injected at the correct depth, in line with anatomy, works optimally. Technique errors can shorten the effect or cause uneven absorption.

In practice, longevity isn't just about the product — it's the result of the product, the location, the patient's metabolism and the technique used. Manufacturer figures are best treated as a reference point, not a guarantee. After the first treatment, we know far more about how a specific body responds to a specific product, and can plan future sessions accordingly.

What to do with this — before your treatment

Understanding the differences between filler brands has one main practical purpose: helping you follow the conversation with your doctor — and listen to it more knowingly. Not so you can "order" a specific product yourself (that's the specialist's role), but so the right questions actually get asked.

Ultimately, what you're looking for in an aesthetic medicine clinic is simpler than any list of product parameters: you want to look natural, healthy, and like the best version of yourself — not like someone who's had something "injected". That's the standard your doctor should apply to every product decision. The brand in the syringe is one tool in the kit — a tool that, in the right hands and the right place, can make the difference between a result only you notice in the mirror, and one everyone else notices too.