La Roche Posay Hyalu B5 Serum Review



Hyaluronic acid has gained immense popularity in the skincare industry due to its remarkable ability to hold water, making it a potent hydrating agent. This moisture-retaining quality not only helps skin maintain optimal hydration levels but also imparts a plumping effect, reducing the appearance of fine lines and wrinkles.

Hyaluronic acid is one of the key ingredients in La Roche Posay Hyalu B5 Serum. While hyaluronic acid is a beneficial ingredient, it’s crucial to remember that the overall formulation and combination of ingredients are equally important for its effectiveness and performance on your skin.

That’s why below we’re going to discuss the overall product formulation and give you all the details on the key ingredients in La Roche Posay Hyalu B5 Serum. We’ll also share some La Roche Posay reviews so that you can get an idea of what customers really think of this product. 

Is La Roche Posay Hyalu B5 Serum Right For You?

Before we get into the details, here’s the TL;DR if you just want to know whether or not  La Roche Posay Hyalu B5 Serum is right for you.

  • Key ingredients? Hyaluronic Acid
  • Skin type? All
  • Texture? Serum
  • Fragrance? Yes
  • Cruelty free? No
  • Cost? $39.99 USD for 1 fl oz (30 mL) and $53.99 for 1.69 fl oz (50 mL)

What Are The Key Ingredients in La Roche Posay Hyalu B5 Serum?

Just as the name suggests, hyaluronic acid is one of the key ingredients in La Roche Posay Hyalu B5 Serum. Before we give you the details on how hyaluronic acid may benefit your skin, we have to point out that this product contains a very high concentration of denatured alcohol.

Denatured alcohol is the third highest concentration ingredient in La Roche Posay Hyalu B5 Serum. So why is this a problem? Let’s take a closer look at what high amounts of denatured alcohol will do to your skin. 

Using this type of alcohol in skincare products makes it seem like the product is benefitting your skin. That’s because, initially, alcohol gives products a quick-drying finish, immediately degreases the skin, and imparts a weightless feel. 

However, the major problem with using high concentrations of denatured alcohol is that this ingredient is well known to cause skin dryness, irritation, and even disruption of the skin barrier. 

Furthermore, alcohol can disrupt the lipids that make up the stratum corneum (the outermost layer of skin), according to a publication in the journal BBA Biomembranes. 

While alcohol may provide short term benefits, it’s not doing your skin any good in the long run. We will still discuss the key ingredients in La Roche Posay Hyalu B5 Serum, but keep in mind that the benefits may not outweigh the risks of using a serum with such a high concentration of denatured alcohol. 

Sodium Hyaluronate

La Roche Posay Hyalu B5 Serum contains sodium hyaluronate, the salt form of hyaluronic acid. 

Sodium hyaluronate and hyaluronic acid are basically the same and the two names are used interchangeably in the skin care industry. The main differences are that sodium hyaluronate is more stable, easier to formulate, and cheaper. That’s why it is common to see sodium hyaluronate on an ingredient list even though the product name might say hyaluronic acid.

Once applied to the skin, sodium hyaluronate provides the same benefits of hyaluronic acid. Those benefits include improved skin hydration, as well as a more plump complexion with fewer lines and wrinkles. 


The “B5” in the name of this serum comes from the inclusion of panthenol, also known as provitamin B5. 

Clinical studies show that panthenol-based formulations increase skin moisture content and had a significant effect on skin barrier function by decreasing transepidermal water loss (TEWL). 

Furthermore, panthenol has been shown to improve the skin barrier function. It’s able to penetrate into the deeper skin layers and is absorbed into the cells before being metabolized into pantothenic acid. This ability to penetrate deeply is useful in adding essential moisture, helping to maintain skin’s natural moisture balance.

How to Use La Roche Posay Hyalu B5 Serum?

Fill the dropper with serum and apply 3 to 4 drops in the morning and/or evening on the face and neck. Apply after cleansing. Hyalu B5 Serum can be used alone or under a moisturizer.

Where to Buy La Roche Posay Hyalu B5 Serum?

La Roche Posay Hyalu B5 Serum and other La Roche Posay skin care products are sold on the brand’s website, as well as third party online retailers, such as,,, and more.

You can also find this brand in drug stores such as Walgreens and CVS, as well as beauty supply stores like Ulta. The brand has a store locator on their website so that you can find La Roche Posay skin care products near you.

How Much is La Roche Posay Hyalu B5 Serum?

The Hyalu B5 Serum costs $39.99 USD for 1 fl oz (30 mL) and $53.99 for 1.69 fl oz (50 mL).

Is La Roche Posay Cruelty Free?

No, La Roche Posay is not cruelty free because La Roche Posay skin care products are sold in mainland China where animal testing is required by law. 

La Roche Posay Hyalu B5 Serum Reviews

La Roche Posay Hyalu B5 reviews on the brand’s website are mostly positive, with the product receiving an average rating of 4.5 out of 5 stars after nearly 2,000 customer reviews. 

There are many 5-star reviews for this La Roche Posay Serum from customers who love that it hydrates and improves the look of skin quickly. 

However, there are a handful of negative reviews for the La Roche Posay Hyalu B5 Serum, which are mostly from customers that are concerned with the fragrance in this serum. 

Our Verdict

Overall, we don’t recommend La Roche Posay Hyalu B5 Serum due to the high concentration of denatured alcohol and fragrance in this formula. 


  • Formula contains some beneficial ingredients (sodium hyaluronate, panthenol)
  • Many positive La Roche Posay Hyalu B5 Serum reviews


  • Formula contains high concentration of denatured alcohol
  • Formula contains fragrance
  • La Roche Posay is not cruelty free


1. BBA Biomembranes, May 2012, pages 1410-1419

2. July 2011 J. Cosmet. Sci.



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