4.7
Average rating across 536 verified reviews.
EGF Blue Youth Activating Drop | EGF Peptide Serum
EGF Blue Youth Activating Drop | EGF Peptide Serum
Want a firmer, bouncier-looking finish without a harsh, stingy active? A gentle peptide 'drop' that layers easily — low-drama, everyday firmness care.
Regular price
$39.99
Sale price
$39.99
Regular price
$39.99
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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 has no added fragrance and is suitable for sensitive-skin routines.
Skin type: normal, combination, sensitive. Form: serum. Type: EGF peptide serum. Color: blue. Style: K-beauty, cooling care.
Helps comfort skin that looks flushed, warm, or stressed while keeping the routine gentle. Fits a barrier-supporting routine when skin needs simple, steady comfort. Dear Klairs is cruelty-free.
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The mechanism graphics, full size
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.
Before and after, full size
Visibly more even after 4 weeks
Supports skin that looks uneven after blemishes, in a lightweight format made for sensitive routines.
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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.
Does it have added fragrance?
It has no added fragrance. It contains guaiazulene, a chamomile-derived ingredient that gives the serum its blue color, so patch test first if you are sensitive to botanical ingredients.
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.
Where EGF Blue Youth Activating Drop | EGF Peptide Serum fits in a Klairs routine
Top: targeted care
Bottom: hydration and comfort
Left: daily essentials
Right: focused treatment steps
Daily prepCleanse, tone, mist, and simple first layers.
Targeted careSerum, pad, vitamin, and blue-line focused steps.
Hydration baseLightweight daily comfort and flexible layering.
Routine setCream, mask, and complete routine pairings.
Unscented Toner
Vitamin PDRN
Blue Cream
EGF Blue Youth Activating Drop | EGF Peptide Serum
Targeted bounce
A focused blue routine step
EGF Blue Youth Activating Drop | EGF Peptide Serum fits into blue calming and resilient-looking care routines alongside daily hydration, targeted care, and complete Klairs routine sets.
- 1Best for: Skin that looks stressed, sensitized, tired, or ready for a more focused calming routine.
- 2Routine role: Layer after toner or toner pads when you want a targeted blue step before moisturizer.
- 3Pair with: Pair with EGF Blue Calming Toner Pad, Blue Calming Mist, or Midnight Blue Calming Cream.
PrepCleanse, tone, or mist depending on your routine start.
TreatLayer the product where its texture and role fit best.
FinishSeal with cream, sunscreen, or a routine set step.
Find your Klairs routine match
Explore Klairs picks by hydration, soothing, barrier, glow, texture, and after-sun routine needs.
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Customer Reviews
Overall rating: 4.7 / 5 from 536 reviews.
My skin has just been off for a while. Dehydrated, texture, dull, etc. I’ve been trying to find something that would just help support my barrier. I kept hearing about this serum and thought I’d give it a shot. I’ve been using it for about a week now and my skin just feels better overall. I’ve cut out everything and just been using this along with the fundamental mist and midnight blue calming cream and have seen much improvement in just a week. I’ll continue to see how it goes but so far I’m quite confident in the product.
I absolutely love this Blue Youth Activating Drop serum, its truly amazing, its so lightweight, absorbs like a dream and it pairs incredibly well with all of my other skincare products, from gentle to the strongest actives I use, super soothing, super gentle and love to use it specially after using spicule products because I feel like helps my skin regenerate and the next morning I wake up with such a wonderful glow. I cannot imagine my routine without this soothing serum anymore, I am currently in my second bottle and I get even more and more obsessed with each use. I love that it has EGF and Guaiazulene to keep my skin soothed and calmed and always happy plus it doesn't leave any sticky residue after it dries, it is a super liquid serum so I do recommend be careful because if you dispense the serum too fast is gonna just slide down your face so take your time and pat pat pat to make sure that all of the EGF goodness gets fully absorbed by your skin, absolutely in love with this EGF blue youth activating drop serum and I just can see myself getting more and more when I run out of the one I am currently using plus I have already recommended this soothing blue serum to all of my friends and family and I will continue to do so because its truly that amazing. I LOVE this serum soooo sooo sooo much!!!
Texture like water, has a pretty blue color due to ingredient and has no scent. Fast-absorbing, light and not sticky. Feels very hydrating on my combination, normal to dry, skin. Keeps it plump, soft and supple. I like how it can calm irritated or stressed skin and able to reduce redness. This product encourages cell turnover while still gentle enough for people with sensitive skin. Being a woman in my 40s, this is an effective anti-aging serum. The peptides in it improved elasticity and minimized fine lines. Also faded some dark spots/acne scars. Only complaint is the dropper seems incapable of getting filled halfway or more.
This product will be a staple in my arsenal after I experienced EGF's skin-rejuvenating effects. After experiencing chemical burns and treating them initially with the EGF mist, I incorporated the EGF drops into my routine, and my skin healed with no scarring left behind. The texture is watery and light, and it absorbs quickly into the skin. It has also helped reduce pigmentation on newer acne scars. I will never be without this product in my routine, and I can now understand why it is such a hot seller. Great job dear, Klairs!
This serum is lightweight yet so hydrating and calming. Exactly everything my skin needs in this bottle. Don’t walk, Run to buy this product! 💙
Its amazing I Love it Its perfect
I am absolutely thrilled with the Dear, Klairs Midnight Blue Youth Activating Drop. This highly concentrated serum absorbs rapidly and adds a wonderful radiance and luminosity to the skin. It noticeably improves skin elasticity, stimulates collagen production, and helps reduce the appearance of fine lines and wrinkles. The formula works by encouraging reparative cellular activity to replenish and renew the complexion. I would definitely recommend this anti-aging treatment for achieving a smoother, more youthful look!
I had to steal these back from my teen for this picture. I use the sprayer and it's so perfect. It's making my skin tone even and slowly fading my melasma! I keep handing out the little duo kits of this stuff out to my daughter's friends for acne. They're all freaking out because even if they aren't religious about using it day and night, they're still seeing positive changes. I'm going to buy some more little duo kits since I'm running out!
Its perfect for me, I have to upload my video for now I'm taking care of my baby but I love the results of the serum thank you for thinking of us
Its perfect I Love it. And Your pack its beautifull Love This its perfect for my skin
The Dear Klairs Blue Youth Activating Drop is such a wonderful product if you want to keep your skin looking youthful and fresh without dealing with harsh or heavy ingredients. It has a super light, watery feeling that sinks into your skin in just a few seconds, so you never have to worry about any sticky or oily residue sticking around. What makes it so special is how quickly it calms down redness and makes tired skin look instantly well rested and healthy. With regular night use, your face feels noticeably softer, smoother, and much firmer, giving you that bright and bouncy glow everyone wants. It is incredibly gentle, easy to use right after washing your face, and works like a dream under your favorite moisturizer to bring your natural radiance back to life.
Absolutely love this serum. I'm familiar with this brand and products and I'm always impressed with my results. This is a great product for anti-aging and overall skin health. It's soothing and calming. I love it!
The Blue Youth Activating Drop has a very lightweight, water-like texture that absorbs quickly without feeling sticky or heavy. I apply 3–4 drops immediately after cleansing, before toner and moisturizer. My main concerns are firmness and early signs of aging, while my skin can also feel dehydrated and stressed. The serum feels gentle and calming, leaving my skin smoother, refreshed and comfortably hydrated. I will continue using it consistently to evaluate its longer-term effect on firmness, texture and overall skin appearance.
I tried using this serum to brighten up dullness, but it ended up targeting something 🙄completely different first: skin barrier recovery. While it didn't directly fade hyperpigmentation, rebuilding and calming the barrier made a massive difference in how quickly post-sun redness and sunburn healed. When your barrier is damaged from sun exposure, skin can look dark, inflamed, and patchy. By deeply soothing the skin and calming that underlying irritation, the sunburn recovered much faster, leaving the complexion looking far healthier and naturally clearer overall—even without active brightening ingredients!🫶🏻✨
I've been using the Klairs Midnight Blue Youth Activating Drop, and my skin feels more hydrated, smoother, and healthier. The texture is lightweight, absorbs quickly, and doesn't feel sticky. It layers well with the rest of my skincare routine.
The Dear, Klairs EGF Blue Youth Activating Drop feels lightweight, absorbs quickly, and leaves my skin soft, hydrated, and refreshed. I love how it gives my skin a smooth, healthy-looking glow without feeling sticky or heavy.
I really love this blue EGF drop so much because it’s full of EGF and Its watery texture that can fit easily, and I mean super super easily, to my routine morning and night.
I am really loving this EGF blue youth activating drop serum, it’s super light and super easy to absorb, leaves no residue at all, is literally as if the skin would completely drink it, absorbs like an absolute dream and it has been just sooo good for my acne prone, sensitive skin, I was dealing with a little red skin and this serum soothed it and helped my skin go back to a more calm state. Haven’t used it long enough to see any long term results specially with acne scars but I am excited about it because this is a truly beautiful serum and I am expecting great results. Will repurchase and absolutely recommend to everyone 🤩🤩🤩🤩🤩
I really liked this formula, I liked how late wait it was but I did not like how watery it was. So far this feels really good on my skin it absorbs really well, and I don't have any breakouts.
This serum has been a huge help in repairing my skin barrier. As someone who uses exfoliating products weekly, I often experience extra skin sensitivity and redness. I’ve noticed that by using this EGF serum in my daily routine, my skin doesn’t feel raw and tight anymore. I have less irritation and my skin feels more calm. I love that this is non-comedogenic so it’s safe for acne prone skin. This is a very lightweight serum and there is no fragrance added. If you have very sensitive skin, I highly recommend trying this serum to help sooth your skin and strengthen your skin barrier.
I truly appreciate about the serum is its fragrance free, lightweight,non-greasy texture. It absorbs quickly into the skin, leaving no residue behind, making it perfect for both morning and evening skincare routines. After several weeks of consistent use, I noticed a visible improvement in my skin's texture and firmness. It also helped fade some of my post-acne dark spots.
The EGF Blue Youth Activating Drop has been an absolute game-changer for my skincare routine. Its lightweight, fast-absorbing texture delivers an incredible boost of hydration while noticeably improving overall skin elasticity, texture, and smoothness. I love how gentle yet effective the formula is, leaving my skin looking deeply nourished, radiant, and firm with a healthy, youthful glow. It’s a staple I genuinely trust and love sharing with my audience!
I absolutely love the Dear, Klairs EGF Blue Youth Activating Drop! It has a lightweight, fast-absorbing texture that leaves the skin feeling deeply hydrated, plump, and remarkably smooth without any heaviness. Plus, the fun blue tint from natural ingredients makes the skincare routine feel extra special and luxurious.
It’s very watery and very nice on my skin. I love it so much.
I have been using this product for over a month now I’m starting my second bottle soon as you can see from the vdo. I have a few of disport stock up because I love it so much and I’m afraid it will run out of stock. Highly recommend for everyone.
I love this product so much. I use it every day morning and night for my sensitive skin. It helps calm down my break out and redness. And it’s so easy to add in my skincare routine. Love it!
This serum has changed my skin, the acnes are disappearing faster and I feel it much more hydrated.
I’m on my second bottle and this absolutely amazing. It’s helped minimize my breakouts and my acne scars are fading. I’ll always have this in my routine this is a 10/10 product
A lightweight serum that absorbs quickly without feeling sticky. It keeps my skin hydrated, smooth, and looking healthier. Great for strengthening the skin barrier and suitable for sensitive skin.
I loved using the Dear Klairs EGF Blue Youth Serum. This product was extremely effective in offering comforting soothing hydration, the formula absorbs incredibly well. It left my skin looking and feeling more resilient and radiant. This is a serum I would continuously use and it's gentle enough for daily use. I love that deep blue color of this serum and just how well it works in helping all my skin goals be achieved. Dear Klairs has some fabulous products and they continue to raise the bar with each new line!
The Dear Klairs EGF Blue Youth Activating Drop has been a great addition to my routine. It feels light on the skin, absorbs fast, and gives my skin a hydrated, refreshed look. I love how gentle it feels, especially when my skin needs a little extra care.
I’ve been using the Dear Klairs EGF Blue Youth Activating Drop, and I love how lightweight and soothing it feels. The watery texture absorbs quickly, layers well with other products, and leaves my skin feeling hydrated and calm. It’s fragrance-free and perfect for days when my skin feels stressed or sensitive
I really like this serum, its lightweight, watery texture feels refreshing on the skin and layers effortlessly with other products. I've noticed that it helps keep my skin calm while also controlling breakouts.
I've been impressed by how lightweight and fast-absorbing the EGF Blue Youth Activating Drop feels. It layers beautifully in my routine without any stickiness and leaves my skin feeling calm, hydrated, and smooth. With continued use, I've noticed my skin looks more resilient, refined, and healthy, making it a great addition to my barrier-support and anti-aging routine. I also love that it's gentle enough for sensitive skin while helping improve overall skin texture and radiance.
the hype is realllllll. I love love love klairs EGF serum it has a lightweight, watery texture that absorb instantly without feeling sticky. My skin feels calmer, smoother, and more hydrated after using it consistently, and I love that it's fragrance free and layers beautifully with the rest of my routine.
This is one of the best serums I used . And many other serums are somtines too harsh or just not for my skin type this works really well. I highly recommend this product.
It feels like water, absorbs instantly, and has left my skin looking incredibly plump, smooth, and radiant. I love applying it right after cleansing to instantly soothe my skin and wake up with a serious glow.
After using the whole bottle, I’ve come to the conclusion that I like the product, but I don’t love it. I do think that it does a good job at calming my skin, but it’s very watery. I like my serums to have a little bit more body to them as this had a very similar consistency to a toner. Also, I don’t think it did much to smooth out fine lines. However, it was a good serum to use as a base before laying others on top. Overall, it was nice but not something I would reach for again.
The Klairs midnight blue youth activating drops are a great part of my skincare. They apply easily and they're gentle enough to be layered with a moisturizer. My skin always feels nice and soft the next morning and I can see the improvement of fine lines around my mouth (smile lines). I look forward to keeping these drops in my skincare routine.
I used the whole bottle happily! I loved that it was more of an essence texture and I loved the blue color. I enjoyed using it as the first part of my skin routine to prep my skin for other serums. Peptides are great for the skin and the product is made in Korea. It felt luxurious to use. I recommend!
