What does the serum feel like?

It has a thin, watery texture that feels closer to a hydrating essence than a rich serum. It absorbs quickly without leaving a sticky or heavy finish.

How many drops should I use, and where does it go in my routine?

Apply 3–4 drops as an early step after cleansing and before toner, then gently pat or massage until absorbed. A wipe-off toner may be used first; toner applied by hand should follow the serum. Continue with the rest of your routine once it has absorbed.

Can I use it in the morning, or is it intended for nighttime use?

It may be used daily in the morning or evening, although KLAIRS primarily recommends it as a nighttime treatment.

Is the formula fragrance-free?

Yes. KLAIRS labels the current formula fragrance-free.

What gives the serum its blue color, and can the shade vary?

Its blue tone comes from naturally derived guaiazulene. Slight shade variation can occur without affecting product quality.

How is the Youth Activating Drop different from Midnight Blue Calming Cream?

Youth Activating Drop is a lightweight dual-peptide serum focused on visible lines and texture. Midnight Blue Calming Cream is a cream primarily intended for soothing and calming care.

How long should I use the bottle after opening?

Use it within approximately six months after opening. Keep the lid tightly closed and store the bottle in a cool, shaded place.

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KLAIRS

Midnight Blue Youth Activating Drop Serum

Q: Is it suitable for sensitive skin?

The serum is listed for all skin types, including sensitive skin, and carries non-comedogenic and sensitive-skin test claims.

What it is: A leave-on, water-like facial serum that supports smoother-looking texture and visible lines while helping soothe stressed-looking skin.

Dual-peptide care for visible lines
Water-light, quick-absorbing finish
Soothing care with guaiazulene
Supports skin hydration

Net weight: 20 ml

Midnight Blue Youth Activating Drop Serum

20ml ·$23.99 USD

Dual-peptide care for visible lines

Water-light, quick-absorbing finish

Soothing care with guaiazulene

Supports skin hydration

Main active: sh-Oligopeptide-1 (EGF)
Intensity: Supportive

PRODUCT DETAILS

Hello, blue hour. Midnight Blue Youth Activating Drop is a leave-on facial serum designed as an early, water-like step for visible lines, uneven texture and soothing care. KLAIRS now calls it EGF Blue Youth Activating Drop; it is the same Blue-line peptide serum under an updated name.

At its center is dual-peptide care for visible lines and smoother-looking texture. sh-Oligopeptide-1 (EGF) supports care focused on newer fine lines, while sh-Polypeptide-1 (bFGF) supports the appearance of deeper-set wrinkles. Adenosine rounds out the smoothing story with care for a softer-looking skin surface.

The blue tone comes from naturally derived guaiazulene, an ingredient that brings soothing care for stressed or sensitized-looking skin. Slight variation in the serum's shade can occur without affecting its quality.

Despite the serum name, the feel is closer to a hydrating essence: its thin, watery texture absorbs quickly without a sticky or heavy finish. The fragrance-free formula is suitable for all skin types, including sensitive skin, and carries non-comedogenic and sensitive-skin test claims.

Learn more

GOES WELL WITH

30 Seconds Quick Bubble Mask Clear$28.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Eye Cream$22.99 USD

1025 Dokdo Lotion$14.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

2-Step Propolis Energy Active Ampule Mask$15.99 USD

1025 Dokdo Cream$24.99 USD

See how the serum supports smoother-looking texture, a calmer appearance and hydration without a heavy finish.

Smoother-looking lines and texture
Soothing care for stressed-looking skin
Lightweight hydration

Key Ingredients

A glossy, translucent peach-toned abstract form with soft sculpted folds and small droplets, resting on a seamless blush background.

sh-Oligopeptide-1 (EGF)

A cosmetic peptide used in smoothing-focused care to help soften the appearance of fine lines.

sh-Polypeptide-1 (bFGF)

A cosmetic peptide that helps soften the appearance of deeper-set wrinkles for a smoother-looking complexion.

A translucent blue-violet abstract folded form with two small droplets, resting on a pale blush surface against a softly lit peach backdrop.

Guaiazulene

A skin-calming cosmetic ingredient used to support a calmer-looking, more comfortable complexion.

Pleated lavender paper fan with a coral-red edge on a pale blush surface.

Adenosine

A skin-conditioning ingredient commonly used to help skin look smoother and soften the appearance of fine lines.

Abstract still life of glossy deep-blue translucent droplets beside a sculpted muted-plum form on a pale blush surface.

Blueberry Fruit Extract

A berry-derived botanical extract that helps nourish lips.

Glycerin

A classic humectant that helps skin hold water and feel softer and smoother.

Real Results

46.5%Less visible redness after physical stimulation within 3 minutes^{1, 2}
10%Increase in skin hydration after 4 weeks^{1, 2}
11.5%Improvement in skin texture after 3 days^{1, 2}
28.3%Reduction in sebum after 4 weeks^{1, 2}

View all 9 real results

5.8%

Person applying serum beside displayed elasticity, hydration and facial-lifting figures.

Concerns & Benefits

Your Concerns

1
Fine Lines Wrinkles
When visible lines and uneven texture leave your skin looking less smooth.
2
Irritation Sensitivity
When external stressors leave your skin looking sensitized or unsettled.

How To Use

1After cleansing, use the serum as an early routine step before toner. If you use a wipe-off toner, it may come first; toner applied by hand should follow the serum.
2For a whole-face application, spread 3–4 drops evenly over clean facial skin.
3For targeted care, apply it to selected areas such as the forehead, around the eyes or mouth, or between the brows. You may add an extra drop where more care is wanted.
4Gently pat or massage the serum until absorbed.
5Once absorbed, continue with the rest of your skincare routine; no separate waiting period is required.
6

Frequently asked questions

Is EGF Blue Youth Activating Drop the same product as Midnight Blue Youth Activating Drop?

Yes. KLAIRS confirms that EGF Blue Youth Activating Drop is the updated name for the same Blue-line peptide serum previously called Midnight Blue Youth Activating Drop.

Customer reviews

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5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

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30 Seconds Quick Bubble Mask Clear$28.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

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KLAIRS Midnight Blue Youth Activating Drop Serum

KLAIRS

Midnight Blue Youth Activating Drop Serum

What it is: A leave-on, water-like facial serum that supports smoother-looking texture and visible lines while helping soothe stressed-looking skin.

Dual-peptide care for visible lines
Water-light, quick-absorbing finish
Soothing care with guaiazulene
Supports skin hydration

Net weight: 20 ml

Midnight Blue Youth Activating Drop Serum

20ml ·$23.99 USD

Dual-peptide care for visible lines

Water-light, quick-absorbing finish

Soothing care with guaiazulene

Supports skin hydration

Main active: sh-Oligopeptide-1 (EGF)
Intensity: Supportive

PRODUCT DETAILS

Learn more

GOES WELL WITH

30 Seconds Quick Bubble Mask Clear$28.99 USD

5 PDRN Hyaluronic Acid Vital Hydrating Hydrogel Mask$12.99 USD

1025 Dokdo Cleanser$11.99 USD

1025 Dokdo Eye Cream$22.99 USD

1025 Dokdo Lotion$14.99 USD

1025 Dokdo Sleeping Pack$15.99 USD

2-Step Propolis Energy Active Ampule Mask$15.99 USD

1025 Dokdo Cream$24.99 USD

See how the serum supports smoother-looking texture, a calmer appearance and hydration without a heavy finish.

Smoother-looking lines and texture
Soothing care for stressed-looking skin
Lightweight hydration