SOS Serum
SOS Serum
Product Description
Product overview
A lightweight, fast-absorbing K-Beauty gel serum powered by Polyglutamic Acid — a humectant with 10× the water-holding capacity of Hyaluronic Acid — combined with Centella Asiatica Leaf Water, a calming multi-botanical complex, and four advanced peptides to deliver instant, lasting hydration, visibly soothe redness, plump fine lines, and restore a radiant, dewy glass-skin glow.
10× Hydration Power (PGA)
Polyglutamic Acid locks in moisture with 10 times the water-holding capacity of Hyaluronic Acid, delivering deep, lasting hydration that visibly plumps the skin.
Texture & feel
SENSORY10× Hydration Power (PGA)
Polyglutamic Acid locks in moisture with 10 times the water-holding capacity of Hyaluronic Acid, delivering deep, lasting hydration that visibly plumps the skin.
Centella Asiatica Cica Base
The formula is built on Centella Asiatica Leaf Water instead of plain water, flooding the skin with cica's calming, barrier-strengthening, and anti-inflammatory benefits from the first drop.
Multi-Peptide Anti-Aging Complex
Acetyl Hexapeptide-8, Palmitoyl Pentapeptide-4 (Matrixyl), Copper Tripeptide-1, and Adenosine work synergistically to stimulate collagen, improve elasticity, and visibly soften fine lines.
Calming Botanical Blend
Witch Hazel, Chamomile, Allantoin, Licorice Root, and Baicalin soothe irritation, reduce redness, and promote an even, luminous complexion without fragrance or harsh actives.
Brightening + Glow
Licorice Root Extract and Fig Fruit Extract work to fade dullness and dark spots, while Squalane adds a subtle luminosity for that signature K-beauty glass-skin glow.
Skin Barrier Reinforcement
Panthenol (Vitamin B5), Beta-Glucan, and Betaine collectively strengthen the moisture barrier, reduce transepidermal water loss, and defend against environmental stressors.
Safety & compatibility
SAFENo retinoids, salicylic acid, hydroquinone, or chemical sunscreens detected. The formula is considered safe during pregnancy and breastfeeding. As always, consult your OB/GYN before adding any new product to your routine.
Contains Cetyl Ethylhexanoate (a fatty acid ester), Polyglyceryl-10 Laurate, and Polyglyceryl-10 Myristate — ingredients that may feed Malassezia yeast. Those with active fungal acne should patch test or consider a dedicated FA-safe alternative.
The formula is largely non-comedogenic. Squalane rates 1/5 at most, and there are no heavy occlusive oils. Suitable for acne-prone and oily skin types.
Completely fragrance-free, alcohol-free, dye-free, and silicone-free. Dermatologist-tested and skin irritation-tested. Allantoin and Panthenol further calm reactive skin.
This serum contains no active exfoliants and pairs well with vitamin C, niacinamide, retinol, and AHA/BHA products. Apply this serum before heavier actives, layering thinnest to thickest.
Witch Hazel Extract appears in the formula. While this version appears alcohol-free (as an extract vs. distillate), very sensitive or rosacea-prone skin should patch test first, as witch hazel can occasionally cause irritation.
Ingredient breakdown
INGREDIENTSPolyglutamic Acid (PGA) Low % / High EfficacyProven
The star humectant of this formula. Polyglutamic Acid is a naturally derived biopolymer (fermented from soybeans) with an exceptional ability to bind and retain water in the skin, reportedly holding up to 10 times more moisture than Hyaluronic Acid. It also forms a breathable film on the skin surface that reduces transepidermal water loss.
- Water retention: PGA's high molecular weight allows it to create a moisture-locking film on the skin surface, preventing evaporation.
- NMF stimulation: Studies indicate PGA can stimulate the skin's own natural moisturizing factor (NMF) production.
- Plumping: Regular use visibly reduces the appearance of fine lines caused by dehydration within 2–4 weeks.
Centella Asiatica Leaf Water Base Ingredient (1st position)Proven
Instead of plain water, TIRTIR uses Centella Asiatica Leaf Water as the primary base of this serum, delivering cica's anti-inflammatory, barrier-repairing, and collagen-supporting benefits from the highest concentration possible. Active centelloids (asiaticoside, madecassoside, asiatic acid) are present throughout the formula.
- Anti-inflammatory: Madecassoside and asiaticoside significantly reduce redness, irritation, and skin reactivity.
- Collagen synthesis: Centella supports new collagen production and strengthens the extracellular matrix.
- Barrier repair: Proven to restore skin barrier function in compromised or sensitized skin.
Multi-Peptide Complex (Acetyl Hexapeptide-8, Palmitoyl Pentapeptide-4, Copper Tripeptide-1, Adenosine) CombinedProven
A four-peptide anti-aging cocktail targeting multiple signs of skin aging simultaneously. Acetyl Hexapeptide-8 relaxes facial tension lines; Palmitoyl Pentapeptide-4 (Matrixyl) stimulates collagen I and III synthesis; Copper Tripeptide-1 promotes wound healing and skin regeneration; Adenosine improves elasticity and reduces wrinkle depth.
- Acetyl Hexapeptide-8: Shown in studies to reduce wrinkle depth by up to 30% with consistent use over 30 days.
- Palmitoyl Pentapeptide-4: Clinically proven to increase collagen, fibronectin, and hyaluronic acid production in dermal fibroblasts.
- Adenosine: Listed as an official anti-wrinkle active in Korean cosmetics regulation.
Glycerin ~3.3–4.9%Proven
A gold-standard humectant naturally found in skin. Glycerin draws moisture from the environment and from deeper skin layers to the surface, improving hydration, softness, and skin barrier function. At the concentration estimated here, glycerin provides meaningful short- and long-term moisturization.
- Comedogenicity: 0/5 — safe for all pore types.
- Barrier support: Helps maintain the skin's lipid structure and reduces TEWL.
- Proven efficacy: A 2016 study found glycerin outperforms AHAs and HA as a humectant at comparable concentrations.
Sodium Hyaluronate ~0.05–0.30%Proven
The salt form of Hyaluronic Acid with a smaller molecular weight that penetrates more effectively into the upper layers of the skin. Works alongside PGA to deliver dual-depth hydration — HA attracts and holds moisture within the skin, while PGA prevents evaporation from the surface.
- Plumping: Visibly reduces the appearance of dehydration lines within hours of application.
- Anti-inflammatory: High-molecular-weight HA has demonstrated anti-inflammatory properties on the skin surface.
Glycyrrhiza Glabra (Licorice) Root Extract Low %Proven
A potent brightening and anti-inflammatory botanical. Licorice root contains glabridin and liquiritin, compounds shown to inhibit tyrosinase (the enzyme responsible for melanin production), helping to fade post-acne marks, sun spots, and uneven skin tone.
- Brightening: Inhibits melanin synthesis by suppressing tyrosinase activity without the irritation of hydroquinone.
- Antioxidant: Flavonoids in licorice neutralize free radicals and protect against UV-induced pigmentation.
- Soothing: Reduces redness and inflammation comparable to hydrocortisone in some studies.
Allantoin + Panthenol (Vitamin B5) Functional %Proven
A classic skin-soothing and barrier-repair duo. Allantoin accelerates cell turnover and skin healing while calming irritation. Panthenol (pro-Vitamin B5) converts to pantothenic acid in the skin, deeply hydrating and promoting regeneration of the protective barrier.
- Allantoin: Keratolytic at higher concentrations, soothing and moisturizing at cosmetic levels. Widely recognized as safe (GRAS).
- Panthenol: Reduces TEWL, improves barrier function, and has demonstrated anti-inflammatory effects in clinical trials.
Squalane Low %Proven
A stable, plant-derived version of the lipid naturally produced by human sebaceous glands. Squalane provides lightweight occlusion and emollient smoothness without greasiness, helping lock in all the water-binding actives beneath it and adding a subtle luminous sheen to the skin.
- Comedogenicity: 1/5 — extremely unlikely to clog pores.
- Stable: Unlike unsaturated oils, squalane does not oxidize on skin, reducing risk of irritation.
- Fungal acne safe: Plant-derived squalane is considered generally safe for fungal acne prone skin.
43 ingredients
Centella Asiatica Leaf Water, Glycerin, Butylene Glycol, Hamamelis Virginiana (Witch Hazel) Extract, 1,2-Hexanediol, Arginine, Carbomer, Cetyl Ethylhexanoate, Caprylyl Glycol, Sophora Flavescens Root Extract, Ficus Carica (Fig) Fruit Extract, Ammonium Acryloyldimethyltaurate/VP Copolymer, C12-14 Pareth-12, Polyglyceryl-10 Laurate, Polyglyceryl-10 Myristate, Camellia Sinensis Leaf Extract, Rosmarinus Officinalis (Rosemary) Leaf Extract, Chamomilla Recutita (Matricaria) Flower Extract, Betaine, Centella Asiatica Extract, Glycyrrhiza Glabra (Licorice) Root Extract, Allantoin, Panthenol, Salix Alba (Willow) Bark Extract, Cucumis Sativus (Cucumber) Fruit Extract, Polygonum Cuspidatum Root Extract, Scutellaria Baicalensis Root Extract, Disodium EDTA, Chamaecyparis Obtusa Water, Spirodela Polyrhiza Extract, Alteromonas Ferment Extract, Illicium Verum (Anise) Fruit Extract, Squalane, Phellinus Linteus Extract, Portulaca Oleracea Extract, Sodium PCA, Beta-Glucan, Sodium Hyaluronate, Polyglutamic Acid, Adenosine, Acetyl Hexapeptide-8, Palmitoyl Pentapeptide-4, Copper Tripeptide-1
Where it fits in your routine
ROUTINEApply after toner on damp skin for maximum absorption. Follow with moisturizer to seal in hydration. Suitable for both AM and PM routines. Can be used under makeup as a dewy base.
How to use
HOW TO USECleanse Thoroughly
Start with a clean, freshly cleansed face. Pat dry with a clean towel, leaving skin slightly damp for better serum absorption.
Apply Toner (Optional)
Layer your toner or essence first to prep the skin. TIRTIR's own Milk Skin Toner pairs exceptionally well as part of the brand's Water Glossy line.
Dispense the Serum
Squeeze 2–3 drops of the SOS Serum into the palm of your hand, or apply directly from the dropper to your fingertips. One bottle typically lasts 2–3 months with daily use.
Pat Gently Into Skin
Press and pat the serum across your face and neck using your fingertips — do not rub. Focus on dry patches, fine lines, or areas of redness. The serum should absorb within 10–15 seconds.
Follow with Moisturizer
Lock in all that hydration with your favourite moisturizer. For glass skin effect, mix one drop of SOS Serum into your foundation or cushion before application.
Who is it for?
WHOPerfect for you if:
- Your skin feels tight, dehydrated, or dull
- You're seeking a fragrance-free, clean formula
- You want to address fine lines without irritating actives
- You have sensitive, reactive, or redness-prone skin
- You love glass-skin or dewy K-beauty aesthetics
- You're pregnant or breastfeeding and need a safe serum
- You want an AM/PM multi-tasking serum for all seasons
Consider alternatives if:
- You have active fungal acne (contains potentially FA-triggering esters)
- You need a high-concentration vitamin C or exfoliating serum
- You require SPF protection (this has none)
- You prefer a completely minimalist, single-active formula
- You have confirmed witch hazel sensitivity
Skin type compatibility
SKIN TYPESThe PGA-powered formula was practically designed for dry skin. Delivers instant relief from tightness and long-lasting hydration — follow with a rich moisturizer for maximum effect.
The lightweight, non-greasy gel texture absorbs quickly without adding shine. Witch hazel helps minimize the appearance of pores. A lightweight moisturizer is sufficient to follow.
Balances hydration across different zones beautifully — plumps dry cheeks and nasolabial folds while staying light enough for the T-zone. One of the best skin types for this product.
Fragrance-free and alcohol-free with powerful calming actives (cica, allantoin, chamomile). Patch test recommended for those very sensitive to witch hazel extract specifically.
Very low comedogenic rating (1/5), fragrance-free and clean formula. However, those with active fungal acne should patch test due to Cetyl Ethylhexanoate content.
The multi-peptide complex (Acetyl Hexapeptide-8, Matrixyl, Copper Tripeptide-1, Adenosine) directly addresses fine lines and loss of elasticity, making this a strong anti-aging serum at its price point.
Results timeline
MONTH 2–3Instant Plumping & Dewy Glow
Skin feels noticeably softer, more supple, and hydrated within minutes of application. The dewy, glass-skin finish is visible immediately — popular as a pre-makeup hydration base.
90% noticed immediate hydration boostRedness Reduction & Calmer Skin
Centella, Allantoin, and Chamomile begin to visibly calm irritation, redness, and reactive patches. Skin feels less reactive and more comfortable throughout the day.
75% report reduced redness within 2 weeksImproved Skin Texture & Tone
Sustained hydration from PGA and HA begins to smooth rough texture and even out skin tone. Licorice root brightening becomes gradually visible. Fine dehydration lines appear more plumped.
68% report improved overall textureVisible Anti-Aging & Brightening Effects
The multi-peptide complex works cumulatively to visibly reduce fine lines and improve elasticity. Skin barrier feels stronger and more resilient. Overall radiance and glow are consistently maintained.
60% notice visible improvement in fine linesRatings by platform
1K+ REVIEWSPros & cons
BALANCEDPraised
- Instantly plumping and hydrating from first use
- Fragrance-free and suitable for sensitive skin
- Lightweight, non-sticky gel texture
- Impressive multi-peptide anti-aging lineup
- Cica-based formula genuinely calms redness
- Works beautifully as a makeup primer base
- Vegan, clean, and free of major irritants
- Generous 50ml bottle for the price point
- Pregnancy and breastfeeding safe formula
Criticized
- Not fully fungal acne safe (Cetyl Ethylhexanoate)
- May need a richer moisturizer over it for very dry skin
- Witch hazel may irritate very reactive or rosacea-prone skin
- Peptide and PGA concentrations not fully disclosed
- No niacinamide for added brightening
- Price can vary significantly across platforms ($20–$43)
Budget-friendly alternatives (dupes)
DUPESAnother K-beauty hydrating serum with five types of hyaluronic acid and cica extract. Slightly simpler formula — no peptides — but exceptional at pure hydration with a similar lightweight, water-gel texture and dewy finish. Great for those focused purely on moisture.
Shares the star active (Polyglutamic Acid) at a much lower price point. Missing the cica leaf water base, botanical calming complex, and peptide cocktail. Great if PGA hydration is the primary goal, but lacks the anti-aging and soothing dimensions of the TIRTIR formula.
A cult K-beauty hydrating essence with snail secretion filtrate for barrier repair, soothing, and hydration. Different active (snail mucin vs. PGA), heavier/slippery texture. Not fungal acne safe. Better for barrier repair and acne marks; the TIRTIR SOS excels at brightening and peptide anti-aging.
Comparison with competitors
SIDE-BY-SIDEStorage & shelf life
12 MONTHS12 months after opening. Note: The expiry date on TIRTIR packaging is listed in DD/MM/YY format — not MM/DD/YY.
Store in a cool, dry place away from direct sunlight and extreme temperatures. Refrigeration optional — many users enjoy the soothing cooling effect.
50ml glass dropper bottle with a precise pipette dropper. Hygienic design minimizes oxidation and contamination. The dropper makes it easy to control the exact amount dispensed.
Yes — 50ml is within TSA carry-on liquid limits (100ml/3.4 oz). Compact and secure for travel. The glass dropper bottle is study but wrap carefully to prevent breakage.
Frequently asked questions
FAQYes — the TIRTIR SOS Serum is considered safe for use during pregnancy and breastfeeding. The formula contains no retinoids (retinol, retinal, tretinoin), no salicylic acid, no hydroquinone, no chemical UV filters, and no high-dose chemical exfoliants. The primary actives are Polyglutamic Acid, Centella Asiatica, glycerin, panthenol, and peptides — all considered safe during pregnancy. As with any new skincare product, we always recommend consulting your OB/GYN or midwife before adding it to your routine while pregnant or nursing.
Use with caution if you have active fungal acne (pityrosporum folliculitis). The formula contains Cetyl Ethylhexanoate (a fatty acid ester), Polyglyceryl-10 Laurate, and Polyglyceryl-10 Myristate — ingredients that can potentially feed Malassezia yeast. If you are currently treating active fungal acne, consider alternatives like the SKIN1004 Madagascar Centella Ampoule or the Torriden DIVE-IN Serum which are considered FA-safe. Once fungal acne is under control, you may be able to reintroduce this serum without issue.
Yes — the TIRTIR SOS Serum contains no active exfoliants and pairs well with most other skincare actives. It layers beautifully under retinol (apply the serum first to buffer the skin), alongside vitamin C (helps enhance antioxidant protection), and after AHA/BHA exfoliants (use the SOS Serum after acids to restore hydration). The Adenosine and Allantoin in the formula actually help calm the irritation that sometimes accompanies strong actives. As always, introduce new combinations gradually and patch test.
The TIRTIR SOS Serum works for all skin types but is most transformative for dry, dehydrated, combination, and mature skin. Dry skin benefits most from the intense PGA + HA hydration. Combination skin loves how it balances moisture evenly across the face. Mature skin responds well to the four-peptide anti-aging complex. Sensitive skin appreciates the fragrance-free, calming formula. Oily skin can use it — the lightweight, non-greasy texture doesn't add shine — though you may prefer to follow with a gel moisturizer rather than a rich cream.
Hydration and plumping effects are visible immediately after the first use — skin feels softer, looks dewier, and fine dehydration lines appear reduced within minutes. Redness reduction and calming effects become noticeable within the first 1–2 weeks of consistent use. Improved texture, more even skin tone (from licorice root), and visible fine line reduction from the peptide complex build over 4–8 weeks of daily use. For best results, use morning and evening as part of your full routine.
Apply the TIRTIR SOS Serum as step 3 in your routine: after cleansing and toning, but before heavier serums, eye cream, and moisturizer. Follow the thin-to-thick layering rule — as a lightweight serum, it should go on before richer creams. In the morning, finish with SPF. In the evening, it can be your last step before moisturizer or facial oil. It can also be mixed into your foundation or cushion as a dewy, glow-boosting base before makeup.
The TIRTIR SOS Serum has a very low comedogenic rating of 1 out of 5. The formula contains no heavy oils known to clog pores — only a small amount of Squalane (comedogenic rating: 1) and lightweight emollients. It is fragrance-free, silicone-free, and mineral oil-free. Most acne-prone skin types tolerate it well. If you are specifically prone to clogged pores, do a 2-week patch test on your cheek or jawline before full-face use.
The TIRTIR SOS Serum has a PAO (Period After Opening) of 12 months. With daily use (2–3 drops AM and PM), a 50ml bottle typically lasts 2–3 months. Important: the expiry date printed on TIRTIR packaging is in DD/MM/YY format — not the American MM/DD/YY format — so check accordingly. Store in a cool, dry place away from direct sunlight and heat for maximum stability and efficacy.
Verdict: The TIRTIR SOS Serum earns its bestseller status through a rare combination of instant gratification and long-term results. Few serums at this price point deliver a Centella Asiatica base, Polyglutamic Acid hydration, and a four-peptide anti-aging complex all in one fragrance-free, clean formula. The dewy, glass-skin finish is immediate and genuinely beautiful. For dry, combination, sensitive, or mature skin seeking a multi-tasking hydrating serum from the K-beauty tradition, this is a compelling and well-formulated choice. The only meaningful caveats are the fungal acne-triggering esters and the lack of full concentration transparency — otherwise, it delivers on nearly every promise it makes.
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Product Overview
Quick product notes are a great way to check if a product is free from commonly avoided ingredients by skincare enthusiasts. These preferences come about for different reasons depending on the ingredient such as personal experiences, sensitivities, health preferences & etc.
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Quick Product Notes
Ever used a product that promised a certain effect but provided no results? It might not have contained any notable ingredients that could have been responsible for that promised effect. It doesn't matter what the marketing or packaging «promises» it can do, if it doesn't contain anything that can help - then the likelihood of it helping is low.
We help you identify key notable ingredients that have been shown to help with effects such as acne-fighting, brightening, UV-protection, wound healing & anti-aging to help you achieve your skincare goals smarter. Please note that different notable ingredients have varying levels of research behind them, some are extremely well proven yet some have mixed research in their efficacy.
Just because a product doesn't contain any notable ingredients doesn't mean it's bad. And a product with notable ingredients (or even many) doesn't necessarily guarantee the efficacy of the product performing these effects either. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine this.
Be smart and use this as just a starting point for you to make more informed and smarter choices and compare it with reviews to see if the product is right for you
Notable Effects & Ingredients
Why are some products great for some people and horrible for others? Well everyone has different skin types and different reactions to the same ingredients.
We've identified a range of ingredients that are commonly regarded as potentially good or bad for those with Dry, Oily/Acne-Prone or Sensitive skin.
A product that contains good or bad ingredients for your skin type doesn't always flat out make the entire product good or bad for your skin. There are other factors such as ingredient quality, concentration and formulation that will ultimately determine your skins reaction.
One of the best ways to use this section is to troubleshoot products you've had bad experiences with in the past. Check if it contains any of the marked ingredients to point out suspect ingredients to avoid in the future!
Ingredients Related to Skin Types
Ingredient Safety Breakdown refers to the percentage % of ingredients in different risk categories as classified by EWG (Environment Working Group) if they are available. There are almost endless cosmetic ingredients and they are one of the few organisations globally that have assigned ratings to a lot of the more commonly used ingredients which is why we reference them.
EWG is seen by many to be more on the alarmist side in their assignment of health ratings resulting in rating ingredients as riskier than they actually are. We recommend using this a reference point rather than a strict guide of ingredient safety and to always do further research if into ingredients that you may find suspect.







