Bye Bye Acne Serum Toner
What it's good for
Key actives from our research database. Click any to read the full evidence dossier.
Also called "cica," it calms redness, repairs the skin barrier, and speeds up recovery. The go-to for irritated or reactive skin.
Good for: Anti-inflammatory, Barrier repair
A fruit-derived AHA that exfoliates and antioxidizes. It shares the same basic mechanism as glycolic and lactic acid but is weaker gram-for-gram; in practice you'll see it doing dual duty (a little exfoliation plus pH stabilisation) in multi-acid toners and serums. When it appears low on an ingredient list, it's adjusting pH; higher up, it's contributing real exfoliation.
Good for: Exfoliating, Antioxidant
A polyphenol from green tea that calms UV-triggered redness and reinforces your sunscreen as a second line of antioxidant defense.
Good for: Antioxidant, Anti-inflammatory, Sun protection
A workhorse hydrator that pulls water into your skin. In nearly every good moisturizer for a reason.
Good for: Hydrating
A calming K-beauty botanical that's also antibacterial, so it pairs well for acne-prone, sensitive skin.
Good for: Anti-inflammatory, Anti-acne
A pure hydrator that holds water in your skin. Makes skin look plumper and smoother almost immediately.
Good for: Hydrating
A "next-gen AHA" that exfoliates and hydrates at the same time, with much less stinging than glycolic. Sensitive-skin or rosacea-prone users tolerate it where stronger acids fail.
Good for: Exfoliating, Hydrating, Antioxidant
A multitasker that calms redness, evens out skin tone, and helps oily skin balance out. One of the safest do-a-little-of-everything ingredients.
Good for: Brightening, Barrier repair, Anti-inflammatory
Pro-vitamin B5. Deeply hydrates and helps repair the skin barrier, calming dry or compromised skin.
Good for: Hydrating, Barrier repair
Goes into your pores and dissolves the oil and dead skin clogging them. Best for blackheads, whiteheads, and oily, acne-prone skin.
Good for: Anti-acne, Exfoliating
Evidence behind the ingredients
Real citations from our research database, one per tracked active in this product. Click any ingredient name to read its full evidence dossier.
Also called "cica," it calms redness, repairs the skin barrier, and speeds up recovery. The go-to for irritated or reactive skin.
Hur N et al., A Randomized, Double-Blind, Placebo-Controlled Trial Assessing the Effects of Oral Centella asiatica Extract on Skin Aging-Related Parameters in Middle-Aged Korean Women, Nutrients 2026
Borowicz KK et al., Geroprotective Potential of Centella asiatica: Modulation of Cellular Aging, Nutrients 2026
Witkowska K et al., Topical Application of Centella asiatica in Wound Healing: Recent Insights into Mechanisms and Clinical Efficacy, Pharmaceutics 2024;16(10):1252 — modern hydrogel and nanostructured Centella delivery systems accelerate wound healing across wound types
A fruit-derived AHA that exfoliates and antioxidizes. It shares the same basic mechanism as glycolic and lactic acid but is weaker gram-for-gram; in practice you'll see it doing dual duty (a little exfoliation plus pH stabilisation) in multi-acid toners and serums. When it appears low on an ingredient list, it's adjusting pH; higher up, it's contributing real exfoliation.
Tang SC, Yang JH. Dual Effects of Alpha-Hydroxy Acids on the Skin. Molecules. 2018;23(4):863.
Yamamoto Y, Uede K, Yonei N, Kishioka A, Ohtani T, Furukawa F. Effects of alpha-hydroxy acids on the human skin of Japanese subjects: the rationale for chemical peeling. Journal of Dermatology. 2006 Jan;33(1):16-22. — Clinical-mechanistic study in Japanese subjects demonstrating AHA (including citric acid class) keratolytic and epidermal renewal effects as rationale for chemical peeling.
Bernstein EF, Underhill CB, Lakkakorpi J, et al. Citric acid increases viable epidermal thickness and glycosaminoglycan content of sun-damaged skin. Dermatologic Surgery. 1997 Aug;23(8):689-694. — Mechanistic study showing topical citric acid increased viable epidermal thickness and dermal glycosaminoglycans in sun-damaged skin, similar to glycolic acid and retinoic acid.
A polyphenol from green tea that calms UV-triggered redness and reinforces your sunscreen as a second line of antioxidant defense.
Detudom P, Kamanamool N, Paichitrojjana A, Udompataikul P, Udompataikul M, Efficacy of anti-sebum moisturizing cream containing 2% l-carnitine and 5% epigallocatechin gallate in seborrhea, Journal of Cosmetic Dermatology 2023;22(11):3058-3064 — Thai RCT showed EGCG-containing cream significantly reduced sebum and improved hydration in seborrhea
Ud-Din S et al., A Double-Blind, Randomized Trial Shows the Role of Zonal Priming and Direct Topical Application of Epigallocatechin-3-Gallate in the Modulation of Cutaneous Scarring in Human Skin, Journal of Investigative Dermatology 2019;139(8):1680-1690 — topical EGCG reduced scar thickness weeks 1-3 and increased elasticity at week 4 vs placebo
Kim YR et al., Clinical Evaluation of a New-Formula Shampoo for Scalp Seborrheic Dermatitis Containing Rosa centifolia + EGCG: A Randomized Double-Blind Controlled Study, Annals of Dermatology 2014;26(6):733-8 — EGCG-containing shampoo matched ketoconazole and zinc pyrithione efficacy; faster erythema response than 1% zinc pyrithione
+−7 more ingredients
A workhorse hydrator that pulls water into your skin. In nearly every good moisturizer for a reason.
Danby SG et al., Different types of emollient cream exhibit diverse physiological effects on the skin barrier in adults with atopic dermatitis, Clinical and Experimental Dermatology 2022;47(6):1154-1164 — glycerol+urea emollient delivered superior barrier-strengthening and irritant protection
Youssef R et al., Glycerol 85% efficacy on atopic skin and its microbiome: a randomized controlled trial, Journal of Dermatological Treatment 2021;32(7):730-736 — topical glycerol 85% RCT on atopic skin
Evans NJ et al., Human axillary skin condition is improved following incorporation of glycerol into the stratum corneum from an antiperspirant formulation, Archives of Dermatological Research 2017;309(9):739-748 — 4% glycerol penetrated axillary SC, reduced irritation, improved hydration
A calming K-beauty botanical that's also antibacterial, so it pairs well for acne-prone, sensitive skin.
Song Z et al., Inhibition of LPS-Induced Skin Inflammatory Response and Barrier Damage via MAPK/NF-kB Signaling Pathway by Houttuynia cordata Thunb Fermentation Broth, Foods 2024
Kwon N et al., Protective Effects of Fermented Houttuynia cordata Against UVA and H2O2-Induced Oxidative Stress in Human Skin Keratinocytes, Applied Biochemistry and Biotechnology 2023;195(5):3027-3046 — Korean-authored; fermented H. cordata showed antioxidant and anti-inflammatory protection against UVA/H2O2 stress
Rafiq S et al., Pharmacological Effects of Houttuynia cordata Thunb (H. cordata): A Comprehensive Review, Pharmaceuticals (Basel) 2022
A pure hydrator that holds water in your skin. Makes skin look plumper and smoother almost immediately.
Karabat MU, Tuncer MC. Effects of hyaluronic acid on skin at the cellular level: a systematic review. Rev Assoc Med Bras. 2025;71(8):e20250208. — Systematic review of 45 studies found low-molecular-weight HA stimulates keratinocyte proliferation and migration while high-molecular-weight HA drives skin hydration, supporting topical HA as an effective skin-hydrating and barrier-supporting ingredient.
Bravo B et al., Benefits of topical hyaluronic acid for skin quality and signs of skin aging: From literature review to clinical evidence, Dermatology and Therapy 2022;12(12):2657-2680 — HA-based cosmeceuticals reliably improve hydration and signs of skin aging
Lee SG et al., Hyaluronan Oligosaccharides Improve Rosacea-Like Phenotype through Anti-Inflammatory and Epidermal Barrier-Improving Effects, Annals of Dermatology 2020
A "next-gen AHA" that exfoliates and hydrates at the same time, with much less stinging than glycolic. Sensitive-skin or rosacea-prone users tolerate it where stronger acids fail.
Warowna M, Strzelecka A, Krecisz B (Poland), Influence of Lactobionic Acid on Hydration and Elasticity Parameters in Women Aged 30-40 and 50-60 Years in Comparison to Mandelic Acid, Journal of Clinical Medicine 2025 — 180-woman trial: 5 lactobionic acid peels improved skin elasticity in both age groups and uniquely raised hydration in the 50-60 group versus mandelic acid
Tasic-Kostov M et al. (Poland), Lactic and lactobionic acids as typically moisturizing compounds, International Journal of Dermatology 2019
Tasic-Kostov M, Lukic M, Savic S (Serbia), A 10% Lactobionic acid-containing moisturizer reduces skin surface pH without irritation - An in vivo/in vitro study, Journal of Cosmetic Dermatology 2019 — in vivo + in vitro study: 10% LA emulsion lowered skin surface pH with satisfactory safety profile; viable AHA alternative for acidifying emollients
A multitasker that calms redness, evens out skin tone, and helps oily skin balance out. One of the safest do-a-little-of-everything ingredients.
Moro F et al., Skin Cancer Prevention and Antiaging: Role of Nicotinamide, International Journal of Molecular Sciences 2026
Passeron T et al., An Investigator-Blinded, Randomized Trial of a Broad-Spectrum Sunscreen Containing Sclareolide and Niacinamide, Dermatology and Therapy (Heidelberg) 2026
Vergilio MM et al., Topical Formulation with Niacinamide Combined with 5 MHz Ultrasound for Improving Skin Ageing, Current Medicinal Chemistry 2025
Pro-vitamin B5. Deeply hydrates and helps repair the skin barrier, calming dry or compromised skin.
Gao Y et al., Evaluation of the Efficacy and Safety of a Panthenol-Enriched Mask for Skin Barrier Recovery After Facial Laser Treatment, Journal of Cosmetic Dermatology 2025;24(7):e70223 — double-blind RCT (n=60): panthenol mask decreased erythema, enhanced hydration, repaired barrier vs saline
Cho YS et al., Use of Dexpanthenol for Atopic Dermatitis-Benefits and Recommendations Based on Current Evidence, Journal of Clinical Medicine 2022;11(14):3943 — Korean-authored review; dexpanthenol improves barrier and reduces severity in mild-to-moderate AD
Heise R et al., Accelerated wound healing with a dexpanthenol-containing ointment after fractional ablative CO2 laser resurfacing of photo-damaged skin in a randomized prospective clinical trial, Cutaneous and Ocular Toxicology 2019;38(3):274-278 — RCT: dexpanthenol significantly faster wound closure vs petroleum jelly post-laser
Goes into your pores and dissolves the oil and dead skin clogging them. Best for blackheads, whiteheads, and oily, acne-prone skin.
Liu Y et al., Clinical Efficacy of a Salicylic Acid-Containing Gel on Acne Management and Skin Barrier Function: A 21-Day Prospective Study, Journal of Cosmetic Dermatology 2025;24(7):e70353 — salicylic acid gel reduced acne lesions, regulated sebum, improved hydration and barrier function
Ye R et al., 2% supramolecular salicylic acid hydrogel vs. adapalene gel in mild to moderate acne vulgaris: multicenter, randomized, evaluator-blind, parallel-controlled trial, Journal of Cosmetic Dermatology 2024;23(6):2125-2134 — 2% SSA hydrogel was equally effective as adapalene gel for mild-to-moderate acne
Brumley C et al. Allergic contact dermatitis to salicylic acid: A case series of relevant sensitization. Contact Dermatitis. 2024;91(2):133-138. doi:10.1111/cod.14573 — Case series of 489 patch-tested patients (2020-2024): 21 positive reactions to salicylic acid. Documents that ACD to SA is likely underreported; testing at 5% concentration feasible.
Sources: 10 clinical journals and regulatory databases across the US, EU, Korea, Japan, and China. Every entry points to a specific document. See methodology for the full list and what each outcome label means.
Layering conflicts
Ingredients in this product that can react with common actives. Avoid stacking unless noted.
- Retinolhigh
Retinol + salicylic acid can over-exfoliate and damage the barrier. Alternate nights.
- Tretinoinhigh
Tretinoin + salicylic acid — major irritation risk. Strict separation required.
- Glycolic Acidmedium
AHA + BHA stacking risks over-exfoliation. Use a pre-formulated AHA/BHA product or alternate days.
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