Hyaluronic Acid fillers are comprised of cross-linked chains of hyaluronic acid molecules.  The main difference between the different types of fillers are the molecular weights and the degree of cross linkage between the hyaluronic acid chains. 

Hyaluronic Acid Polymers chains can vary greatly in their length (measured by molecular weight) and these chains are cross-linked to form gels which are what comprise the Hyaluronic Fillers that are injected into your face. The degree of cross- linking and the chain length influence characteristics of the filler. G Prime (G’)  refers to the stiffness/elasticity of the filler and its ability to add lift. Generally speaking fillers with a higher G’ will be firmer and be able to add more lift which fillers with a lower G’ will be softer and will be more suitable to treating delicate areas.

However, this probably doesn’t mean much to you. What you really want to know which filler is best for each area of the face and which filler is least likely to migrate.  In this post I interviewed one of best Aesthetic Injectors in Toronto to bring you a super detailed guide between the differences among the most common dermal fillers!

But first, here is a list of the most popular Juvéderm and Restylane Filler Products and the Hyaluronic Acid concentration per mL in each of the fillers. 


  • VOLBELLA-  15mg/ml. 
  • VOLLURE- 17.5mg/ml
  • VOLUMA- 20mg/ml 
  • ULTRA XC-  24mg/ml
  • ULTRA PLUS XC-  24mg/ml;


  • Restylane L: 20mg/ml 
  • Lyft: 20mg/ml 
  • Kysse: 20mg/ml 
  • Refine: 20mg/ml
  • Define: 20mg/ml

I went IN-DEPTH in an interview with one of the Best Cosmetic Injectors in Toronto, Emily Varga, RN, BScN, about the differences between various filler brands.

I’m impressed with her work in general but her work especially with the lips is fabulous! She’s definitely one of the best when it comes to filling the lips in a beautiful aesthetic shape while preventing migration to the philtrum as is so common in the plastic surgery industry. 

We discussed everything from which is her favourite brand of filler, which fillers are most  and least likely to migrate, which fillers produce the most natural results, and much more!

Many thanks to Emily for being such a great interview!

To see more of her work check out her out on IG or go to her website: https://emilyvarga.ca/

What Are The Main Differences Between Juvéderm and Restylane?

The main clinical differences in these products lie mostly in the consistency, degree to which they spread, and longevity. Juvederm tends to be smoother and therefore more susceptible to spreading out.  In some cases, this may be advantageous, but migration in certain areas may produce undesirable effects.  This spreadable nature of the product makes it less likely to cause lumps than Restylane and other dermal fillers. 

Comparatively, Restylane tends to be more granular and generally remains where it was injected.  This makes it ideal for fine and controlled injections such as the lips or scars/wrinkles, where you prefer no migration or diffusion.

I personally find most Juvederm products to feel more firm to the touch, which is likely due to the cross-linking level and high degree of elasticity (G’), which affects the amount of water absorbed and how resistant the filler is to deformation (pressure – think of it as bounciness vs. malleable).  Again, this may or may not be desirable, depending on the aesthetic goal. 
-Emily Varga, RN, BScN

Which is less Likely to migrate, Juvederm or Restylane?

Restylane is less likely to migrate than Juvederm from my experience. This is due to it’s more granular nature which means it spreads less once injected into the skin. This can be beneficial when injected certain areas like the lips but more spreadability may be desired when working with other areas.

Juvederm is said to last 1-2 years, however,  I have many patients with remaining filler even after 4-6+ years, nearly all of them experience some degree of migration. Restylane generally lasts 6-18 months for the average person.

Despite the differences in the fillers, many of the complications we see with Juvederm and Restylane are often not caused by the product itself but are likely due to the wrong selection within the product line for the target area and/or injection depth.

-Emily Varga, RN, BScN

Is there a Significant Difference Between Injecting different products from various filler brands? For example, would injecting Juvederm Volbella and Voluma provide a Noticeably different result?

Absolutely you can expect different results from different products within various filler brands, that is their purpose.  As an injector, there are a few key qualities of filler that we consider when selecting a product to treat a specific concern, known as its rheology. These components include: concentration and size of HA molecule, elasticity, viscosity, and cross-linking. These product mechanics come together to define how well a filler can be adapted to a tissue and influence its bio-integration. 

Certain products are intended for certain tissues (i.e dermis vs. superficial fat vs. deep fat).  It can get very complicated, but an in-depth understanding of these concepts is critical to delivering effective aesthetic outcomes.  This is why it is important to choose an injector who is well-versed in anatomy and understands the filler they are using and why – never be afraid to ask. 
-Emily Varga, RN, BScN

Have you noticed a difference between the difficulty of dissolving products from Restylane and Juvederm?

When it comes to dissolving, I do not notice a difference and both respond well to hyaluronidase treatment in the average person. The only instances where the product may make some difference when doing corrections is in the case of lumps and encapsulation.  Restylane seems to cause lumps more often, likely due to less spreadability on injection. I believe that these side effects can be largely mitigated by the injector and patient after-care. 

-Emily Varga, RN, BScN

How does Stylage compare to Juvederm and Restylane? Can you also go into detail about the Stylage equivalent to the other brands for the lips and how it compares?

Stylage is my favourite brand of filler to work with. It is among the newest generation of filler, which utilizes the most recent technology available in the market. It has a patented IPN-like cross-linking technology that sets it apart from other fillers. It also includes the antioxidant Mannitol, commonly found in many fruits and vegetables.  This is important because when a needle enters a tissue and causes damage, free radicals are released which increases hyaluronic acid breakdown.  Mannitol neutralizes these free radicals thus supporting the health and longevity of the filler and surrounding tissues. What you will notice is that Stylage feels softer and more natural, doesn’t migrate, may be injected at all depths without lumps, and is long lasting. 
When treating the lips, the goal should be natural looking AND natural feeling. The reason that I choose Stylage is because your lips actually feel like your own after treatment – not firm, not lumpy and not puffy-looking – just natural. This is one of the key reasons Stylage stands out among the rest.

-Emily Varga, RN, BScN 

What are your Favourite Stylage Products for the lips, chin, cheeks, and facial Folds

Picking a favourite or preferred product is difficult, the entire range has different applications and all are amazing! I always use Stylage S or M for the lips, depending on what the goal is and what the client is starting with. S is also great for superficial treatment of lines and wrinkles, undereyes or scars. M works well for shadowing or “glazing” as I like to call it.  Stylage L is reserved for chins, jaws and cheeks and when a little extra volume is needed or for more structure, XXL is the preferred choice! I am very excited for their products that they’re optimizing for Canadian markets such as HydroMax and SpecialLips– more on that as it comes!

-Emily Varga, RN, BScN

Does the Brand and Type of Filler used make a Large Difference on the appearence and size/volume added to the injected area?
For ex, would using 2ml of Volbella vs Vollure achieve a Different size/appearence the lips?

Within filler brands, the product selection makes a huge difference on the appearance of the injected area. It is your injector’s job to understand the indication for each product and how it behaves in the tissues. For example, 2ml of Stylage S looks dramatically different than 2ml of Stylage XXL, the latter being much more noticeable and volumizing. The same concept exists across different brands with comparable products, though usually more subtly– Ex. Juvederm Voluma vs. Stylage L are comparable, yet different in their behaviour in the tissue.

-Emily Varga, RN, BScN

I was wondering if you’ve seen the post by Dr. Ben Talei pleading his patients to not get Voluma in the under-eyes and I was wondering what your thoughts were about this.


Any injector willing to put Voluma in under eyes should be called to question – this product is intended for cheeks, chin or jawline, NOT the delicate undereye area.  Voluma was created to build volume: it is highly elastic, holds a lot of water and is quite thick.  Not only does this product placed here provide an unsightly, puffy result, it also increases the risks associated with undereye filler injections. He is absolutely right to advise them never to use this product in this area! AH!

-Emily Varga, RN, BScN


Can you spot just from looking if someone's lips/cheeks/face have been injected with Juvederm, Stylage, Restylane, or a different brand of filler?

 This is an interesting question- but yes, usually I can. I am also able to identify other injector’s work, merely through observation.  There are many talented injectors whom each use different brands for their own reasons and then there are plenty of poor injectors using the same brands. This makes the distinction that not just the product, but the technique, skill, and style of the injector matter greatly in the outcome. This is why you should base your decision more so upon the injector’s expertise than the filler brand.

-Emily Varga, RN, BScN

What is the Best filler for the Nasolabial Folds while preserving a natural smile

When it comes to treating the nasolabial folds naturally, you want a flexible product with high elasticity. Thick products here result in thick looking or distorted animations when smiling. 

 I typically use Stylage S superficially in the skin and sometimes treat the pyriform aperture (by the nostrils) deep with Stylage L or XXL, when indicated. I see great injectors using Restylane in the same way. I prefer Stylage because I have had absolutely zero issues with lumps, tyndall effect (blueish discolouration of the skin) or more serious issues like necrosis. Their formulations, in my opinion and experience, are superior to other filler brands for this indication.

-Emily Varga, RN, BScN


What are some of the top picks of brand/kind of filler for adding cheek volume and shape?

Choosing the right filler for cheek volume and shaping is important. Diagnosing the issue and taking into respect the entire face proportion is even more so. 

When the issue is mid-face volume loss, I typically opt for Stylage  M , L or XXL, depending on the persons skin quality and BMI/Facial fat volume. Thinner products like M or L are more suitable for thinner skin and subtle corrections whereas thicker products like L and XXL are more suitable for thicker skin, and more aggressive volume correction. 

I am selective of who I choose to “contour” as they must have a fairly low BMI to achieve their desired result, otherwise overfilling the face can result in someone looking “full” or “puffy”. 

Contouring is best done with a thick, highly elastic product like L or XXL so that the product gives a pronounced look and also stays in place. Filler naturally absorbs water and settles flat, so massage techniques are also important to improve and sustain results.

-Emily Varga, RN, BScN

Which type of Filler is best to use for the Jawline form your experience?

Jawline is best treated with a dense product as we are trying to re-create the appearance of bone.  There is minimal fat along the jawline so the right product and placement in this area is key. I usually use XXL or L depending on the client’s goals and starting point.

-Emily Varga, RN, BScN

If you have leftover filler from injecting the lips would it be ok to use that for the chin/vice versa?

After filling the lips, leftover product may absolutely be used elsewhere, why waste it (unless it’s completely unnecessary or unwanted). 

Thinner products, like Stylage S, may be used in shadowing, wrinkles, nasolabial folds, undereyes/troughs, or the chin in some cases. 

Medium thickness products like Stylage M can be use for wrinkles, nasolabial folds, nose tip, temples or the chin. I always have a conversation with the client to see if they have any concerns or may suggest a good use for remaining filler.

 Something I always pay attention to is the proportion of the lips to the nose and chin– often when we bring the lips out with more volume, a small bit in the chin harmonizes proportions to create a delicate and balanced profile.

-Emily Varga, RN, BScN

If You Have Some Of The Thicker Filler, Such As Voluma From Using In The Cheeks, Would You Recommend Against Using It For The Lips?

Although its rare to not use a full syringe when treating one of these areas, any remnants of cheek/jaw/chin filler may be used elsewhere but almost never in the lips as it’s too thick and can create an unnatural looking result. 

Thicker products are not meant to be at superficial depths as it may compromise the health of the tissues. They are specifically formulated for deeper tissues and should only be used where appropriate. I like to tell my clients, you are paying for the procedure, not the ml, so discarding remaining product is completely fine and recommended if it has no beneficial use elsewhere. Honesty here is key!

-Emily Varga, RN, BScN


What is More Important for Preventing Migration of Filler (for ex into the philtrum), Spreading the Injections Over Multiple Sessions or the Brand/Type of Filler Used?

 It is hard to say which matters more, I wouldn’t say that they are mutually exclusive. If you fill a lip with a gradual approach using the wrong filler, you aren’t going to achieve a natural result. The same goes for the reverse; treating quickly with the right product doesn’t allow time for the lip to accommodate the change in volume again resulting in a sub-optimal result. Both of these matter equally in creating natural looking and feeling lips that last. 

-Emily Varga, RN, BScN


Which filler brand/type do you recommend for use in the Under-Eye area while maintaining a natural look

For the  undereyes, I prefer Stylage S injected with cannula technique for enhanced safety, accurate depth and consistency of injection. This product is smooth and spreadable which reduces risk of lumps and bumps.

I know many injectors who love Belotero for this area.  Less is more here, and candidate selection is the most important. If you consistently experience puffy eyes, have bags or festoons, severe creepiness or skin laxity you may not be a good candidate.  Undereyes are something you want to get right the first time as dissolving in this area is tricky and the delicate skin must be considered. Sometimes cheek support sufficiently corrects the undereyes as well or is used as a support scaffold for trough filler.  Careful assessment is paramount to achieve the perfect correction. 

-Emily Varga, RN, BScN


Have you seen the Video by Victorian Cosmetic Institute explaining why they don't believe in Filling Faces anymore due to the Filler never really Dissolving and just Migrating and if you have what are your thoughts about this?

This video presents some contradicting arguments throughout and eventually comes full-circle.  I had to rewatch to make sure I was understanding him correctly.  There is scientific evidence of the pathophysiological processes surrounding filler degradation.  While I do agree that science doesn’t always match the clinical manifestations, to my understanding and experience, properly placed fillers do gradually breakdown the same as your endogenous hyaluronic acid. I agree that it is the case that some fillers last exceptionally long and are  prone to migration.   He also doesn’t disclose which filler he and other injectors in his area are using- it may be an overgeneralization to all fillers and he may be seeing a certain brand do this over time.
Regarding his opinion on “filling faces” versus ” Balance and proportion” I am confused because isn’t this everyone’s goal with filler treatments? What does he consider “generalized filling” versus “treating temple volume loss” or “balancing proportions”. Is anyone out there bulk-filling with no intention? Should we find them and put them on blast? I agree with him that using small amounts is better and the end goal should be making the person more attractive.  (He should have left his video at that point and said nothing else!)
He goes on to make a comment that slimmer faces are more attractive.  I think this is narrow minded and his selection of photos is completely ludicrous.   Slimmer in the right areas is important, age is important, skin as a canvas is important. It is not surprising that you would find his selected images more appealing with slimmer faces – for a medical doctor the bias here is unsettling. (Like he put red-carpet Charlize next to Monster Charlize complete with bad teeth, fried, overbleached hair, skin damage, no eyebrows or lashes, and weight gain.. of course she looks better before!)
To his point of replacing volume lost with aging, there is a sliding scale here.  As we age and lose some of the baby fat, typically located in the buccal, lower face, mid-cheek, brow bones, forehead and temples we do look more mature,  defined, and more attractive.  Then as we continue to lose more fat from these same areas and also begin to see skin quality worsen we begin to look tired, sad, or aged. He also completely ignores the issue of bone remodeling that plays a significant role in the way the face ages, particularly in menopausal women.  Replacing lost volume to the level it was at when considered the MOST attractive, is the goal to keep the face lifted and more attractive.  I usually tell my younger patients (18-25 years) looking for jawline and cheek contour to wait 3-5 years as this will likely happen naturally.   
I do agree about his “definition/contour”  element, to a degree.  Immediately post-injection things always look sharper until the natural water absorption properties of HA set in, which does result in a slightly softer look. This is something I always explain to my patients beforehand and why product selection is key! But the only way to achieve definition is not exclusively with weight loss- it is a balance- and absolutely achievable with fillers in the right candidate.  I will turn away full-faced and/or high BMI patients if I feel they will not get the results they are looking for. 

-Emily Varga, RN, BScN

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