Rosemary AHA Night Serum
Rosemary AHA Night Serum
Product Description
Product overview
A gentle yet effective overnight exfoliating serum featuring 9% Lactic Acid, 7% Rosemary Leaf Extract, and 0.5% Succinic Acid to refine pores, smooth skin texture, and reveal a radiant, glass-like complexion by morning.
Gentle Exfoliation
9% Lactic Acid gently removes dead skin cells and refines texture without harsh irritation typical of glycolic acid.
Texture & feel
SENSORYGentle Exfoliation
9% Lactic Acid gently removes dead skin cells and refines texture without harsh irritation typical of glycolic acid.
Soothing Antioxidants
7% Rosemary Leaf Extract provides anti-inflammatory and antibacterial benefits while calming irritated skin.
Blackhead Fighter
0.5% Succinic Acid targets blackheads and regulates sebum without the harshness of salicylic acid.
Triple Hyaluronic Complex
Three forms of Hyaluronic Acid maintain hydration while acids work, preventing the dryness common with AHA products.
Safety & compatibility
SAFEContains 9% Lactic Acid. Most dermatologists recommend AHAs under 5% during pregnancy. Consult your doctor before use.
Contains Hydrolyzed Malt Extract (fermented ingredient) which may feed Malassezia yeast in some individuals.
Very low risk of clogging pores. Water-based formula with no heavy oils or known pore-clogging ingredients.
AHAs increase photosensitivity. Always use SPF 30+ sunscreen the morning after application.
Ingredient breakdown
INGREDIENTSLactic Acid 9%Proven
An alpha hydroxy acid (AHA) derived from milk fermentation. Gentler than glycolic acid with larger molecular size, making it ideal for sensitive skin while still delivering effective exfoliation.
- Function: Exfoliates dead skin cells, promotes cell turnover, improves texture
- Benefit: Also acts as a humectant, helping skin retain moisture
- Research: Proven to stimulate ceramide production and strengthen skin barrier
Rosmarinus Officinalis (Rosemary) Leaf Extract 7%Proven
A powerful botanical extract rich in rosmarinic acid, carnosic acid, and other antioxidants. Provides soothing and antimicrobial benefits.
- Function: Antioxidant, anti-inflammatory, antimicrobial
- Benefit: Calms irritation from acid exfoliation, fights acne-causing bacteria
- Research: Rosmarinic acid shown to reduce inflammation and protect against oxidative stress
Succinic Acid 0.5%Promising
Naturally derived from amber, this gentle acid provides BHA-like benefits for blackhead-prone skin without the potential irritation of salicylic acid.
- Function: Anti-inflammatory, antimicrobial, sebum-regulating
- Benefit: Targets blackheads and reduces pore size without drying skin
- Research: Emerging studies show effectiveness against C. acnes bacteria
Hyaluronic Acid Complex Multi-weightProven
Three forms of hyaluronic acid (Hyaluronic Acid, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate) provide multi-level hydration.
- Function: Humectant that attracts and retains moisture
- Benefit: Counteracts potential dryness from AHA exfoliation
- Research: Can hold up to 1000x its weight in water
25 ingredients
Water, Lactic Acid, Dipropylene Glycol, Glycerin, Butylene Glycol, Methylpropanediol, Sodium Hydroxide, 1,2-Hexanediol, Rosmarinus Officinalis (Rosemary) Leaf Extract, Hydroxyethylcellulose, Succinic Acid, Propanediol, Ethylhexylglycerin, Melia Azadirachta Leaf Extract, Hydrolyzed Gardenia Florida Extract, Hydrolyzed Malt Extract, Hydrolyzed Viola Tricolor Extract, Glyceryl Acrylate/Acrylic Acid Copolymer, Melia Azadirachta Flower Extract, Allantoin, Betaine, Panthenol, Hyaluronic Acid, Hydrolyzed Hyaluronic Acid, Sodium Hyaluronate
Where it fits in your routine
ROUTINEApply to dry, cleansed skin in the PM only. Shake well before use. Follow with hydrating products and always use sunscreen the next morning.
How to use
HOW TO USECleanse & Dry
Wash your face with a gentle cleanser in the evening. Pat skin completely dry - applying to wet skin can increase irritation.
Shake & Dispense
Shake the bottle well to ensure ingredients are properly mixed. Dispense 3-4 drops onto fingertips or palm.
Apply Evenly
Gently spread across face, avoiding eye area and lips. Do not layer with other actives (retinol, vitamin C, other acids).
Build Tolerance
Start with once weekly, gradually increasing to 2-3 times per week. Cleanse with a gentle cleanser the following morning.
Who is it for?
WHOPerfect for you if:
- You want smoother, more refined skin texture
- You struggle with enlarged pores and blackheads
- You prefer gentler exfoliation over harsh scrubs
- You want to improve dull, uneven skin tone
- You're looking for a vegan K-beauty acid treatment
- You want an AHA that doesn't strip moisture
Consider alternatives if:
- You're pregnant or breastfeeding (consult doctor first)
- You have very sensitive or compromised skin barrier
- You're already using strong retinoids or other acids
- You have active eczema, psoriasis, or open wounds
- You need a completely fungal acne-safe formula
- You want daily-use exfoliation (this is 1-3x weekly)
Skin type compatibility
SKIN TYPESLightweight formula controls excess sebum. Succinic acid helps regulate oil production without over-drying.
Lactic acid provides hydration while exfoliating. Follow with a rich moisturizer to prevent any tightness.
Balances well across different face zones. Refines T-zone pores while keeping cheeks hydrated.
Rosemary soothes, but 9% lactic acid may be strong. Start once weekly and patch test first.
Non-comedogenic formula. AHA unclogs pores while succinic acid fights bacteria without irritation.
Results timeline
WEEK 12+Initial Adjustment
Skin may feel slightly tingly during application. Some users notice immediate smoothness the morning after. Minor purging possible if pores were congested.
65% noticed smoother textureVisible Texture Improvement
Skin texture becomes noticeably refined. Makeup applies more smoothly. Pores appear smaller and blackheads start clearing.
78% saw pore improvementRadiant Complexion
Skin tone becomes more even. The "glass skin" effect becomes apparent. Overall brighter, more radiant appearance.
85% reported brighter skinLong-term Benefits
Sustained improvement in skin texture and clarity. Fine lines may appear softer. Skin barrier remains healthy with proper moisturization.
82% would repurchaseRatings by platform
750+ REVIEWSPros & cons
BALANCEDPraised
- Noticeably smoother skin texture within weeks
- Effective pore refinement and blackhead reduction
- Gentle enough for most skin types when used properly
- 100% vegan and cruelty-free formula
- Contains soothing rosemary to offset acid irritation
- Triple hyaluronic acid prevents excessive dryness
- Clean ingredient list with no common irritants
- Glass skin effect with consistent use
Criticized
- Small 30ml bottle size for the price point
- Rosemary scent may be off-putting for some
- Can feel tacky before fully absorbing
- 9% concentration may be too strong for beginners
- Not suitable for daily use (1-3x weekly only)
- Requires sunscreen commitment the next day
- May cause initial purging in congested skin
- Not completely fungal acne safe
Budget-friendly alternatives (dupes)
DUPESHigher lactic acid concentration (10% vs 9%) at a fraction of the price. Lacks the rosemary and succinic acid but includes Tasmanian Pepperberry for soothing. Best budget alternative for basic AHA exfoliation.
Uses 7% Glycolic Acid instead of Lactic Acid - more potent but potentially more irritating. Larger 100ml size offers better value. Different acid profile targets similar concerns.
Western pharmacy-grade formula with glycolic acid. More research-backed but pricier. No botanical soothing agents. Better for those preferring fragrance-free, no-frills formulas.
Comparison with competitors
SIDE-BY-SIDEStorage & shelf life
12 MONTHS12 months after opening
Store in a cool, dry place away from direct sunlight. No refrigeration required but can extend freshness.
Frosted glass dropper bottle - protects formula from light degradation
Yes - 30ml is under 100ml TSA limit for carry-on liquids
Frequently asked questions
FAQUse with caution. This serum contains 9% Lactic Acid, which is higher than the typically recommended 5% or lower concentration for pregnancy. While lactic acid is generally considered one of the safer AHAs during pregnancy, the higher concentration warrants consulting your OB-GYN or dermatologist before use. Many healthcare providers recommend avoiding or limiting AHA use during pregnancy and breastfeeding.
Not completely. While lactic acid itself is fungal acne safe, this formula contains Hydrolyzed Malt Extract, which is a fermented ingredient that may potentially feed Malassezia yeast. If you're prone to fungal acne, you may want to patch test first or consider alternatives like The Ordinary Lactic Acid which has a simpler formula without fermented ingredients.
Not in the same routine. Avoid layering this serum with retinol, vitamin C, or other AHA/BHA products as this can cause over-exfoliation and irritation. If you want to use multiple actives, alternate nights - for example, use this serum on Monday/Wednesday and retinol on Tuesday/Thursday. Always allow your skin barrier to recover between active treatments.
This serum works best for oily, combination, and acne-prone skin types looking to refine pores and improve texture. It's also suitable for dry skin (lactic acid is hydrating) when followed by moisturizer. Those with very sensitive or reactive skin should start slowly with once-weekly application. Not recommended for severely compromised skin barriers.
Most users notice smoother skin texture within 1-2 weeks of consistent use. Visible pore refinement typically occurs around weeks 3-4. The full "glass skin" effect and significant improvement in skin clarity usually develops after 6-8 weeks of regular use (2-3 times weekly). Results vary based on skin type and concerns.
Apply this serum to clean, dry skin after cleansing in your PM routine only. It should be applied before hydrating toners, essences, and moisturizers. Do not use with other active treatments on the same night. Always follow with sunscreen SPF 30+ the next morning, as AHAs increase photosensitivity.
No, this serum has a very low comedogenic rating of 1/5. The water-based formula contains no heavy oils or known pore-clogging ingredients. In fact, the AHA and succinic acid actively help unclog pores by exfoliating dead skin cells and targeting blackheads. It's designed to be non-comedogenic and suitable for acne-prone skin.
The serum has a PAO (Period After Opening) of 12 months. Once opened, use within one year for optimal efficacy. The frosted glass dropper bottle helps protect the formula from light degradation. Store in a cool, dry place away from direct sunlight. If the product changes color, smell, or texture, discontinue use.
Verdict: KAINE Rosemary AHA Night Serum is an impressive K-beauty exfoliant that combines effective 9% Lactic Acid with soothing botanical extracts for a balanced approach to chemical exfoliation. The addition of 7% Rosemary Extract and 0.5% Succinic Acid sets it apart from basic AHA serums, offering anti-inflammatory benefits and gentle blackhead-fighting power. While the 30ml size feels modest for the price, the thoughtful formulation with triple hyaluronic acid makes it gentler than many competitors. Ideal for those seeking smoother, more refined skin without the harshness of glycolic acid. Just be mindful of the pregnancy caution and potential fungal acne concerns from the malt extract.
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.
Just because a product is not free from a common preference does not mean it's a bad product! You can make a personal decision whether or not you want to use a product that contains these ingredients or not - click the labels of the preference to read more about them.
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.
Ingredient Safety Breakdown
Product ingredient list
| EWG | CIR | Ingredient Name & Cosmetic Functions | Notes |
|---|---|---|---|
| 1 |
Water
Solvent, Skin Conditioning
|
|
|
| 0 |
Lactic Acid
|
|
|
| 1 |
Dipropylene Glycol
Fragrance, Solvent, Viscosity Decreasing Agent, Masking, Viscosity Controlling
|
|
|
| 2 |
Glycerin
Solvent, Perfuming, Fragrance, Humectant, Viscosity Decreasing Agent, Hair Conditioning, Skin Protecting, Denaturant, Skin Conditioning
|
Promotes Wound Healing
Hydrating
|
|
| 1 |
Butylene Glycol
Solvent, Skin Conditioning, Masking, Fragrance, Humectant, Viscosity Controlling, Viscositydecreasing Agent
|
Hydrating
|





