Skip to content

Polyglutamic Acid Hydrating Serum

Polyglutamic Acid Hydrating Serum

Product Description

Product overview

Made in UK INDIE

A lightweight, silky hydrating serum featuring 3% Polyglutamic Acid Complex that holds 4x more moisture than Hyaluronic Acid. Creates a breathable film on the skin's surface to lock in hydration, smooth fine lines, and provide the perfect makeup base.

Vegan Certified Cruelty-Free Clean at Sephora Fragrance-Free Paraben-Free Pregnancy Safe Silicone-Enriched
Pregnancy
Yes
Fungal Acne
No
Comedogenic
1/5
Size
30ml / 1.01 fl oz
Price
$15.00
pH Level
6.0 - 7.0
Key Active
3% PGA Complex
Concern
Hydration
Real reviews · YouTube Shorts
Why it's different

4x Hydration Power

Polyglutamic acid holds four times more moisture than hyaluronic acid, creating intense surface hydration.

01

Texture & feel

SENSORY
Consistency
Silky Gel
Scent
Subtle Chemical
Absorption
Fast (30 sec)
Finish
Dewy/Blurring

4x Hydration Power

Polyglutamic acid holds four times more moisture than hyaluronic acid, creating intense surface hydration.

Film-Forming Technology

Creates a breathable, invisible film that locks in moisture while preventing trans-epidermal water loss.

Perfect Makeup Base

Silky primer-like finish smooths skin texture and creates an ideal canvas for foundation application.

Fine Line Plumping

Instantly plumps the appearance of fine lines and wrinkles through intense surface hydration.

02

Safety & compatibility

SAFE
Pregnancy & Breastfeeding Safe

Contains no retinoids, salicylic acid, hydroquinone, or chemical sunscreens. Confirmed safe by The Inkey List.

Not Fungal Acne Safe

Contains Polysorbate 80 and Sorbitan Oleate which can feed Malassezia yeast. Avoid if prone to fungal acne.

Low Comedogenic Risk

Rating 1/5. Silicone-based formula is unlikely to clog pores for most skin types.

Silicone Content Note

Contains dimethicone and other silicones. May cause pilling when layered with incompatible products.

03

Ingredient breakdown

INGREDIENTS

Polyglutamic Acid 3%Proven

A high-molecular-weight amino acid polymer derived from fermented soybeans (natto). Works as a powerful humectant that forms a hydrating film on the skin's surface.

  • Mechanism: Creates a moisture-retaining barrier that prevents trans-epidermal water loss
  • Research: Studies show PGA can hold up to 5,000x its weight in water
  • Benefit: Works on the skin's surface (unlike HA which penetrates deeper)
Pro tip: Layer over Hyaluronic Acid for multi-level hydration - HA hydrates deeper layers while PGA seals moisture at the surface.

Invisaskin Complex 2%Proprietary

A proprietary hydration-boosting complex that supports long-lasting moisture retention and smoother skin texture.

  • Function: Maintains hydration levels throughout the day
  • Result: Supports the film-forming action of polyglutamic acid

Dimethicone HighProven

A lightweight silicone that creates a protective, non-greasy barrier. Responsible for the silky, primer-like texture.

  • Function: Occlusive that prevents moisture loss and smooths skin
  • Benefit: Creates the blurring, makeup-ready finish
  • Safety: Non-comedogenic, sits on skin surface
May cause pilling when layered with water-based products. Apply as the last serum step before moisturizer.

Glycerin StandardProven

A classic humectant that attracts water to the skin. Works synergistically with polyglutamic acid for enhanced hydration.

  • Research: One of the most studied and effective humectants
  • Function: Draws moisture from the environment into the skin

Rice Bran Extract TracePromising

Oryza Sativa (Rice) Bran Extract provides antioxidant benefits and helps soothe and brighten the skin.

  • Benefits: Contains ferulic acid and other antioxidants
  • Traditional use: Long history in Asian skincare for brightening

25 ingredients

Aqua (Water), Dimethicone, Butylene Glycol, Bis-PEG-12 Dimethicone, Glycerin, Polymethylsilsesquioxane, Polysilicone-11, Phenoxyethanol, Polyglutamic Acid, Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Isohexadecane, Propanediol, Coco-Glucoside, Sodium Benzoate, Hydroxyethylcellulose, Polysorbate 80, Ethylhexylglycerin, Potassium Sorbate, Decyl Glucoside, Dimethylacrylamide/Acrylic Acid/Polystyrene Ethyl Methacrylate Copolymer, Sorbitan Oleate, Trisodium Ethylenediamine Disuccinate, Caprylyl Glycol, Hexylene Glycol, Oryza Sativa (Rice) Bran Extract.

FREE FROM: Parabens, Sulfates (SLS/SLES), Mineral Oil, Phthalates, Formaldehyde, Hydroquinone, Triclosan, Coal Tar, Oxybenzone, Added Fragrance, Alcohol (Denat.), Essential Oils
04

Where it fits in your routine

ROUTINE
1
Cleanser
2
Toner
3
HA Serum
4
PGA Serum
5
Moisturizer
6
SPF (AM)

Use AM & PM as your last serum step before moisturizer. For best results, layer over a hydrating toner or hyaluronic acid serum to seal in moisture.

05

How to use

HOW TO USE
1

Cleanse & Prep

Start with clean skin. Apply your toner and any water-based serums (like Hyaluronic Acid) first while skin is still slightly damp.

2

Apply PGA Serum

Dispense a pea-sized amount onto fingertips. Gently pat and press into face and neck, avoiding the eye area.

3

Wait & Layer

Allow 30 seconds for absorption before applying moisturizer. The silky finish indicates the product has set.

4

Makeup Hack (Optional)

Mix a pea-sized amount into your foundation for a dewy, long-wearing finish, or use alone as a hydrating primer.

06

Who is it for?

WHO

Perfect for you if:

  • You have dehydrated skin that needs surface-level moisture
  • You want a hydrating primer that works under makeup
  • Fine lines and wrinkles are a concern
  • You love a dewy, plump skin finish
  • You're pregnant or breastfeeding
  • Your skin tolerates silicones well
  • You want to seal in your Hyaluronic Acid serum

Consider alternatives if:

  • You have fungal acne (Malassezia folliculitis)
  • You're sensitive to silicones or experience pilling
  • You prefer completely fragrance-free products (has slight chemical scent)
  • You have very oily skin and dislike dewy finishes
  • You prefer lightweight, water-based formulas only
  • You need deep hydration (this works on surface only)
07

Skin type compatibility

SKIN TYPES
Dry Skin
Excellent

Ideal for dry skin. The film-forming action locks in moisture and prevents water loss. Layer over a hydrating serum for maximum benefit.

Oily Skin
Good

Lightweight and non-greasy. Works well as a makeup primer. Some oily skin types report excellent results, though finish may be too dewy for some.

Combination Skin
Excellent

Balances hydration across different zones without adding heaviness. Fast absorption prevents congestion in oilier areas.

Sensitive Skin
Good

Fragrance-free and gentle formula. However, patch test recommended as some users report sensitivity to the silicones or scent.

Acne-Prone Skin
Moderate

Low comedogenic rating (1/5), but NOT fungal acne safe. Contains polysorbates that can feed Malassezia. Avoid if you have fungal acne.

08

Results timeline

4-6 WEEKS
Immediately

Instant Smoothing & Hydration

Skin feels immediately softer and smoother with a silky, primer-like finish. Fine lines appear temporarily plumped.

95% noticed instant smoothing
1-2 Weeks

Improved Moisture Retention

Skin maintains hydration better throughout the day. Dehydration lines become less noticeable. Makeup wears better and longer.

80% reported better moisture retention
4-6 Weeks

Visible Texture Improvement

With consistent use, overall skin texture appears smoother and more refined. Fine lines show sustained improvement.

70% saw texture improvement
09

Ratings by platform

2K+ REVIEWS
Amazon
4.4
Rating
1,300+
Reviews
Main complaint: Strong chemical-like scent that some find unpleasant
Sephora
4.2
Rating
500+
Reviews
Main complaint: Pilling with certain products when layering
Ulta Beauty
4.3
Rating
350+
Reviews
Main complaint: Small bottle size for the price point
Brand Website
4.6
Rating
800+
Reviews
Main complaint: Some users didn't notice dramatic hydration difference
10

Pros & cons

BALANCED

Praised

  • Excellent makeup primer - creates smooth, dewy base
  • Lightweight yet effective hydration
  • Can be mixed into foundation for extra glow
  • Pregnancy and breastfeeding safe
  • Affordable price point for the technology
  • Vegan and cruelty-free certified
  • Fast-absorbing, non-sticky formula
  • Works well layered over Hyaluronic Acid

Criticized

  • Strong chemical-like scent (despite being fragrance-free)
  • Can pill when layered with certain products
  • Small 30ml bottle for $15
  • Not fungal acne safe
  • Some find finish too dewy/tacky
  • Works on surface only, not deep hydration
  • May not suit those sensitive to silicones
11

Budget-friendly alternatives (dupes)

DUPES
85% Match
Hyaluronic Acid 2% + B5 Serum
$8.90
Budget Pick

Different humectant (HA vs PGA) but similar hydration goals. Works deeper in skin while PGA works on surface. More watery texture, less primer-like finish. Fungal acne safe with 2024 reformulation.

70% Match
Indeed Labs Snoxin II
$24.99
Similar Price

Contains polyglutamic acid with peptides for anti-aging. Similar silky texture and smoothing effects. More targeted at wrinkle reduction than pure hydration.

65% Match
Hyaluronic Acid 5%
$16.00
Similar Price

Multi-weight HA formula for comprehensive hydration. More lightweight, water-based texture without the silicone finish. Better for layering without pilling concerns.

12

Comparison with competitors

SIDE-BY-SIDE
Pycnogenol 5%
Key Ingredient 2% Hyaluronic Acid (5 forms)
Size 30ml
Texture Watery Gel
Fungal Acne Safe Yes (2024 formula)
Best For Deep Hydration, All Skin Types
The 6 Peptide Skin Booster Serum
Key Ingredient 6 Peptides + Niacinamide
Size 150ml
Texture Light Essence
Fungal Acne Safe Check Formula
Best For Anti-Aging, Firming
Serum
Key Ingredient Multi-Weight Hyaluronic Acid
Size 50ml
Texture Lightweight Serum
Fungal Acne Safe Yes
Best For K-Beauty Fans, Layering
13

Storage & shelf life

12 MONTHS
Period After Opening (PAO)

12 months after opening

Storage

Store in a cool, dry place (15-25°C/59-77°F). Keep out of direct sunlight.

Packaging

Squeeze tube with flip-top cap - hygienic dispensing, minimal air exposure

Travel Friendly

Yes - 30ml is under 100ml liquid limit for carry-on luggage

13

Frequently asked questions

FAQ

Yes! The Inkey List confirms this product is safe during pregnancy and breastfeeding. It contains no retinoids, salicylic acid, hydroquinone, or chemical sunscreen filters. All ingredients are pregnancy-compatible, making it an excellent hydrating option for expecting or nursing mothers.

No, this product is NOT fungal acne safe. It contains Polysorbate 80 and Sorbitan Oleate, which are known to feed Malassezia yeast. If you're prone to fungal acne or pityrosporum folliculitis, consider alternatives like The Ordinary Hyaluronic Acid 2% + B5 (2024 formula) which is fungal acne safe.

Yes! Polyglutamic Acid is compatible with most actives including retinol, vitamin C, niacinamide, and AHA/BHA acids. In fact, it works great as a final hydrating step to seal in these actives and buffer potential irritation. Apply water-based actives first, then layer PGA on top before moisturizer.

This serum works best for dry, dehydrated, combination, and normal skin types. It's particularly excellent for those who want a hydrating makeup primer. Oily skin types may find it works well too, though some prefer less dewy finishes. Not recommended for fungal acne-prone skin due to certain ingredients.

You'll notice instant smoothing and a silky finish immediately after application. Improved moisture retention typically becomes noticeable within 1-2 weeks of consistent use. For visible texture improvement and fine line reduction, allow 4-6 weeks of daily AM and PM use.

Apply as your last serum step, after cleansing, toning, and any water-based serums (like Hyaluronic Acid). Follow with moisturizer and SPF in the morning. The silicone-rich formula works best when applied over water-based products to seal in hydration. Can also be used as a primer directly before makeup.

This product has a low comedogenic rating of 1/5 and is unlikely to clog pores for most people. The silicone-based formula sits on the skin's surface rather than penetrating pores. However, it's not suitable for fungal acne due to polysorbate content. Always patch test if you're acne-prone.

The product has a PAO (Period After Opening) of 12 months. Store in a cool, dry place away from direct sunlight to maintain efficacy. The squeeze tube packaging helps minimize air exposure and contamination, extending the product's shelf life compared to jar packaging.

— Skincarisma verdict
4.3 / 5 ★★★★☆

Verdict: The Inkey List Polyglutamic Acid Serum delivers on its promise of intense surface hydration and makes an excellent makeup primer at an accessible price point. The 3% PGA complex genuinely holds moisture better than many hyaluronic acid serums, creating that coveted "glass skin" effect. However, it's not without flaws - the chemical-like scent bothers some users, pilling can occur with certain product combinations, and it's unfortunately not safe for those with fungal acne. Best suited for dry, dehydrated, or combination skin types who want a multi-tasking hydrator that doubles as a primer. For maximum results, layer it over a hyaluronic acid serum to get both deep and surface hydration. A solid choice for the price, especially for The Inkey List fans already familiar with the brand's no-frills approach to effective skincare.

Product Overview

question
lightbulb What are Quick Product Notes?

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.

muscle Pro Tip Alert!

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.

Awesome, I Understand!

Quick Product Notes

Click on icons for more information
question
lightbulb What are Notable Effects & Ingredients?

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.

muscle Pro Tip Alert!

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

Awesome, I Understand!

Notable Effects & Ingredients

brightening Brightening from 1 ingredient(s):
Glycerin
wound Promotes Wound Healing from 2 ingredient(s):
Glycerin Polyglutamic Acid
question
lightbulb What are Ingredients Related to Skin Type?

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.

muscle Pro Tip Alert!

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!

Awesome, I Understand!

Ingredients Related to Skin Types

Click on icons for more information
dry-skin Dry Skin
2
oily-skin Oily/Acne-Prone Skin
sensitive-skin Sensitive Skin
question
lightbulb What is the Ingredient Safety Breakdown?

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.

muscle Pro Tip Alert!

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.

Awesome, I Understand!

Ingredient Safety Breakdown

EWG Health Ratings
Low risk
Medium risk
High risk
Unknown risk
60% 16% 24%

Product ingredient list

Showing first 5 of 25 ingredients
EWG CIR Ingredient Name & Cosmetic Functions Notes
1 Unknown
Water
Solvent, Skin Conditioning
3 A
Dimethicone
Skin Conditioning, Emollient, Antifoaming Agent, Skin Protecting
1 A
Butylene Glycol
Solvent, Skin Conditioning, Masking, Fragrance, Humectant, Viscosity Controlling, Viscositydecreasing Agent
Hydrating
0 Unknown
Bis-PEG-12 Dimethicone
Emollient, Skin Conditioning
2 A
Glycerin
Solvent, Perfuming, Fragrance, Humectant, Viscosity Decreasing Agent, Hair Conditioning, Skin Protecting, Denaturant, Skin Conditioning
brightening Brightening
Promotes Wound Healing
Hydrating
VIEW ALL INGREDIENTS