La Roche-Posay Hyalu B5 Serum (30ml)
About 50 Olive Young reviews read one by one · Official rating 4.8 (about 5,000 reviews) · 'Gentle, no irritation' 71% and 'Good for hydration' 76% (Olive Young's official attributes) · Hyaluronic acid + panthenol (B5) hydrating serum
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Community summary
The theme that came up most in the reviews was hydration for dehydrated skin. 'Absorbs moist without stickiness,' 'handles the tight, dehydrated feeling,' 'the hydration lasts' — these were the most frequent, at 14 reviews. The context is using this hyaluronic acid + panthenol (B5) serum as the hydration step right after toner, and Mafianet search demand for the 'La Roche-Posay B5 serum' family holds steady too. That said, these are reviewers' own impressions.
Next came lightness and gentleness. 'Light but moisturizing enough,' 'even on dehydrated-oily skin it isn't heavy and feels comfortable' — 11 reviews. Paired with comments about being gentle and non-irritating, Olive Young's official attributes show 'gentle, no irritation' at 71% and 'good for hydration' at 76%. Reviewers also said it absorbs fast so the next step and makeup go on well (9 reviews).
Repurchase and brand trust also came up often. 'I trust it because it's La Roche-Posay,' 'I keep repurchasing it' — 7 long-term stories. The caveats are clear too: some reviewers said it isn't 'outstandingly moisturizing' and suggested pairing a cream for very dry skin, some noted the price has risen, and reactions to the scent were split. Even within the same B5 line, reviewers reach for the Cicaplast Baume for soothing/repair and this serum for light hydration.
Counts from the ~50 reviews we read, tallied only where the wording was clearly legible. If anything, we undercounted rather than rounded up — these are conservative minimums.
By skin type
Olive Young's official review attributes (based on about 5,000 reviews, 4.8 rating). These are Olive Young's own tallies, not ratings we assigned.
Phrases we met in the reviews (original tone preserved, not reconstructed)
Strengths reviewers kept mentioning
- Moist without stickiness — dehydrated-skin careThe most frequent take (14 reviews). Reviewers said it doesn't feel sticky and absorbs moist, helping with the tight, dehydrated feeling, and that the hydration lasts a while.
- Light but moisturizing enough — dehydrated-oily and combination skin satisfied11 reviewers said that despite the light texture it's moisturizing enough, so dehydrated-oily and combination skin don't find it heavy and feel comfortable, with comments about using it even in summer without a burden.
- Gentle, no irritation — manageable for sensitive skin (71%)Comments about it being gentle and non-irritating line up with Olive Young's official 'gentle, no irritation' at 71%. Reviewers with dry and sensitive skin often said it was manageable.
- Absorbs fast, next step goes on wellReviewers said it absorbs quickly so the cream and makeup after it go on well (9 reviews). This leads into long-term stories of repurchasing it as a trusted La Roche-Posay derma serum (7 reviews).
Downsides (mentioned repeatedly)
- Not 'outstandingly moisturizing' — pair a cream for very dry skinAs a light hydrating serum it feels moist, but some reviewers said it isn't 'outstandingly moisturizing.' They repeatedly suggested that very dry skin use a cream after this serum.
- Some noted the price has gone upA few reviewers mentioned the price is higher than before. The context is weighing the price against the 30ml volume and comparing sale and Coupang prices before buying.
- Scent is hit or missReactions split between liking the scent and finding it bothersome. If you prefer fragrance-free, it's worth checking.
- Small 30ml sizeThere's a sense that at 30ml it runs out fast if used over the whole face daily. If you want a larger size, it's worth checking the volume.
- Official star-distribution stats not capturedThis sample had no star-distribution capture, so we cited only the 4.8 rating and the attribute graph. We'll add the numbers and cross-check once we capture them.
Best for
- Dehydrated-oily and combination skin wanting a light, non-sticky hydration layer — hydration and dehydrated-skin reviews are the most common
- Sensitive and dry skin that's easily irritated — 'gentle, no irritation' 71% is the basis
- Anyone looking for a light hydrating serum step right after toner — reviewers repeatedly said it absorbs fast
- Anyone who wants a trusted La Roche-Posay derma serum built on hyaluronic acid + B5
May not suit you if: Anyone with very dry skin wanting high moisture — this serum alone may not be enough, so pairing a cream is better / Anyone who prefers fragrance-free — reactions to the scent are split / Anyone prioritizing large size or value — it's a small 30ml and some noted the price has gone up
How to Use La Roche-Posay Hyalu B5 Serum (30ml)
- Morning and night after cleansing, apply a small amount thinly as the step after toner. Many reviewers said they finish with a cream once it absorbs
- Reviewers repeatedly suggested one thin layer in summer, and layering a cream after the serum in winter or when dry
- If dehydrated skin is bad, use it consistently morning and night — some said it absorbs fast so layering isn't a burden
- Within the same B5 line, reach for the Cicaplast Baume if you need soothing/repair and this serum if the goal is light hydration — pick by purpose
Price & buying tips
- It runs around the 20,000-won range for 30ml, varying by seller and bundle. Some noted the price is higher than before, so comparing sale and Coupang prices helps
- Reviewers reported buying during Olive Young sales and promotions — weigh the price against the 30ml volume before buying
Compared with other Serums & Ampoules picks
Real-user tally of the serum/ampoule threads (Olive Young Jjintem's own data)
See the full Serums & Ampoules ranking →
FAQ
Q. Does it really moisturize?
Hydration stories — 'absorbs moist without stickiness and handles the tight, dehydrated feeling' — were the most common at 14 reviews, and Olive Young's official attributes put 'good for hydration' high at 76%. That said, as a light hydrating serum some reviewers felt it isn't 'outstandingly moisturizing,' so we'd suggest very dry skin use a cream after this serum. Skin reactions vary by person.
Q. Is it sticky?
Most reviewers said it absorbs lightly without stickiness (14 reviews). Reviewers also said it absorbs fast so the next step and makeup go on well, and the context is that dehydrated-oily and combination skin use it comfortably in summer.
Q. How is it different from the Cicaplast Baume?
Both are La Roche-Posay B5 (panthenol) products, but the texture and use differ. The Hyalu B5 Serum is a light hyaluronic-acid-focused serum used right after toner to add hydration, while the Cicaplast Baume is a rich repair/soothing cream used to finish after breakouts, dryness or irritation. Reach for the serum for 'light hydration' and the balm for 'soothing/repair finish.' Some reviewers who use both said the order is serum (hydration) → balm (finish).
Q. Can oily or dehydrated-oily skin use it?
Because the texture is light, 11 reviewers said dehydrated-oily and combination skin don't find it heavy and feel comfortable — the context being that it absorbs fast and feels less sticky, so it's not much of a burden even in summer. That said, very oily skin applying it thickly may find opinions split, so we'd suggest starting with a small amount.
Q. Does it have a scent?
Reactions split between liking the scent and finding it bothersome. It isn't fragrance-free, so if you're sensitive to scent or prefer fragrance-free, it's worth checking.
Q. Is it okay for sensitive skin?
Comments about it being gentle and non-irritating came up often, and Olive Young's official 'gentle, no irritation' is high at 71%. Many reviewers said that as a La Roche-Posay derma serum it was manageable for dry and sensitive skin, but skin reactions vary by person, so we'd suggest a small patch test at first.
Q. When and how do I use it?
Many reviewers said they apply a small amount thinly as the step after toner, morning and night after cleansing. Reviewers repeatedly suggested one thin layer in summer, and layering a cream after the serum in winter or when dry.
Q. Where does this page's data come from?
The 4.8 rating and the attribute graph ('good for hydration' 76%, 'gentle, no irritation' 71%, 'good for dry skin' 57%) are Olive Young's official displays, while the keyword numbers are our own hand-tally of about 50 reviews (we counted only clearly legible reviews, so if anything we undercounted rather than rounded up). We don't republish review text — we only carry the analysis — and we don't assign our own ratings or make efficacy claims.
Starting from a viral Threads post with over 1.85M views, we collected real Korean users' recommendation comments on Olive Young posts, merged different spellings of the same product, and tallied mentions, likes, and staff endorsements. No ads or sponsorships — rankings come from real recommendation data only.
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