The Inkey List
The Inkey List Lactic Acid Serum
Key Features
- Per the brand: holds 4x more moisture than hyaluronic acid
- Per the brand: plumps skin and reduces fine line appearance
- Polyglutamic acid derived from fermented soybean
- Per the brand: vegan and fragrance-free
- Designed for dehydrated and sensitive skin
The Inkey List Lactic Acid Serum is a 30 ml hydrating serum formulated with polyglutamic acid, an ingredient derived from fermented soybean.
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From
$8.76
at eBay · also stocked at 2 other retailers
Last price update was: Sep 11, 2026, 5:17 AM
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Highlights
Description
The Inkey List Lactic Acid Serum is a 30 ml hydrating serum formulated with polyglutamic acid, an ingredient derived from fermented soybean. Per the brand, this serum can hold four times as much moisture as hyaluronic acid and works as both a humectant to draw water into skin and a film-former to seal it in. The formula contains 3% polyglutamic acid complex alongside hyaluronic acid.
The brand positions this serum for those with dehydrated, tight, or irritated skin, noting that breakouts can sometimes stem from dehydration rather than oiliness. Per the brand, polyglutamic acid may plump the skin, reduce the appearance of fine lines, and deliver a dewy finish while also offering brightening and anti-ageing benefits. Retailer listings list it as suitable for all skin types, sensitive skin, and dry skin.
This is a hydrating serum rather than an active exfoliant, despite its category placement. Per the brand, it is fragrance-free and vegan. It's designed to layer into a routine after other serums and before moisturiser to seal in hydration.
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How to use
- Apply a pea-sized amount to clean skin
- Use after your regular serums and before moisturiser
- Apply morning and evening, or follow label instructions
- Use as part of a multi-step hydrating routine
Good to know
- The brand suggests this suits all skin types, including sensitive and dry skin
- Per the brand, dehydration can sometimes cause breakouts and tight skin, which this serum aims to address
- Layer this after lighter serums and before heavier moisturisers to seal in hydration
- Per the brand, this is vegan and fragrance-free; patch-test first if you have reactive skin
- Contains hyaluronic acid, a humectant that works alongside polyglutamic acid
- Can be used both morning and evening as part of your regular routine
FAQs
What makes polyglutamic acid different from hyaluronic acid?
Per the brand, polyglutamic acid can hold four times as much moisture as hyaluronic acid and is absorbed quickly into the skin, making it a more potent hydrating ingredient for dehydrated complexions.
When should I use this in my skincare routine?
Apply this serum after your regular serums and before your moisturiser to seal in hydration. The brand recommends using it both morning and evening as part of a multi-step system.
Is this suitable for sensitive or breakout-prone skin?
Per the brand, this serum suits all skin types and sensitive skin. The brand notes that breakouts or tight skin can sometimes result from dehydration, which this serum is designed to address.
Does this contain fragrance or other irritants?
Per the brand, this serum is vegan and fragrance-free. As with any new product, patch-test first if you have reactive skin.
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