Hyalu B5 Pure Hyaluronic Acid Serum — Reddit Reviews
Updated October 17, 2026
Multi-weight hyaluronic acid boosts deep hydration and plumpness; irritation risk.
What the community says
A layered hyaluronic acid serum with panthenol, madecassoside, and a noticeably substantial slip, intended for dehydrated skin and retinoid recovery routines. It can be genuinely impressive on damp skin, yet alcohol denat and fragrance make reactive or rosacea-prone faces gamble.
What this means for you
What people love
Watch out for
Product details
Use caution
Skin Type
Product Traits
Key Ingredients
Where to buy
What the science says vs. what Reddit says
Skin Barrier
Not proven yet
Few or mixed studies. This claim isn't established.
Panthenol: 1 study tested it on its own. See all 11 studies
Dehydration
Not proven yet
Few or mixed studies. This claim isn't established.
Panthenol: 1 study tested it on its own. See all 4 studies
On Reddit: After DeepFrac laser treatment, one user credits it with saving their skin. 17 mentions
Research context, not treatment advice. Studies are about the ingredient, not necessarily this exact product.
Real Reddit threads — 68 mentions across 16 threads
La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Serum on Reddit, in one place — 16 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
“La Roche Posay Hyalu B5 Eyes completely got rid of my very bad under eye bags.”
Positive
“Couldn’t recommend LRP enough.”
Positive
“it didn’t impact the colour of my under eyes but got rid of the actual puffiness”
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
“Apply La Roche-Posay Hyalu B5 serum.”
Positive
“Non-tretinoin nights:”
Positive
“followed by Avène cleanser.”
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
