Hyalu B5 Pure Hyaluronic Acid Serum — Reddit Reviews
Updated September 3, 2026
Hyaluronic acid serum delivers deep hydration and plumps skin; can irritate sensitive areas.
What the community says
A thick hyaluronic acid serum aimed at boosting hydration and plumping skin. It's frequently recommended during tretinoin use and for dry skin types. However, the fragrance and alcohol content can cause irritation and swelling, especially near sensitive areas like eyes.
What this means for you
What people love
Watch out for
- Can irritate sensitive and rosacea-prone skin due to fragrance and alcohol
- May cause swelling and redness, especially around under-eye areas
- Thicker texture can increase irritation when layered with tretinoin
Product details
Use caution
Skin Type
Key Ingredients
Where to buy
Real Reddit threads — 61 mentions across 15 threads
La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Serum on Reddit, in one place — 15 threads from r/tretinoin, r/koreanskincare and 4 more, summarized.
“Serum: La Roche-Posay Hyalu B5 Serum with Hyaluronic Acid”
Positive
“I have learned that hydration is key to make your skin happy, especially when on something as drying and irritating as tretinoin.”
Positive
“Serum: La Roche-Posay Hyalu B5 Serum with Hyaluronic Acid.”
Positive
“Morning: - La Roche Posay Hyalu B5 serum (this product makes a huge difference for me for deep hydration) straight on wet skin”
Positive
“La Roche Posay Hyalu B5 serum”
Positive
“this product makes a huge difference for me for deep hydration”
Positive
“kept the rest of my routine super boring to isolate the results: thayers toner, beauty of joseon ginseng essence, lrp hyalu b5”
Positive
“and then a layer of the pink cream over the patchy areas.”
Positive
“That evening, everything I put on my skin seemed to sting, from the Cerave Hydrating cleanser to the la Roche Posay Hyalu B5 serum...”
Mentioned
“...everything I put on my skin seemed to sting...”
Mentioned
“...the la Roche Posay Hyalu B5 serum and even my beloved Aestura Atobarrier 360.”
Mentioned
“I also simplified my other skincare steps, focusing on basic products to strengthen my skin barrier”
Positive
“such as La Roche-Posay B5 serum”
Positive
“My skin looks more stable.”
Positive
“Came home, took a shower, and then applied my La Roche-Posay Hyalu B5 serum like I always do. Big mistake.”
Cautionary
“My face started burning and within hours I was bright red and peeling everywhere.”
Cautionary
“LRP hyalu b5 serum does have quite a bit of alcohol and also parfum in it that could be an irritant.”
Cautionary
