Hyalu B5 Pure Hyaluronic Acid Serum — Reddit Reviews
Updated September 23, 2026
Hyaluronic acid hydration with B5 and madecassoside; stings reactive skin.
What the community says
A hyaluronic acid serum with panthenol, madecassoside, and dimethicone that people use for damp-skin hydration and a plumper feel. It helps dry, tret-flushed skin, but the alcohol denat and fragrance can light up sensitive faces.
What this means for you
What people love
- Damp-skin hydration that actually feels substantial
- Panthenol plus madecassoside for barrier support
- Layers cleanly and vanishes once dry
Watch out for
- Alcohol denat and fragrance can sting reactive skin
- Can be too thick for tret routines
- Some rosacea and sensitive-skin users break out
Product details
Use caution
Skin Type
Key Ingredients
Where to buy
Real Reddit threads — 65 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
“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
“La Roche Posay hyalu b5 has worked for me”
Mentioned
“I’ve also seen a few people suggest the hyalu b5 so I’ll give it a try!”
Mentioned
“I’ll definitely look into adding something extra for moisture”
Mentioned
