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La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum ingredients: is it worth it?
This is a hydration-focused serum with solid humectant chemistry but undermined by high denatured alcohol and unnecessary fragrance.
This is a hydration-focused serum with solid humectant chemistry but undermined by high denatured alcohol and unnecessary fragrance.
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The efficacy score is driven by a multi-weight hyaluronic acid system (sodium hyaluronate, sodium acetylated hyaluronate, hydrolyzed hyaluronic acid), strong classic humectants (glycerin, propylene glycol, pentylene glycol, butylene glycol, panthenol), and barrier-supporting acetyl glucosamine and madecassoside, which together can meaningfully improve surface hydration and transient plumpness when used consistently. However, the early placement of denatured alcohol suggests a relatively high concentration that prioritizes a fast-dry, weightless texture over maximal barrier support, and the presence of fragrance in a leave-on treatment further detracts from tolerability—especially for sensitive, compromised, or rosacea-prone skin—so the formula does not reach top-tier status for barrier repair despite its humectant density.
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DemythSkin rates La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum 4.3/5 for efficacy and 3.6/5 for safety.
CONTAINS COMMON SENSITISERS⌄
Fragrance components and essential oils that more often cause reactions in sensitive skin: Parfum, Fragrance. Most people tolerate them; patch test if your skin reacts easily.
ACTIVE INGREDIENTS BY TIER
Gold Standards
High clinical proof | Skin-transformativeReliable
Proven resultsPotent
Developing evidenceOverhyped | Marketing
Hype | Limited dataDocumented Irritants
Evidence-backed flagFORMULATION BASE (12)⌄
FULL INGREDIENT LIST⌄
Aqua/Water/Eau, Glycerin, Alcohol, Denat, Propylene Glycol, Panthenol, Pentylene Glycol, Dimethicone, Peg-6 Caprylic/Capric Glycerides, Alpinia Galanga Leaf Extract, Calcium Chloride, Glyceryl Isostearate, Madecassoside, Ppg-6-Decyltetradeceth-30, Sodium Acetylated Hyaluronate, Sodium Hyaluronate, Algin Adenosine, Ammonium Polyacryloyldimethyl Taurate, Propanediol, Hydrolyzed Hyaluronic Acid, Hydroxyacetophenone, Caprylic, Capric, Triglyceride, Caprylyl Glycol, Citric Acid, Trisodium Ethylenediamine Disuccinate, Acetyl Glucosamine, Xanthan Gum, Butylene Glycol, 1,2-Hexanediol, Tocopherol, Phenoxyethanol, Parfum, Fragrance.
WHAT EACH INGREDIENT DOES (24)⌄
- Aqua/Water/Eau
- Primary solvent
- Glycerin
- Humectant for hydration
- Alcohol, Denat
- Volatile solvent, penetration aid
- Propylene Glycol
- Humectant and solvent
- Panthenol
- Humectant, soothing agent
- Pentylene Glycol
- Humectant, solvent
- Dimethicone
- Silicone-based skin protectant
- Peg-6 Caprylic/Capric Glycerides
- Emulsifying solubilizer
- Alpinia Galanga Leaf Extract
- Botanical antioxidant / soothing
- Calcium Chloride
- Electrolyte, stability aid
- Glyceryl Isostearate
- Emollient, texture enhancer
- Madecassoside
- Soothing centella-derived component
- Ppg-6-Decyltetradeceth-30
- Nonionic surfactant, solubilizer
- Sodium Acetylated Hyaluronate
- Modified hyaluronic acid humectant
- Sodium Hyaluronate
- Hyaluronic acid salt humectant
- Algin
- Viscosity controller, film former
- Adenosine
- Skin-soothing, signaling molecule
- Ammonium Polyacryloyldimethyl Taurate
- Gel-forming polymer thickener
- Propanediol
- Solvent and humectant
- Hydrolyzed Hyaluronic Acid
- Low molecular weight humectant
- Hydroxyacetophenone
- Antioxidant and preservative booster
- Caprylic, Capric, Triglyceride
- Emollient, skin-softening agent
- Caprylyl Glycol
- Humectant and preservative booster
- Citric Acid
- pH adjuster, mild chelator
EXTERNAL CITATIONS
Hyaluronic Acid / Sodium Hyaluronate: Papakonstantinou E et al. Hyaluronic acid: A key molecule in skin aging. Dermatoendocrinol. 2012.
Panthenol: Proksch E et al. Topical panthenol in skin disorders: A systematic review. J Dermatolog Treat. 2017.
Madecassoside: Jung M et al. Madecassoside improves skin barrier function in damaged skin. Int J Dermatol. 2016.
Acetyl Glucosamine: Bissett DL et al. Acetyl glucosamine: A component of topical formulations for skin benefits. Dermatol Ther. 2004.
Denatured Alcohol: Lodén M. The clinical benefit of moisturizers. J Eur Acad Dermatol Venereol. 2005 (discussion of barrier disruption with drying alcohols).
DISCLAIMER: THIS ANALYSIS IS FOR INFORMATION ONLY. NOT MEDICAL ADVICE. AI-GENERATED DATA BASED ON PUBLICLY AVAILABLE INGREDIENT LISTS. VERIFY WITH A MEDICAL PROFESSIONAL.
A cheaper serum that scores as high or higher
A different formula for the same concern (hydration) that scores at least as high on both efficacy and safety.
La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum: common questions
Is La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum worth it?
La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum scores 4.3 out of 5.0 for efficacy (Effective) and 3.6 out of 5.0 for safety (Mostly Gentle) on DemythSkin's independent ingredient analysis. This is a hydration-focused serum with solid humectant chemistry but undermined by high denatured alcohol and unnecessary fragrance.
What are the key active ingredients in La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum?
La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum contains no gold-standard actives. Its formula is built on supporting and base ingredients rather than clinically transformative actives.
Does La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum contain fragrance or known irritants?
DemythSkin flags these ingredients in La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum as documented irritants: Alcohol, Denat, Parfum, Fragrance. This product does contain fragrance.
How is La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Face Serum scored?
DemythSkin grades every product on two independent scores: efficacy (whether the ingredients have clinical evidence of working) and safety (irritation and sensitisation risk). Ingredients are graded S through D against a database of over 3,000 compounds. Brand and price are not part of the score, and no brand pays for one.
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