Koi-Gokujyun Perfect Gel
Koi-Gokujyun Perfect Gel
Product Description
Product overview
A luxurious 5-in-1 all-in-one gel moisturizer that replaces your toner, serum, emulsion, cream, and mask. Formulated with 4 types of Hyaluronic Acid, Ceramide, Squalane, and Sacran to deliver intense, long-lasting hydration deep into the stratum corneum for plump, bouncy "mochi skin."
5-in-1 Multi-Function
Combines toner, serum, emulsion, cream, and mask benefits in one product for a simplified routine.
Texture & feel
SENSORY5-in-1 Multi-Function
Combines toner, serum, emulsion, cream, and mask benefits in one product for a simplified routine.
4 Types of Hyaluronic Acid
Multiple molecular weights penetrate different skin layers for deep and surface hydration.
Ceramide Complex
Glucosylceramide strengthens the skin barrier and locks in moisture for all-day protection.
Sacran (Aphanothece Sacrum)
Unique Japanese algae extract holds 5x more moisture than hyaluronic acid for superior hydration.
Safety & compatibility
SAFEContains no retinoids, salicylic acid, hydroquinone, or chemical sunscreens. Safe for expecting and nursing mothers.
Contains Arginine and Glycerin which may feed Malassezia in the presence of lipids. Some users report breakouts. Patch test recommended.
Rated 1/5 for pore-clogging potential. Oil-free base suitable for acne-prone skin in most cases.
Free from fragrance, alcohol (ethanol), mineral oil, and colorants. Formulated at skin-friendly pH.
Ingredient breakdown
INGREDIENTS4 Types of Hyaluronic AcidProven
A multi-molecular weight complex including Super Hyaluronic Acid (Acetyl HA), regular HA, Nano-sized HA, and Skin-Adsorbing HA that hydrate different layers of the skin.
- Super HA: Modified with acetyl groups to anchor to skin surface for longer-lasting hydration
- Hydrolyzed HA: Low molecular weight penetrates deeper into the stratum corneum
- Research: Studies show HA can hold up to 1000x its weight in water
Glucosylceramide (Ceramide)Proven
A plant-derived ceramide precursor that helps repair and strengthen the skin barrier while locking in moisture.
- Function: Reinforces the skin's lipid barrier to prevent transepidermal water loss (TEWL)
- Research: Ceramides are essential components of healthy skin, comprising 50% of the stratum corneum
SqualaneProven
A lightweight, non-comedogenic emollient that mimics the skin's natural sebum for balanced hydration without greasiness.
- Source: Plant-derived (typically from olives or sugarcane)
- Research: Non-irritating even at 100% concentration; excellent for sensitive skin
Sacran (Suizenji-Polysaccharide)Promising
A unique polysaccharide extracted from Aphanothece sacrum, a Japanese freshwater algae. Holds significantly more moisture than hyaluronic acid.
- Function: Creates a protective moisture film on the skin surface
- Capacity: Can hold up to 5,000-6,000x its weight in water
Hydrolyzed CollagenPromising
Small collagen peptides that help improve skin elasticity and firmness while providing hydration.
- Function: Supports skin structure and helps maintain plumpness
- Research: Topical collagen primarily acts as a humectant; penetration is limited
27 ingredients
Water, Butylene Glycol, Glycerin, Hydroxyethyl Urea, Pentylene Glycol, PPG-10 Methyl Glucose, Triethylhexanoin, Squalane, Ammonium Acryloyldimethyltaurate/VP Copolymer, Behenyl Alcohol, Sodium Acetylated Hyaluronate (Super Hyaluronic Acid), Sodium Hyaluronate, Hydrolyzed Hyaluronic Acid (Nano-sized Hyaluronic Acid), Hydroxypropyltrimonium Hyaluronate (Skin-Adsorbing Hyaluronic Acid), Hydrolyzed Collagen, Glucosylceramide (Ceramide), Aphanothece Sacrum Exopolysaccharides (Sacran), Dimethicone, PPG-17 Buteth-17, Triethyl Citrate, Cyclopentasiloxane, Phenoxyethanol, Disodium Succinate, Dimethicone Crosspolymer, Agar, Disodium EDTA, Succinic Acid, Alpha-Glucan, Ammonium Acrylates Copolymer, Methylparaben
Where it fits in your routine
ROUTINEAs a 5-in-1 product, this gel can replace your toner, serum, emulsion, cream, and mask. Apply directly after cleansing. Layer with sunscreen in AM or use as a sleeping mask at night.
How to use
HOW TO USECleanse Your Face
Start with clean, slightly damp skin after using your favorite cleanser.
Scoop Out Product
Take a quarter-size amount (about a pearl-sized dollop) of gel into your palm.
Apply & Massage
Gently massage the gel onto your face in upward circular motions until fully absorbed.
Extra Care (Optional)
Apply additional product to areas of concern like around eyes and mouth for a pack/mask effect.
Who is it for?
WHOPerfect for you if:
- You want a simplified, multi-step routine in one product
- Your skin is dehydrated or lacks moisture
- You live in a humid climate and prefer lightweight hydration
- You're pregnant or breastfeeding and need safe options
- You have sensitive skin and need fragrance-free products
- You want to achieve that "mochi skin" bouncy look
Consider alternatives if:
- You have active fungal acne (Malassezia folliculitis)
- Your skin is extremely dry and needs heavy occlusives
- You prefer a matte finish rather than dewy
- You're sensitive to silicones (contains dimethicone)
- You prefer preservative-free formulas (contains methylparaben)
Skin type compatibility
SKIN TYPESLightweight gel texture absorbs well without heavy greasiness. May feel slightly dewy initially but balances T-zone throughout the day.
Provides excellent hydration. Very dry skin may need to layer with an occlusive or heavier cream on top, especially in winter.
Ideal match! Hydrates dry areas without making oily zones greasy. Balances well across different face zones.
Fragrance-free, alcohol-free, and pH-balanced. Minimal irritation potential. Contains soothing ceramides.
Low comedogenic rating (1/5). Some users report breakouts due to certain ingredients. Patch test recommended for fungal acne sufferers.
Results timeline
8+ WEEKSInstant Hydration Boost
Skin feels plump, bouncy, and moisturized immediately after application. Dewy "glass skin" effect visible.
95% of users noticedImproved Moisture Retention
Skin barrier strengthens, reducing dryness and flakiness. Skin texture becomes smoother and more supple.
80% of users noticedEnhanced Skin Elasticity
Noticeable improvement in skin firmness and bounce. Fine dehydration lines appear reduced. Overall healthier complexion.
70% of users noticedLong-Term Barrier Health
Sustained hydration levels with consistent use. Skin appears more resilient and recovers faster from environmental stress.
65% of users noticedRatings by platform
6K+ REVIEWSPros & cons
BALANCEDPraised
- Excellent value - large 100g jar at affordable price
- Simplifies routine with 5-in-1 functionality
- Lightweight yet deeply hydrating formula
- Fragrance-free and gentle on sensitive skin
- Creates bouncy, plump "mochi skin" effect
- Perfect for humid climates and summer use
- Absorbs quickly without heavy residue
- Safe for pregnancy and breastfeeding
Criticized
- Jar packaging less hygienic than pump/tube
- May not be enough for very dry skin alone
- Can feel slightly tacky if too much is applied
- Not suitable for all fungal acne sufferers
- Contains methylparaben (concern for some users)
- Packaging entirely in Japanese
- Some report breakouts with prolonged use
Budget-friendly alternatives (dupes)
DUPESContains hyaluronic acid in a lightweight gel-cream formula. Fragrance-free version available. Widely accessible at drugstores but lacks the 4 types of HA and ceramides.
K-beauty alternative with hyaluronic acid focus. Contains niacinamide for additional brightening. Slightly richer texture but fungal acne safe formula.
The original version of this product. Similar 5-in-1 concept with 3 types of HA instead of 4. Slightly less intense hydration but more widely available internationally.
Comparison with competitors
SIDE-BY-SIDEStorage & shelf life
12 MONTHS12 months after opening
Store in a cool, dry place away from direct sunlight. No refrigeration required.
Jar with screw-top lid. Consider using a spatula to maintain hygiene.
Yes, 100g is under TSA liquid limit. Secure lid tightly to prevent leakage.
Frequently asked questions
FAQYes! This gel is safe for use during pregnancy and breastfeeding. It contains no retinoids, salicylic acid, hydroquinone, or chemical sunscreen ingredients that are typically advised against during pregnancy. The formula is fragrance-free and uses gentle, well-tolerated ingredients. As always, consult with your healthcare provider if you have specific concerns.
Use with caution. While some databases list the Gokujyun Perfect Gel as fungal acne safe, the Koi (concentrated) version contains Arginine and higher levels of Glycerin which may feed Malassezia yeast in the presence of lipids. Some users with fungal acne have reported breakouts. We recommend patch testing first if you have a history of fungal acne.
Yes! This gel works well as a hydrating step in routines with active ingredients. Apply your actives first (vitamin C in AM, retinol or acids in PM), wait for them to absorb, then apply the Perfect Gel. The hyaluronic acid and ceramides can help buffer potential irritation from actives while maintaining hydration.
This gel is best suited for combination, normal, and sensitive skin types. It's particularly excellent for dehydrated skin that needs moisture without heaviness. Oily skin types can use it in humid conditions, while very dry skin may need to layer an occlusive on top. It's ideal for those living in humid climates or anyone wanting a simplified skincare routine.
Immediate hydration is noticeable right after application. Within 1-2 weeks of consistent use, you should notice improved moisture retention and softer skin texture. For visible improvements in skin elasticity and firmness, expect to see results in 4-6 weeks. Long-term barrier health benefits become apparent after 8+ weeks of regular use.
As a 5-in-1 all-in-one product, it can be used directly after cleansing as your complete skincare step. If you prefer a multi-step routine, apply it after cleansing and any watery essences/serums, but before heavier occlusives or sunscreen. In the PM, you can use it as the last step or as a sleeping mask by applying a generous layer.
The comedogenic rating is 1/5, meaning it has a low likelihood of clogging pores. The formula is lightweight and absorbs well. However, individual reactions vary - some users have reported breakouts, particularly those with fungal acne or sensitivity to certain ingredients like silicones. We recommend patch testing if you have acne-prone skin.
The product has a PAO (Period After Opening) of 12 months. Once opened, use within one year for best results and safety. Since it comes in a jar, we recommend using a clean spatula rather than your fingers to scoop out product, which helps prevent contamination and extends the product's usable life.
Verdict: The Hada Labo Koi-Gokujyun Perfect Gel is an exceptional value for anyone seeking intense hydration in a simplified routine. Its 5-in-1 functionality, affordable price point, and thoughtful formulation with 4 types of hyaluronic acid make it a standout J-beauty product. Perfect for combination to sensitive skin types and safe for pregnancy. The main drawbacks are the jar packaging and potential issues for fungal acne sufferers. Overall, it delivers on its promise of creating bouncy, plump "mochi skin" and is a worthy addition to any hydration-focused skincare routine.
Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 1 |
Water
Solvent, Skin Conditioning
|
|
|
| 1 |
Butylene Glycol
Solvent, Skin Conditioning, Masking, Fragrance, Humectant, Viscosity Controlling, Viscositydecreasing Agent
|
Hydrating
|
|
| 1 |
Hydroxyethyl Urea
Humectant, Skin Conditioning, Hair Conditioning
|
Hydrating
|
|
| 2 |
Glycerin
Solvent, Perfuming, Fragrance, Humectant, Viscosity Decreasing Agent, Hair Conditioning, Skin Protecting, Denaturant, Skin Conditioning
|
Promotes Wound Healing
Hydrating
|
|
| 1 |
Pentylene Glycol
Solvent, Skin Conditioning
|
|





