Isntree
Isntree Hyaluronic Acid Fresh Sun Serum SPF 50+ PA++++
Ingredient analysis and how the ad lines read
Read on 2026-09-01
What is this product?
Isntree's Hyaluronic Acid Fresh Sun Serum SPF 50+ PA++++ is for anyone who hates the weight of sunscreen: five chemical UV filters covering UVB and UVA in a watery serum that sinks in fast, over a stack of up to nine hyaluronic acid forms plus squalane, allantoin and ectoin, with no fragrance and no essential oil. Isntree's own shop page shows no Korean ingredient list, no pH and no clinical test for it.
What makes it different?
Most daily sunscreens are creams built on a single hyaluronic acid. This one is an organic-filter-only serum that layers five chemical UV filters over an unusually dense multi-weight hyaluronic acid stack, so the hydration step and the sun step collapse into one lightweight layer.
What is in it?
The full ingredient list as the brand publishes it, in the printed order. Each name links to what we know 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.
Did the ad claims hold up?
We checked 3 lines this product advertises against the ingredient list and public documents. One of them holds up. The rest are only partly right or have nothing behind them.
backed by evidence1
- The hydrating serum texture enables quick absorption to the skin and leaves a refreshing, moisturizing finish.
likely, not proven1
- Formulated with Squalane, Allantoin and Ectoin that deliver intense moisture to the skin and help strengthen the skin barrier.
partly backed1
- A sun serum with a broad spectrum of SPF 50+ PA++++ helps protect the skin from UV rays.
Each line is quoted as the brand published it, and each one was read on its own against the ingredient list and the documents the brand publishes.
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.