1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
Aestura
A-Cica 365 Soothing Relief Serum pH4.5
face serum
Aestura
face serum
Added Last edited
Fit by skin type
General, ingredient-based — not your personalized match.
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Take the skin testThe AESTURA A-Cica 365 Soothing Relief Serum pH4.5 is a calming, barrier-supporting treatment designed to reduce redness, soothe irritation, and rebalance sensitive or acne-prone skin. Formulated at an optimal pH 4.5, this lightweight serum helps maintain the skin’s natural protective environment while strengthening resilience against external stressors. Powered by the A-Cica Complex and centella-derived actives, it delivers targeted relief to compromised or reactive skin.
A-Cica 365 Soothing Relief Serum pH4.5 is a lightweight serum from Aestura, a brand based in Korea. The formula is built mainly around hydration. The ingredient list runs to 32 ingredients, each broken down in full below.
By its ingredient list the formula reads as light: water and humectants lead, with emollients kept lower in the order. Silicones in the formula tend to give a smooth, blurred finish and help it grip under makeup. Hydration is handled by Glycerin, Butylene Glycol and Betaine, humectants that pull water into the upper layers of skin rather than sealing it there.
Hydration: High. Ingredients that pull and hold water in the upper layers of skin, and here that comes from Glycerin, Butylene Glycol, Betaine and Ethylhexylglycerin.
Brightening: Moderate. Ingredients that act on uneven tone and post-inflammatory marks, and here that comes from Niacinamide, 3-o-ethyl Ascorbic Acid and Gluconolactone.
Barrier support: Moderate. Lipids and repair signals that support skin barrier integrity, and here that comes from Niacinamide, Squalane, Hydrogenated Lecithin and Cholesterol.
Soothing: Moderate. Ingredients aimed at visible redness and reactivity, and here that comes from Asiaticoside, Madecassoside, Niacinamide and Madecassic Acid.
On richness alone it suits Balanced, Combination (oily) and Oily skin best, and is the least natural fit for Dry and Combination (dry) skin. Nothing in the list is flagged as a common irritant, which is a reasonable starting point for reactive skin — though a patch test is still the only way to know.
The formula contributes little or nothing on antioxidant protection and firmness signalling. That is not a fault — most products are not meant to do everything — but if one of those is your priority, this is not the product that will address it.
Reading the full list, the formula is fragrance-free, essential-oil-free, no drying alcohol, paraben-free, microplastic-free and sulfate-free. Those claims come from the ingredient list itself, not from the packaging.
It can be used morning and evening. In a routine it goes after toner, before moisturiser. Apply to clean, dry skin and give it a minute to absorb before the next layer. Introduce one new treatment at a time so you can identify what is working.
This summary is generated from the product's ingredient list. It is not a review, it is not the brand's own marketing claims, and it does not replace advice from a dermatologist.
Drawn purely from the ingredient list
Scored on how rich or light the formula reads from its INCI order.
No ingredient in this formula carries a common-irritant flag, making it a reasonable option for reactive skin. A patch test is still recommended, as individual skin reactivity varies.
Based on the curated benefits documented for this product's ingredients.
Attracts and locks in moisture to keep skin plump and dewy
Boosts collagen and cell turnover to reduce fine lines and wrinkles
Calms redness, irritation, and inflammation for sensitive skin
Brightens and balances complexion for a more uniform appearance
Fades hyperpigmentation and evens out dark spots over time
Tightens and refines the look of enlarged pores
None of the ingredients in this formula are associated with these benefits. This is not unusual, as most products are designed to target a limited number of concerns.
The actives, UV filters and benefit-carrying ingredients in this formula, in the order they are listed.
1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
2nd on the list, which puts it at an estimated 5–20% of the formula.
Glycerine ;Glycerol (INN); Glycerol (RIFM); Glycerolum (EP); Glycyl Alcohol; 1,2,3-Propanetriol; 1,2,3-Trihydroxypropane
3rd on the list, which puts it at an estimated 5–20% of the formula.
Butane-1,3-diol (CAS No. 107-88-0/ EC No. 203-529-7) (R)-(-)-butane-1,3-diol” (CAS No. 6290-03-5/ EC No. 228-532-0)
5th on the list, which puts it at an estimated 2–10% of the formula.
Methanaminium, 1-carboxy-N,N,N-trimethyl-, hydroxide, inner salt
6th on the list, which puts it at an estimated 2–10% of the formula.
Niacinamide (vitamin B3) is a gentle skincare active that repairs the skin barrier, calms redness, controls oil and evens tone at 2–5%. Official IUPAC name: **3-Pyridinecarboxamide**
7th on the list, which puts it at an estimated 1–5% of the formula.
D-Glucono-1,5-lactone
11th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sucrose stearate
12th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2,6,10,15,19,23-Hexamethyltetracosane
13th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Lecithins, hydrogenated
14th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2,3-Propanetriol, homopolymer, octadecanoates (1:1) (10 mol glycerol average molar ratio)
17th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,1,1,3,5,5,5-Heptamethyl-3-octyl-trisiloxane
19th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2-Propanediol, 3-(2-ethylhexyloxy)
Each axis is scored from the ingredients present and how high up the list they sit.
Ingredients that pull and hold water in the upper layers of skin
Lipids and repair signals that support skin barrier integrity
Ingredients that mop up free radicals from UV and pollution
Ingredients that moderate sebum or absorb shine
Ingredients that act on uneven tone and post-inflammatory marks
Ingredients aimed at visible redness and reactivity
Retinoids, acids and enzymes that speed surface turnover
Peptides and growth factors that signal for collagen support
"Active" here means an ingredient carrying a recorded active type or a recognised UV filter.
Solvents, emollients, texture agents and preservatives — the formula that carries the actives.
Read from the full ingredient list. A brand's own claim may differ.
Caprylyl Methicone
Judged by the same curated rules our routine checker uses. It reads the ingredients, not the label.
Best kept to separate routines — one in the morning, one at night, or on alternate days.
Can be layered, but the combination raises the irritation risk. Go slowly.
Can be layered, but the combination raises the irritation risk. Go slowly.
Can be layered, but the combination raises the irritation risk. Go slowly.
This product is the "Treat" step.
Flags to check, not verdicts. None of this is medical advice — if you are pregnant, breastfeeding or treating a skin condition, ask a doctor.
Most ingredients do more than one job, so these counts add up to more than the 32 ingredients on the label.
Sets the thickness, spread and stability of the formula
Dissolves and carries everything else
Draws water into the upper layers of skin
Lifts oil and dirt, or holds oil and water together
Changes how skin behaves rather than how it feels
Softens and smooths by filling gaps between skin cells
Binds trace metals that would otherwise spoil the formula
Neutralises free radicals from UV and pollution
Forms a film that slows water loss
Sets the acidity the formula needs to work
Every ingredient on the label, in order, with what it does and roughly how much of it is likely to be there.
1st on the list, which puts it at an estimated 30–80% of the formula.
Aqua (EU),Deionized Water,Distilled Water,Micromatrix Fractile AN,Onsen-Sui (JPN),Purified Water
2nd on the list, which puts it at an estimated 5–20% of the formula.
Glycerine ;Glycerol (INN); Glycerol (RIFM); Glycerolum (EP); Glycyl Alcohol; 1,2,3-Propanetriol; 1,2,3-Trihydroxypropane
3rd on the list, which puts it at an estimated 5–20% of the formula.
Butane-1,3-diol (CAS No. 107-88-0/ EC No. 203-529-7) (R)-(-)-butane-1,3-diol” (CAS No. 6290-03-5/ EC No. 228-532-0)
4th on the list, which puts it at an estimated 2–10% of the formula.
1,1'-Oxydipropan-2-ol; Oxydipropan-2-ol; Hydroxypropyloxypropanol
5th on the list, which puts it at an estimated 2–10% of the formula.
Methanaminium, 1-carboxy-N,N,N-trimethyl-, hydroxide, inner salt
6th on the list, which puts it at an estimated 2–10% of the formula.
Niacinamide (vitamin B3) is a gentle skincare active that repairs the skin barrier, calms redness, controls oil and evens tone at 2–5%. Official IUPAC name: **3-Pyridinecarboxamide**
7th on the list, which puts it at an estimated 1–5% of the formula.
D-Glucono-1,5-lactone
8th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
9th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Butanedioic acid, bis(2-ethoxyethyl) ester
10th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,3-Propanediol, 2-amino-2-(hydroxymethyl)-
11th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sucrose stearate
12th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2,6,10,15,19,23-Hexamethyltetracosane
13th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Lecithins, hydrogenated
14th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2,3-Propanetriol, homopolymer, octadecanoates (1:1) (10 mol glycerol average molar ratio)
15th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2,3-Propanetriol, homopolymer, dodecanoates (1:1) (10 mol glycerol average molar ratio)
16th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
2-Propenoic acid, polymer with 2,2-bis(hydroxymethyl)propane-1,3-diol 2-propenyl ether
17th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,1,1,3,5,5,5-Heptamethyl-3-octyl-trisiloxane
18th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Polyacrylate Crosspolymer-6 is a copolymer of ammonium acryloyldimethyltaurate, dimethylacrylamide, lauryl methacrylate and laureth-4 methacrylate, crosslinked with trimethylolpropane triacrylate
19th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
1,2-Propanediol, 3-(2-ethylhexyloxy)
20th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Cholest-5-en-3-ol (beta)-
21st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Xanthan gum
22nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Urs-12-en-28-oic acid, 2,3,23-trihydroxy-, O-6-deoxy-alpha-L-mannopyranosyl-(1->4)-O-beta-D-glucopyranosyl-(1->6)-beta-D-glucopyranosyl ester (2alpha, 3beta, 4alpha)-
23rd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Urs-12-en-28-oic acid, 2,3,6,23-tetrahydroxy-, (2alpha,3beta,4alpha,6beta)-
24th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
(2.alpha.,3.beta.,4.alpha.)-2,3,23-Trihydroxyurs-12-en-28-oic acid
25th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Hyaluronic acid, sodium, salt
26th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Cellulose, carboxymethyl ether, sodium salt
27th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
3-O-Ethyl Ascorbic Acid is the organic compound.
28th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Proline, 5-oxo-, zinc salt
29th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Sodium gluconate
30th on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Octanoic acid, monoester with glycerol
31st on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
O-6-Deoxy-α-L-mannopyranosyl-(1→4)-O-β-D-glucopyranosyl-(1→6)-β-D-glucopyranosyl (2α,3β,4α,6β)-2,3,6,23-tetrahydroxyurs-12-en-28-oate
32nd on the list, below the 1% line — present at under 1%, which for most ingredients is the level they work at.
Trisodium trimetaphosphate
Products in the same category that share this formula's distinguishing ingredients.
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innisfree
Shares 9 key ingredients with A-Cica 365 Soothing Relief Serum pH4.5: Glycerin, Niacinamide, Betaine, Hydrogenated Lecithin, Butylene Glycol
WATER, GLYCERIN, BUTYLENE GLYCOL, DIPROPYLENE GLYCOL, BETAINE, NIACINAMIDE, GLUCONOLACTONE, 1,2-HEXANEDIOL, DIETHOXYETHYL SUCCINATE, TROMETHAMINE, SUCROSE STEARATE, SQUALANE, HYDROGENATED LECITHIN, POLYGLYCERYL-10 STEARATE, POLYGLYCERYL-10 LAURATE, CARBOMER, CAPRYLYL METHICONE, POLYACRYLATE CROSSPOLYMER-6, ETHYLHEXYLGLYCERIN, CHOLESTEROL, XANTHAN GUM, ASIATICOSIDE, MADECASSIC ACID, ASIATIC ACID, SODIUM HYALURONATE, CELLULOSE GUM, 3-O-ETHYL ASCORBIC ACID, ZINC PCA, SODIUM GLUCONATE, GLYCERYL CAPRYLATE, MADECASSOSIDE, SODIUM TRIMETAPHOSPHATE.
NIACINAMIDE, GLUCONOLACTONE, SODIUM HYALURONATE, 3-O-ETHYL ASCORBIC ACID.
After cleansing and toning, apply 1–2 pumps evenly to the face. Gently pat until fully absorbed, then follow with moisturizer. Use morning and evening.
Judged on how rich the formula reads from its ingredient list, it suits Balanced, Combination (oily), Oily skin best. It is the least natural fit for Dry, Combination (dry) skin.
No ingredient in this formula carries a common-irritant flag, making it a reasonable option for reactive skin. A patch test is still recommended, as individual skin reactivity varies.
4 ingredients could feed malassezia: Sucrose Stearate, Polyglyceryl-10 Stearate, Polyglyceryl-10 Laurate, Glyceryl Caprylate. That describes the yeast's food supply, not a prediction that they will cause a breakout.
Nothing in this formula is on the standard pregnancy-caution list. That is not medical clearance — check anything you use daily with your doctor or midwife.
Yes. Reading the full ingredient list, this formula is fragrance-free.
No. Reading the full ingredient list, this formula is no drying alcohol.
No — it contains Caprylyl Methicone.
No. Reading the full ingredient list, this formula is essential-oil-free.
Yes. Reading the full ingredient list, this formula is paraben-free.
It layers well with Vitamin C (L-ascorbic acid), Benzoyl peroxide, Azelaic acid, Copper peptides, Bakuchiol, Niacinamide. Take more care combining it with Retinoids (retinol, retinal), AHAs (glycolic, lactic), BHA (salicylic acid), PHAs (gluconolactone) — use them in separate routines or on alternate days.
Use it morning and evening, after toner, before moisturiser.
It lists 32 ingredients, of which 4 are recorded as actives.
Aestura, a brand based in Korea.
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