It is best for shoppers looking for a lightweight first serum with a gentle, firmness-focused approach.

Klairs EGF Blue Youth Activating Drop bottle with dropper showing a blue serum drop on a white background

Klairs EGF Blue Youth Activating Drop official EGF repair serum graphic with bottle and blue serum bubbles

Official Klairs graphic explaining why skin needs EGF with blue water texture and molecule artwork

Official Klairs graphic showing how EGF repairs the look of post-blemish marks in three illustrated steps

Official Klairs before-and-after graphic about visible post-blemish marks over four weeks

Klairs EGF Blue Youth Activating Drop key ingredients graphic with blue dropper and ingredient callouts

Klairs EGF serum comparison graphic with bottle, blue bubbles, and texture notes

Klairs EGF Blue Youth Activating Drop how-to-use tips graphic with serum drop and pipette icons

Klairs EGF Blue Youth Activating Drop color variation guide showing blue and gray serum drops

Klairs recommended routine graphic featuring EGF Blue Youth Activating Drop with toner and cream steps

Klairs EGF Blue Youth Activating Drop ingredient list graphic with bottle, box, and INCI text

Klairs EGF Blue Youth Activating Drop bottle with dropper and blue serum on a white background

Klairs EGF Blue Youth Activating Drop bottle and dropper with a blue serum drop on a white background

Klairs EGF Blue Youth Activating Drop bottle beside black product box on a pale blue background

DETAILS

💙 50 mL: Get Free Shipping & a Free Gift (Blue Drop 10 mL + Blue Calming Cream 20 g)
💙 20 mL: Get Free Shipping & a Free Gift (Blue Calming Cream 20 g)

Featured by Song Of Skin (TikTok @songofskin)

1. Highlights
- Korea's #1 EGF Serum: A viral sensation at Olive Young, famous for its high repurchase rate and selling one bottle every 4 seconds.
- 3-Min Instant Calming: Delivers rapid relief for irritated skin, making it the perfect emergency solution for redness & acne.

- Post-Acne Mark Recovery: Targets and fades stubborn blemish marks and pigmentation, restoring a clear and even skin tone.
- Weightless First-Step Serum: A non-sticky, water-based formula that absorbs instantly—ideal for oily and acne-prone skin routines.

2. Value Proposition
- Ultimate Recovery with Maximum Strength: Formulated with 10ppm EGF—the highest concentration allowed by Korean MFDS—and bFGF to powerfully rebuild a resilient skin barrier from within.
- Intense Soothing Power: Infused with 1,000ppm Guaiazulene, this natural herbal powerhouse provides immediate relief and deep calming for sensitized skin.
- Clean & Safe for All: A 100% fragrance-free, non-comedogenic formula that ensures intensive care without clogging pores or irritating even the most sensitive, acne-prone skin.

HOW TO USE

Step 01. Apply 3-4 drops directly after cleansing, before your toner, to ensure maximum absorption.
Step 02. Gently pat into the skin to promote its natural recovery ritual.
Step 03. Pro Tip: Use on a cotton swab for concentrated care on stubborn blemish spots.

INGREDIENTS

Water, Butylene Glycol, sh-Oligopeptide-1, sh-Polypeptide-1, Vaccinium Angustifolium (Blueberry) Fruit Extract, Lecithin, Sorbitan Sesquioleate, 1,2-Hexanediol, Caprylyl Glycol, PEG-60 Hydrogenated Castor Oil, Glycerin, Chlorphenesin, Guaiazulene, Ethylhexylglycerin, Adenosine

FAQ

Q. What kind of serum is this?

A. This is an early anti-aging first serum designed to be used at night, right after cleansing and before toner.

Q. How do I use it?

A. Apply 3 to 4 drops to clean skin after cleansing, then let it absorb before moving on to the rest of your routine.

Q. What makes it different from a typical firming serum?

A. It combines EGF and bFGF peptides with guaiazulene and adenosine in a lightweight, watery formula that fits easily into a sensitive-skin routine.

Q. Is it fragrance-free?

A. Yes, this formula is fragrance-free.

Q. Who is it best for?

A. Sensitive-feeling skin, post-blemish look, early firmness care, and shoppers who want a lightweight blue first serum.

Review Highlights

Shoppers often mention the watery, essence-like texture and quick absorption.
The blue color and lightweight feel make it memorable in nighttime routines.
Many shoppers like it as a gentle first serum before heavier products.
Some shoppers who prefer richer serum textures may want to layer it with a moisturizer.

Best For / Not For

Best For

Sensitive-feeling skin wanting lightweight peptide care
Skin that looks stressed or uneven after blemishes
Night routines that start with a watery first serum
Shoppers who prefer fragrance-free skincare

Not For

Shoppers who want a rich, cushiony serum texture
Anyone looking for a leave-on exfoliating acid serum
Soy-sensitive shoppers who avoid lecithin

Ingredient Spotlight

EGF + bFGF Peptides

What it is: Two peptides used in a watery first-serum format.

Why it is here: Support the product's firmness-focused, well-aging identity.

Routine role: The main first-serum care story.

Guaiazulene

What it is: The blue-tone ingredient associated with Klairs Blue Line.

Why it is here: Gives the serum its signature blue identity and calming angle.

Routine role: Supports a sensitive-skin friendly blue routine.

Adenosine

What it is: A well-known skincare ingredient used for firmness-supporting care.

Why it is here: Complements the peptide story.

Routine role: Rounds out the night serum step.

Routine Pairing

Use as the first serum step after cleansing.
Apply 3 to 4 drops and let the watery texture absorb.
Follow with toner, serum, cream, or a simple moisturizer depending on your routine.
Use at night if you prefer a dedicated well-aging step.
Keep vitamin C or retinol-style routines separated if your skin is easily reactive.

Save 25%

EGF Blue Youth Activating Drop | EGF Peptide Serum

Q: Is there anything to note before use?

This formula contains lecithin, so shoppers with soy sensitivities should review the ingredient list carefully before use.

$29.99

$29.99 ~~$39.99~~ 25% OFF

Shipping calculated at checkout.

EGF Blue Youth Activating Drop is a lightweight first serum for sensitive-feeling skin routines focused on early firmness care, post-blemish look, and visibly stressed skin. The watery formula features EGF and bFGF peptide care with guaiazulene and adenosine in a fast-absorbing texture that fits after cleansing and before toner or the rest of your routine. It is designed for shoppers who want a thin, non-sticky serum step rather than a rich oil or heavy firming product. The blue tone comes from guaiazulene, and color changes may occur naturally without changing the product quality. Use 3 to 4 drops on clean skin at night or as your first treatment step, then follow with toner and moisturizer. The formula is fragrance-free and suitable for sensitive-skin routines.

Option: 50 mL

50 mL 20 mL 10 mL

FEATURED IN

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DETAILS

HOW TO USE

INGREDIENTS

Payment & Security

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FAQ

Q. What kind of serum is this?

A. This is an early anti-aging first serum designed to be used at night, right after cleansing and before toner.

Q. How do I use it?

A. Apply 3 to 4 drops to clean skin after cleansing, then let it absorb before moving on to the rest of your routine.

Q. What makes it different from a typical firming serum?

A. It combines EGF and bFGF peptides with guaiazulene and adenosine in a lightweight, watery formula that fits easily into a sensitive-skin routine.

Q. Is it fragrance-free?

A. Yes, this formula is fragrance-free.

Q. Who is it best for?

A. Sensitive-feeling skin, post-blemish look, early firmness care, and shoppers who want a lightweight blue first serum.

Review Highlights

Shoppers often mention the watery, essence-like texture and quick absorption.
The blue color and lightweight feel make it memorable in nighttime routines.
Many shoppers like it as a gentle first serum before heavier products.
Some shoppers who prefer richer serum textures may want to layer it with a moisturizer.

Best For / Not For

Best For

Sensitive-feeling skin wanting lightweight peptide care
Skin that looks stressed or uneven after blemishes
Night routines that start with a watery first serum
Shoppers who prefer fragrance-free skincare

Not For

Shoppers who want a rich, cushiony serum texture
Anyone looking for a leave-on exfoliating acid serum
Soy-sensitive shoppers who avoid lecithin

Ingredient Spotlight

EGF + bFGF Peptides

What it is: Two peptides used in a watery first-serum format.

Why it is here: Support the product's firmness-focused, well-aging identity.

Routine role: The main first-serum care story.

Guaiazulene

What it is: The blue-tone ingredient associated with Klairs Blue Line.

Why it is here: Gives the serum its signature blue identity and calming angle.

Routine role: Supports a sensitive-skin friendly blue routine.

Adenosine

What it is: A well-known skincare ingredient used for firmness-supporting care.

Why it is here: Complements the peptide story.

Routine role: Rounds out the night serum step.

Routine Pairing

Use as the first serum step after cleansing.
Apply 3 to 4 drops and let the watery texture absorb.
Follow with toner, serum, cream, or a simple moisturizer depending on your routine.
Use at night if you prefer a dedicated well-aging step.
Keep vitamin C or retinol-style routines separated if your skin is easily reactive.

At a glance

EGF Blue Youth Activating Drop

Targets Texture, early firmness, post-blemish look

Skin feel Watery, lightweight, fast-absorbing

Routine step First serum, after cleansing

Formula note Fragrance-free, contains lecithin

Proof points

Sensitive-skin peptide care, in clear facts

4.9

Average rating across 451 verified reviews.

Fragrance-Free · Vegan

Formulated for sensitive-skin routines.

EGF + bFGF

Two peptides in a watery first-serum format.

3 cards now fill the full width with no dead space.

Why this serum

A calm, watery first step for stressed skin

Watery texture

Absorbs quickly with no heavy finish, easy to layer.

Peptide care

EGF and bFGF give the formula its firmness-focused angle.

Calming blue tone

Guaiazulene gives the signature blue and a soothing story.

Night-routine friendly

Use as the first step at night, before toner and moisturizer.

Skin fit

Best for / Not for

Best for

Sensitive-feeling skin wanting lightweight peptide care.
Skin that looks stressed or uneven after blemishes.
Night routines that start with a watery first serum.
Shoppers who prefer fragrance-free skincare.

Not for

Those who want a rich, cushiony serum texture.
Anyone looking for a large-volume serum.
Soy-sensitive shoppers who avoid lecithin.

Key ingredients

Peptides, calming blue care, firmness support

Ingredient names become the visual system: large CSS typography, ghost letterforms, and real HTML text that stays crawlable and responsive.

sh-Oligopeptide-1

EGF

Defines the serum's early anti-aging, peptide-care positioning.

sh-Polypeptide-1

bFGF

A supporting peptide paired with EGF in this lightweight formula.

Calming blue tone

Guaiazulene

Gives the product its blue identity and a calming angle.

Firmness support

Adenosine

A well-known ingredient used for firmness-supporting care.

Build your routine

Prep, treat, and seal

Large line icons keep the routine consistent across products without depending on matching photography.

Step 1 · Prep

Cleanse

Start with a gentle cleanser so the watery serum absorbs into clean skin.

Step 2 · Treat

Apply Blue Drop

Use 3 to 4 drops as your first treatment step, then let it absorb.

Step 3 · Seal

Moisturize

Follow with toner and moisturizer to keep the routine balanced.

Watery serum texture
First-serum routine step
Layering with moisturizer
Creator routine examples

@songofskin @songofskin @songofskin

How it works

The mechanism graphics, full size

The core mechanism graphic sits in a full-width contain-fit module. Every line stays readable and the supporting facts also appear as real HTML text.

Klairs Blue Drop how EGF repairs post-blemish marks graphic

How it works

EGF peptide care for post-blemish skin

The formula is positioned for skin that needs support after blemishes, with peptide care and a watery, fast-absorbing feel.

Results

Before and after, full size

The verified four-week graphic gets its own contain-fit module instead of being cropped inside a small card.

Post-blemish look

Visibly more even after 4 weeks

Supports skin that looks uneven after blemishes, in a lightweight format made for sensitive routines.

Verified claim · consented imagery

Klairs Blue Drop visibly fades post-blemish marks in 4 weeks graphic

FAQ

Questions shoppers ask

What kind of serum is this?

An early anti-aging first serum designed for night use, right after cleansing and before toner.

How do I use it?

Apply 3 to 4 drops to clean skin, let it absorb, then continue with the rest of your routine.

What makes it different from a typical firming serum?

It pairs EGF and bFGF peptides with guaiazulene and adenosine in a lightweight, watery formula made for sensitive skin.

Is it fragrance-free?

Yes, this formula is fragrance-free.

Anything to note before use?

It contains lecithin, so shoppers with soy sensitivities should review the ingredient list first.

Why does the blue color vary?

The blue color comes from guaiazulene, a naturally derived ingredient. Natural color variation may occur, and the product quality is not affected.

Customer review evidence

I used the whole bottle happily! I loved that it was more of an essence texture and I loved the blue color...

This Midnight Blue Youth Activating Drop has helped my skin so much...

This is a blue tinted serum that is lightweight and has a water like texture...

The Klairs midnight blue youth activating drops are a great part of my skincare...

I have been a huge fan of Dear, Klairs...

I have very sensitive acne prone skin and this helps to visibly calm everything!

EGF Blue Youth Activating Drop | EGF Peptide Serum

$29.99

$29.99 ~~$39.99~~ 25% OFF

Language

DETAILS

HOW TO USE

INGREDIENTS

FAQ

Review Highlights

Best For / Not For

Ingredient Spotlight

Routine Pairing

EGF Blue Youth Activating Drop | EGF Peptide Serum

EGF Blue Youth Activating Drop | EGF Peptide Serum

DETAILS

HOW TO USE

INGREDIENTS

FAQ

Review Highlights

Best For / Not For

Ingredient Spotlight

Routine Pairing

EGF Blue Youth Activating Drop

Sensitive-skin peptide care, in clear facts

4.9★

Fragrance-Free · Vegan

EGF + bFGF

A calm, watery first step for stressed skin

Watery texture

Peptide care

Calming blue tone

Night-routine friendly

Best for / Not for

Best for

Not for

Peptides, calming blue care, firmness support

EGF

bFGF

Guaiazulene

Adenosine

Prep, treat, and seal

Cleanse

Apply Blue Drop

Moisturize

The mechanism graphics, full size

EGF peptide care for post-blemish skin

Before and after, full size

Visibly more even after 4 weeks

Questions shoppers ask

What shoppers say about Blue Drop

EGF Blue Youth Activating Drop | EGF Peptide Serum

Product Comparison

EGF Blue Youth Activating Drop | EGF Peptide Serum

Choose your option

EGF Blue Youth Activating Drop | EGF Peptide Serum

EGF Blue Youth Activating Drop | EGF Peptide Serum

4.9