🇩🇪Germany

Dear, Klairs Midnight Blue Youth Activating Drop for mature skin

Rated by Lovi · Unbiased, science-based skincare AI trained on real user outcomes

Dear, Klairs Midnight Blue Youth Activating Drop

High

  • HighNormal Skin Fit
  • HighEffectiveness
  • ExcellentSafety

A great choice for mature skin; a few serums fit it even better.

This fit is calculated for the concerns frequently associated with mature skin: fine lines, wrinkles, and loss of firmness. For scores and recommendations based on your full skin profile, including your 12D face scan results and any goals or preferences you have, please use the Lovi app.

Page built Nov 8, 2026How the Fit score works

Lovi Assistant explains

  • Offers excellent skin rejuvenation for your normal skin, as sh-oligopeptide-1 and adenosine promote skin repair and reduce the appearance of fine lines and wrinkles.
  • The presence of blueberry fruit extract and guaiazulene further supports skin regeneration and provides soothing benefits, enhancing overall skin health.
  • The safety profile is excellent, with no risks of irritation due to the absence of harsh ingredients and the inclusion of soothing components.

How to apply

  • Use this serum in your PM routine. Start by applying it 3 times a week, and work up to daily use if your skin likes it.
  • Apply this serum after your toner and before your moisturizer.
  • Gently press 2-3 drops of the serum into your skin and let it absorb for a minute.
  • You can apply the serum on dry skin for the best results against fine lines.
  • Always do a patch test before your first use and avoid the sensitive eye area.

People Say

★4.4Overall rating based on 1.5k+ reviews

Based on a very large amount of data, this product is widely praised as a lightweight, watery anti-aging serum that absorbs instantly and is exceptionally gentle, making it a favorite for oily and sensitive skin types. Many users report smoother skin texture, reduced redness, and a plump feel. Some find the 20ml bottle too small for the price and note that its preventative anti-aging effects take time to become visible.

Highlights

  • Rapid absorption Mostly Mentioned
    • “absorbs like a dream”
    • “drinks it up instantly”
    • “leaves no residue”
    • “disappears into skin”
  • Small volume/price Mostly Mentioned
    • “finished in 3 weeks”
    • “wish it was bigger”
    • “pricey for the size”
    • “tiny bottle”
  • Gentle formula Often Mentioned
    • “didn't break me out”
    • “no stinging”
    • “safe for reactive skin”
  • Soothing & calming Often Mentioned
    • “calms my redness”
    • “soothing on sensitive skin”
    • “helps with irritation”
    • “great for post-sun”
  • Improves texture Sometimes Noted
    • “skin feels softer”
    • “noticed smoother texture”
    • “woke up glowing”
    • “pores look smaller”
  • Slow visible results Sometimes Noted
    • “didn't see wrinkle reduction”
    • “takes months to work”
    • “more preventative than corrective”
    • “no dramatic difference”
  • Watery consistency Sometimes Noted
    • “runs off my hand”
    • “hard to control dropper”
    • “too thin like water”
    • “spills easily”
  • Not moisturizing Rarely Noted
    • “need moisturizer on top”
    • “feels like just water”
    • “not enough hydration”
    • “must layer quickly”

Sources: lovi.care, iherb.com, sokoglam.com, wishtrend.com, yesstyle.com, reddit.com, and more

Questions and answers

What makes the Midnight Blue Youth Activating Drop a great fit for mature skin?

This treatment is a great fit because sh-oligopeptide-1 and adenosine help repair skin and smooth out fine lines and wrinkles. Blueberry fruit extract and guaiazulene also support skin regeneration and calm the skin, while its gentle formula is unlikely to cause irritation.

International Journal of Cosmetic Science, 2018International Journal of Molecular Sciences, 2026

Which ingredients make this serum a good fit for mature skin?

Sh-oligopeptide-1 and adenosine make this serum a good fit because they help repair skin and reduce the look of fine lines and wrinkles. Blueberry fruit extract and guaiazulene also support skin regeneration and calm the skin.

International Journal of Cosmetic Science, 2018International Journal of Molecular Sciences, 2026

What does EGF do for mature skin?

For mature skin, epidermal growth factor helps smooth fine lines, improve firmness, and support a more youthful look by encouraging skin renewal. It works best when paired with ingredients that deeply hydrate and protect against moisture loss to keep the skin feeling soft and smooth.

Journal of Cosmetic Dermatology, 2013International Journal of Molecular Medicine, 2017

Where does this serum go in a skincare routine for mature skin?

This serum goes in the evening routine after cleansing and before moisturizing, which keeps things simple and safe around sun exposure. It is a great fit for mature skin because peptides and adenosine help repair skin and reduce the look of fine lines, while soothing ingredients keep irritation unlikely.

Can I use this serum with retinol, and in what order?

Yes, you can use this serum with retinol by applying the treatment first and following with your retinol product, or by using them on alternating nights to keep your skin calm. This product is very gentle, but combining two active products may sometimes cause mild dryness if your skin is not used to it.

How often should I use this serum?

This serum is used in the evening as part of your routine for mature skin. It helps repair skin and smooth fine lines with a very low risk of irritation.

Facial Plastic Surgery, 2014International Journal of Cosmetic Science, 2018

Can this serum clog pores, cause breakouts or purging for mature skin?

This serum is unlikely to clog pores, cause breakouts, or lead to purging on mature skin. Its formula avoids harsh ingredients and includes soothing components, giving it a very safe profile without irritation risks.

Is this serum fragrance-free and alcohol-free?

Yes, it has no fragrance and no drying alcohol.

What the research says

  • Adenosine-loaded dissolving microneedle patches showed similar or better efficacy on skin wrinkles, dermal density, elasticity, and hydration compared to adenosine cream in 22 female subjects.

    International Journal of Cosmetic Science, 2018

  • Horse oil-spread and adenosine-loaded dissolving microneedle patches significantly improved skin elasticity, hydration, dermal density, and wrinkles compared with adenosine-loaded dissolving microneedle patches in 20 women without causing adverse events.

    Journal of Cosmetic Dermatology, 2019

  • Topical application of a disodium adenosine monophosphate-based formulation reduced wrinkles and hyperpigmentation while improving hydration, barrier function, skin lifting, and epidermal turnover in female participants.

    International Journal of Molecular Sciences, 2026

  • Pterostilbene at 20 μM protected HaCaT keratinocytes from particulate matter-induced damage by reducing intracellular ROS, inhibiting AHR nuclear translocation, suppressing inflammation and aging protein cascades, and rescuing moisturizing protein expression.

    Antioxidants, 2021

  • Topical epidermal growth factor combined with silver sulfadiazine accelerated the rate of epidermal regeneration and significantly decreased healing time by approximately 1 to 1.5 days across all stages of healing in skin-graft-donor sites of 12 patients compared to silver sulfadiazine alone.

    The New England Journal of Medicine, 1989

  • Topical recombinant human epidermal growth factor combined with ablative fractional carbon dioxide laser significantly improved striae surface texture and showed significantly greater participant satisfaction regarding marked improvement compared to ablative fractional carbon dioxide laser combined with Aloe vera gel in patients with striae alba.

    Lasers in Surgery and Medicine, 2020

  • Topical EGF combined with fractional CO2 laser significantly improves the clinical appearance of atrophic acne scars and decreases skin pigmentation compared to fractional CO2 laser alone in patients with atrophic acne scars.

    The Journal of Clinical and Aesthetic Dermatology, 2022

  • Topical application of PTD-EGF and FGF1 increased cell proliferation and collagen accumulation while protecting against UV-induced damage and improving wrinkle parameters in human skin.

    Journal of Cosmetic Dermatology, 2013

  • Basic fibroblast growth factor-loaded human serum albumin nanoparticles enhanced the proliferation and migration of human dermal fibroblasts, down-regulated myofibroblast-related genes, and accelerated wound healing with enhanced angiogenesis in vivo compared to unstable native forms.

    Journal of Nanobiotechnology, 2023

  • Topical application of basic fibroblast growth factor decreases elevated transepidermal water loss and increases Ki67 expression in keratinocytes following mechanical scratching in a mouse model.

    Skin Pharmacology and Physiology, 2013

  • Applying a topical product containing blueberry extract and Pro-xylane following micro-focused ultrasound significantly improved global aesthetic improvement, skin elasticity, and fine lines compared to standard moisturizer in 50 patients.

    Journal of Cosmetic Dermatology, 2025

  • Topical usage of blueberries may prevent skin damage from environmental stressors by inducing an active skin response against noxious effects.

    Antioxidants, 2023

  • Pretreatment with blueberry extracts prevented ozone-induced ROS production, NLRP1-ASC scaffold formation, and CASP1 and IL-18 transcripts across 2D, 3D, and human skin explant models.

    Oxidative Medicine and Cellular Longevity, 2020

Ingredients

Water, Butylene Glycol, Sh-Oligopeptide-1, Sh-Polypeptide-1, Blueberry Fruit Extract, Lecithin, Sorbitan Sesquioleate, 1,2-Hexanediol, Caprylyl Glycol, Peg-60 Hydrogenated Castor Oil, Glycerin, Chlorphenesin, Guaiazulene, Ethylhexylglycerin, Adenosine

Behind this fit score

Lovi calculates every fit score from the full ingredient list with brand-independent rules our dermatologists and cosmetic chemists build and review, and personalizes every pick with AI trained on the real results of millions of users. Lovi trains its fit score models on a proprietary dataset built from more than 10,000 expert-labeled products and more than 100,000 simulated examples, following an internally consistent methodology presented at Cosmoprof, AMWC, and Skin of Color Update.

  • Nadia Kapleva, MS

    Nadia Kapleva, MS

    Co-founder, Medical Director

    Cosmetic chemist, cosmetologist, aesthetic products developer

  • Alexey Shagraev, PhD

    Alexey Shagraev, PhD

    Co-founder, CEO and CTO

    PhD in computer science, 3x US patent holder, ex-Google, ex-Yandex

  • Dr. Sofía Perea Pérez, MD, MSc

    Dr. Sofía Perea Pérez, MD, MSc

    Medical Board

    Aesthetic medicine practitioner, MSc in Longevity and Anti-Aging Medicine

  • Aishani Shah, MD

    Aishani Shah, MD

    Medical Board

    Specialist dermatologist, MBBS, MD, IFAAD

  • Asya Zubkova, MS

    Asya Zubkova, MS

    Medical Board

    Cosmetic chemist, SCS, IFSCC member

  • Hanna Kurets, MD

    Hanna Kurets, MD

    Medical Board, Medical Advisor

    Dermatology MD

  • Elina Nazarenko, MD

    Elina Nazarenko, MD

    Medical Board

    Dermatology and diagnostic consultant

  • Victoria Derkova, MS

    Victoria Derkova, MS

    Medical Board

    Cosmetic chemist, cosmetic development technologist

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Prices checked 10 Oct – 6 Nov 2026

The Lovi Fit is the same in every country; only the stores and prices differ, and the ones here are for Germany.

How does it fit your skin?

Scan your face, then any product: Lovi shows how well it fits you and what fits even better.

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