Isntree Hyaluronic Acid Fresh Sun Serum SPF 50+ PA++++
Ingredients and claims, checked
Last checked September 1, 2026
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What is it like at a glance?
What is this product?
- What to expect
- It's made for better hydration and better barrier support.
- When
- Morning
A chemical-filter sunscreen with a watery feel. It sinks in fast with no white cast and finishes fresh. It comes in a 50 ml size.
Who is it for?
Less suited to
- Sensitive skin
- Very dry skin that needs a heavy, sealing moisturizer
What's good, and what to watch for?
Good points
- Ectoin adds moisture
- Allantoin calms the skin
Watch-outs
- Pregnancy: check first (Retinyl Palmitate)
- If you clog easily: Carbomer, Squalane
- If you get fungal acne: Polyglyceryl-3 Distearate, Glyceryl Stearates
What makes it different?
Its hydrating serum texture covers moisture and sun protection in one light layer.
How do you use it?
- Pairs well with
- A hydrating toner or lightweight humectant serum applied just before it
What is in it?
The full ingredient list as the brand publishes it, in the printed order. Tap a name to read about that ingredient.
Key ingredientWorth a closer look
- Water
- Dibutyl Adipate
- Propanediol
- Butyloctyl Salicylate
- Ethylhexyl Triazone
- Niacinamide
- Drometrizole Trisiloxane
- Polyglyceryl-3 Distearate
- Terephthalylidene Dicamphor Sulfonic Acid
- Polymethylsilsesquioxane
- Diethylamino Hydroxybenzoyl Hexyl Benzoate
- Tromethamine
- Panthenol
- 1,2-Hexanediol
- Pentylene Glycol
- Glyceryl Stearates
- Silica
- Caprylyl Methicone
- Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine
- Potassium Cetyl Phosphate
- Lactobacillus Ferment
- Poly C10-30 Alkyl Acrylate
- Methylpropanediol
- Carbomer
- Acrylates/ C10-30 Alkyl Acrylate Crosspolymer
- Ethylhexylglycerin
- Hydrolyzed Sodium Hyaluronate
- Xanthan Gum
- Adenosine
- Polyether-1
- Sodium Hyaluronate
- Biosaccharide Gum-1
- Squalane
- Allantoin
- Erythritol
- Tocopherol
- Ectoin
- Hydroxypropyltrimonium Hyaluronate
- Zinc Hydrolyzed Hyaluronate
- Glycerin
- Butylene Glycol
- Houttuynia Cordata Extract
- Citric Acid
- Sodium Acetylated Hyaluronate
- Hydrolyzed Hyaluronic Acid
- Hydrogenated Lecithin
- Hyaluronic Acid
- Polyglyceryl-10 Stearate
- Centella Asiatica Extract
- Sodium Hyaluronate Crosspolymer
- Sodium Ascorbyl Phosphate
- Tocopheryl Acetate
- Cocos Nucifera (Coconut) Liquid Endosperm
- Potassium Hyaluronate
- Retinyl Palmitate
- Biotin
- Thiamine Hcl
- Folic Acid
- Pyridoxine
- Cyanocobalamin
Ingredients with no mark are ones we found nothing notable about, and when marks overlap on one ingredient we show the caution first.
What the claims add up to
- Only partly backed:
- better hydration (amount unknown) · better barrier support (amount unknown)
See each claim, checked (3)
Claims, checked
The hydrating serum texture enables quick absorption to the skin and leaves a refreshing, moisturizing finish.
backed by evidenceFormulated with Squalane, Allantoin and Ectoin that deliver intense moisture to the skin and help strengthen the skin barrier.
plausible, not testedA sun serum with a broad spectrum of SPF 50+ PA++++ helps protect the skin from UV rays.
partly backed
We quote each claim exactly as the brand published it, then check it against the ingredient list and the brand's own documents.
Which articles cover it?
Articles on this site that write about this product.
- Korean sunscreens for oily skin, judged on whether you will reapply themProtection is decided by how much you use, not by the number on the box. Four Korean sunscreens read on texture, filters and what makes a second coat likely.
- Korean sunscreens that do not cast, and two that willWhite cast is a filter question, not a brand question. Five Korean sunscreens with their filter lists read out, including the two that will show on camera.
- Skincare under makeup: what pills, what slides, and what to layer insteadBase makeup that rolls off or slides at noon is usually a layering problem, not a foundation problem. Five Korean products read for what sits under makeup well.